epan/dissectors/packet-sbas_l1.c

   1 /* packet-sbas_l1.c
   2  * SBAS L1 protocol dissection.
   3  *
   4  * By Timo Warns <timo.warns@gmail.com>
   5  * Copyright 2023 Timo Warns
   6  *
   7  * Wireshark - Network traffic analyzer
   8  * By Gerald Combs <gerald@unicom.net>
   9  * Copyright 1998 Gerald Combs
  10  *
  11  * SPDX-License-Identifier: GPL-2.0-or-later
  12  */
  13
  14 #include "config.h"
  15
  16 #include <epan/expert.h>
  17 #include <epan/packet.h>
  18
  19 #include <epan/tfs.h>
  20 #include <epan/unit_strings.h>
  21
  22 #include <wsutil/array.h>
  23 #include <wsutil/utf8_entities.h>
  24
  25 #include "packet-ubx.h"
  26 #include "packet-sbas_l1.h"
  27
  28 /*
  29  * Dissects navigation messages of the Satellite Based Augmentation System
  30  * (SBAS) sent on L1 frequency as defined by ICAO Annex 10, Vol I.
  31  */
  32
  33 // SBAS L1 preamble values
  34 #define SBAS_L1_PREAMBLE_1 0x53
  35 #define SBAS_L1_PREAMBLE_2 0x9a
  36 #define SBAS_L1_PREAMBLE_3 0xc6
  37
  38 // User Range Accuracy mapping
  39 // see ICAO Annex 10, Vol I, Table B-26
  40 static const value_string URA[] = {
  41     {0,  "2 m"},
  42     {1,  "2.8 m"},
  43     {2,  "4 m"},
  44     {3,  "5.7 m"},
  45     {4,  "8 m"},
  46     {5,  "11.3 m"},
  47     {6,  "16 m"},
  48     {7,  "32 m"},
  49     {8,  "64 m"},
  50     {9,  "128 m"},
  51     {10, "256 m"},
  52     {11, "512 m"},
  53     {12, "1024 m"},
  54     {14, "4096 m"},
  55     {15, "Do Not Use"},
  56     {0, NULL}
  57 };
  58
  59 // SBAS service provider identifier mapping
  60 // see ICAO Annex 10, Vol I, Table B-27
  61 static const value_string SBAS_SPID[] = {
  62     {0, "WAAS"},
  63     {1, "EGNOS"},
  64     {2, "MSAS"},
  65     {0, NULL}
  66 };
  67
  68 // UDREI_i mapping
  69 // see ICAO Annex 10, Vol I, Table B-29
  70 const value_string UDREI_EVALUATION[] = {
  71     {0,  "0.0520 m" UTF8_SUPERSCRIPT_TWO},
  72     {1,  "0.0924 m" UTF8_SUPERSCRIPT_TWO},
  73     {2,  "0.1444 m" UTF8_SUPERSCRIPT_TWO},
  74     {3,  "0.2830 m" UTF8_SUPERSCRIPT_TWO},
  75     {4,  "0.4678 m" UTF8_SUPERSCRIPT_TWO},
  76     {5,  "0.8315 m" UTF8_SUPERSCRIPT_TWO},
  77     {6,  "1.2992 m" UTF8_SUPERSCRIPT_TWO},
  78     {7,  "1.8709 m" UTF8_SUPERSCRIPT_TWO},
  79     {8,  "2.5465 m" UTF8_SUPERSCRIPT_TWO},
  80     {9,  "3.3260 m" UTF8_SUPERSCRIPT_TWO},
  81     {10, "5.1968 m" UTF8_SUPERSCRIPT_TWO},
  82     {11, "20.7870 m" UTF8_SUPERSCRIPT_TWO},
  83     {12, "230.9661 m" UTF8_SUPERSCRIPT_TWO},
  84     {13, "2078.695 m" UTF8_SUPERSCRIPT_TWO},
  85     {14, "Not Monitored"},
  86     {15, "Do Not Use"},
  87     {0,  NULL}
  88 };
  89
  90 // GIVEI_i mapping
  91 // see ICAO Annex 10, Vol I, Table B-33
  92 static const value_string GIVEI_EVALUATION[] = {
  93     {0,  "0.0084 m" UTF8_SUPERSCRIPT_TWO},
  94     {1,  "0.0333 m" UTF8_SUPERSCRIPT_TWO},
  95     {2,  "0.0749 m" UTF8_SUPERSCRIPT_TWO},
  96     {3,  "0.1331 m" UTF8_SUPERSCRIPT_TWO},
  97     {4,  "0.2079 m" UTF8_SUPERSCRIPT_TWO},
  98     {5,  "0.2994 m" UTF8_SUPERSCRIPT_TWO},
  99     {6,  "0.4075 m" UTF8_SUPERSCRIPT_TWO},
 100     {7,  "0.5322 m" UTF8_SUPERSCRIPT_TWO},
 101     {8,  "0.6735 m" UTF8_SUPERSCRIPT_TWO},
 102     {9,  "0.8315 m" UTF8_SUPERSCRIPT_TWO},
 103     {10, "1.1974 m" UTF8_SUPERSCRIPT_TWO},
 104     {11, "1.8709 m" UTF8_SUPERSCRIPT_TWO},
 105     {12, "3.3260 m" UTF8_SUPERSCRIPT_TWO},
 106     {13, "20.787 m" UTF8_SUPERSCRIPT_TWO},
 107     {14, "187.0826 m" UTF8_SUPERSCRIPT_TWO},
 108     {15, "Not Monitored"},
 109     {0,  NULL}
 110 };
 111
 112 // Mapping for fast correction degradation factor
 113 // see ICAO Annex 10, Vol I, Table B-34
 114 static const value_string DEGRADATION_FACTOR_INDICATOR[] = {
 115     {0,  "0.0 mm/s" UTF8_SUPERSCRIPT_TWO},
 116     {1,  "0.05 mm/s" UTF8_SUPERSCRIPT_TWO},
 117     {2,  "0.09 mm/s" UTF8_SUPERSCRIPT_TWO},
 118     {3,  "0.12 mm/s" UTF8_SUPERSCRIPT_TWO},
 119     {4,  "0.15 mm/s" UTF8_SUPERSCRIPT_TWO},
 120     {5,  "0.20 mm/s" UTF8_SUPERSCRIPT_TWO},
 121     {6,  "0.30 mm/s" UTF8_SUPERSCRIPT_TWO},
 122     {7,  "0.45 mm/s" UTF8_SUPERSCRIPT_TWO},
 123     {8,  "0.60 mm/s" UTF8_SUPERSCRIPT_TWO},
 124     {9,  "0.90 mm/s" UTF8_SUPERSCRIPT_TWO},
 125     {10, "1.50 mm/s" UTF8_SUPERSCRIPT_TWO},
 126     {11, "2.10 mm/s" UTF8_SUPERSCRIPT_TWO},
 127     {12, "2.70 mm/s" UTF8_SUPERSCRIPT_TWO},
 128     {13, "3.30 mm/s" UTF8_SUPERSCRIPT_TWO},
 129     {14, "4.60 mm/s" UTF8_SUPERSCRIPT_TWO},
 130     {15, "5.80 mm/s" UTF8_SUPERSCRIPT_TWO},
 131     {0,  NULL}
 132 };
 133
 134 // Mapping for delta UDRE indicator
 135 // see ICAO Annex 10, Vol I, Table B-36
 136 static const value_string DELTA_UDRE_INDICATOR[] = {
 137     {0,  "1"},
 138     {1,  "1.1"},
 139     {2,  "1.25"},
 140     {3,  "1.5"},
 141     {4,  "2"},
 142     {5,  "3"},
 143     {6,  "4"},
 144     {7,  "5"},
 145     {8,  "6"},
 146     {9,  "8"},
 147     {10, "10"},
 148     {11, "20"},
 149     {12, "30"},
 150     {13, "40"},
 151     {14, "50"},
 152     {15, "100"},
 153     {0,  NULL}
 154 };
 155
 156 // Mapping for region shape
 157 // see ICAO Annex 10, Vol I, Section 3.5.4.9
 158 static const val64_string REGION_SHAPE[] = {
 159     {0, "triangle"},
 160     {1, "quadrangle"},
 161     {0,  NULL}
 162 };
 163
 164 // table for SBAS L1 CRC24Q computation
 165 static const uint32_t CRC24Q_TBL[] = {
 166     0x000000, 0x864CFB, 0x8AD50D, 0x0C99F6, 0x93E6E1, 0x15AA1A, 0x1933EC, 0x9F7F17,
 167     0xA18139, 0x27CDC2, 0x2B5434, 0xAD18CF, 0x3267D8, 0xB42B23, 0xB8B2D5, 0x3EFE2E,
 168     0xC54E89, 0x430272, 0x4F9B84, 0xC9D77F, 0x56A868, 0xD0E493, 0xDC7D65, 0x5A319E,
 169     0x64CFB0, 0xE2834B, 0xEE1ABD, 0x685646, 0xF72951, 0x7165AA, 0x7DFC5C, 0xFBB0A7,
 170     0x0CD1E9, 0x8A9D12, 0x8604E4, 0x00481F, 0x9F3708, 0x197BF3, 0x15E205, 0x93AEFE,
 171     0xAD50D0, 0x2B1C2B, 0x2785DD, 0xA1C926, 0x3EB631, 0xB8FACA, 0xB4633C, 0x322FC7,
 172     0xC99F60, 0x4FD39B, 0x434A6D, 0xC50696, 0x5A7981, 0xDC357A, 0xD0AC8C, 0x56E077,
 173     0x681E59, 0xEE52A2, 0xE2CB54, 0x6487AF, 0xFBF8B8, 0x7DB443, 0x712DB5, 0xF7614E,
 174     0x19A3D2, 0x9FEF29, 0x9376DF, 0x153A24, 0x8A4533, 0x0C09C8, 0x00903E, 0x86DCC5,
 175     0xB822EB, 0x3E6E10, 0x32F7E6, 0xB4BB1D, 0x2BC40A, 0xAD88F1, 0xA11107, 0x275DFC,
 176     0xDCED5B, 0x5AA1A0, 0x563856, 0xD074AD, 0x4F0BBA, 0xC94741, 0xC5DEB7, 0x43924C,
 177     0x7D6C62, 0xFB2099, 0xF7B96F, 0x71F594, 0xEE8A83, 0x68C678, 0x645F8E, 0xE21375,
 178     0x15723B, 0x933EC0, 0x9FA736, 0x19EBCD, 0x8694DA, 0x00D821, 0x0C41D7, 0x8A0D2C,
 179     0xB4F302, 0x32BFF9, 0x3E260F, 0xB86AF4, 0x2715E3, 0xA15918, 0xADC0EE, 0x2B8C15,
 180     0xD03CB2, 0x567049, 0x5AE9BF, 0xDCA544, 0x43DA53, 0xC596A8, 0xC90F5E, 0x4F43A5,
 181     0x71BD8B, 0xF7F170, 0xFB6886, 0x7D247D, 0xE25B6A, 0x641791, 0x688E67, 0xEEC29C,
 182     0x3347A4, 0xB50B5F, 0xB992A9, 0x3FDE52, 0xA0A145, 0x26EDBE, 0x2A7448, 0xAC38B3,
 183     0x92C69D, 0x148A66, 0x181390, 0x9E5F6B, 0x01207C, 0x876C87, 0x8BF571, 0x0DB98A,
 184     0xF6092D, 0x7045D6, 0x7CDC20, 0xFA90DB, 0x65EFCC, 0xE3A337, 0xEF3AC1, 0x69763A,
 185     0x578814, 0xD1C4EF, 0xDD5D19, 0x5B11E2, 0xC46EF5, 0x42220E, 0x4EBBF8, 0xC8F703,
 186     0x3F964D, 0xB9DAB6, 0xB54340, 0x330FBB, 0xAC70AC, 0x2A3C57, 0x26A5A1, 0xA0E95A,
 187     0x9E1774, 0x185B8F, 0x14C279, 0x928E82, 0x0DF195, 0x8BBD6E, 0x872498, 0x016863,
 188     0xFAD8C4, 0x7C943F, 0x700DC9, 0xF64132, 0x693E25, 0xEF72DE, 0xE3EB28, 0x65A7D3,
 189     0x5B59FD, 0xDD1506, 0xD18CF0, 0x57C00B, 0xC8BF1C, 0x4EF3E7, 0x426A11, 0xC426EA,
 190     0x2AE476, 0xACA88D, 0xA0317B, 0x267D80, 0xB90297, 0x3F4E6C, 0x33D79A, 0xB59B61,
 191     0x8B654F, 0x0D29B4, 0x01B042, 0x87FCB9, 0x1883AE, 0x9ECF55, 0x9256A3, 0x141A58,
 192     0xEFAAFF, 0x69E604, 0x657FF2, 0xE33309, 0x7C4C1E, 0xFA00E5, 0xF69913, 0x70D5E8,
 193     0x4E2BC6, 0xC8673D, 0xC4FECB, 0x42B230, 0xDDCD27, 0x5B81DC, 0x57182A, 0xD154D1,
 194     0x26359F, 0xA07964, 0xACE092, 0x2AAC69, 0xB5D37E, 0x339F85, 0x3F0673, 0xB94A88,
 195     0x87B4A6, 0x01F85D, 0x0D61AB, 0x8B2D50, 0x145247, 0x921EBC, 0x9E874A, 0x18CBB1,
 196     0xE37B16, 0x6537ED, 0x69AE1B, 0xEFE2E0, 0x709DF7, 0xF6D10C, 0xFA48FA, 0x7C0401,
 197     0x42FA2F, 0xC4B6D4, 0xC82F22, 0x4E63D9, 0xD11CCE, 0x575035, 0x5BC9C3, 0xDD8538
 198 };
 199
 200 /* Initialize the protocol and registered fields */
 201 static int proto_sbas_l1;
 202
 203 // see ICAO Annex 10, Vol I, Appendix B, Section 3.5.3
 204 static int hf_sbas_l1_preamble;
 205 static int hf_sbas_l1_mt;
 206 static int hf_sbas_l1_chksum;
 207
 208 static int hf_sbas_l1_mt0;
 209 static int hf_sbas_l1_mt0_spare_1;
 210 static int hf_sbas_l1_mt0_spare_2;
 211 static int hf_sbas_l1_mt0_spare_3;
 212
 213 // see ICAO Annex 10, Vol I, Table B-38
 214 static int hf_sbas_l1_mt1;
 215 static int hf_sbas_l1_mt1_prn_mask_gps;
 216 static int hf_sbas_l1_mt1_prn_mask_glonass;
 217 static int hf_sbas_l1_mt1_prn_mask_spare_1;
 218 static int hf_sbas_l1_mt1_prn_mask_sbas;
 219 static int hf_sbas_l1_mt1_prn_mask_spare_2;
 220 static int hf_sbas_l1_mt1_iodp;
 221
 222 // see ICAO Annex 10, Vol I, Table B-39
 223 static int hf_sbas_l1_mt2;
 224 static int hf_sbas_l1_mt2_iodf_2;
 225 static int hf_sbas_l1_mt2_iodp;
 226 static int hf_sbas_l1_mt2_fc_1;
 227 static int hf_sbas_l1_mt2_fc_2;
 228 static int hf_sbas_l1_mt2_fc_3;
 229 static int hf_sbas_l1_mt2_fc_4;
 230 static int hf_sbas_l1_mt2_fc_5;
 231 static int hf_sbas_l1_mt2_fc_6;
 232 static int hf_sbas_l1_mt2_fc_7;
 233 static int hf_sbas_l1_mt2_fc_8;
 234 static int hf_sbas_l1_mt2_fc_9;
 235 static int hf_sbas_l1_mt2_fc_10;
 236 static int hf_sbas_l1_mt2_fc_11;
 237 static int hf_sbas_l1_mt2_fc_12;
 238 static int hf_sbas_l1_mt2_fc_13;
 239 static int hf_sbas_l1_mt2_udrei_1;
 240 static int hf_sbas_l1_mt2_udrei_2;
 241 static int hf_sbas_l1_mt2_udrei_3;
 242 static int hf_sbas_l1_mt2_udrei_4;
 243 static int hf_sbas_l1_mt2_udrei_5;
 244 static int hf_sbas_l1_mt2_udrei_6;
 245 static int hf_sbas_l1_mt2_udrei_7;
 246 static int hf_sbas_l1_mt2_udrei_8;
 247 static int hf_sbas_l1_mt2_udrei_9;
 248 static int hf_sbas_l1_mt2_udrei_10;
 249 static int hf_sbas_l1_mt2_udrei_11;
 250 static int hf_sbas_l1_mt2_udrei_12;
 251 static int hf_sbas_l1_mt2_udrei_13;
 252
 253 // see ICAO Annex 10, Vol I, Table B-39
 254 static int hf_sbas_l1_mt3;
 255 static int hf_sbas_l1_mt3_iodf_3;
 256 static int hf_sbas_l1_mt3_iodp;
 257 static int hf_sbas_l1_mt3_fc_14;
 258 static int hf_sbas_l1_mt3_fc_15;
 259 static int hf_sbas_l1_mt3_fc_16;
 260 static int hf_sbas_l1_mt3_fc_17;
 261 static int hf_sbas_l1_mt3_fc_18;
 262 static int hf_sbas_l1_mt3_fc_19;
 263 static int hf_sbas_l1_mt3_fc_20;
 264 static int hf_sbas_l1_mt3_fc_21;
 265 static int hf_sbas_l1_mt3_fc_22;
 266 static int hf_sbas_l1_mt3_fc_23;
 267 static int hf_sbas_l1_mt3_fc_24;
 268 static int hf_sbas_l1_mt3_fc_25;
 269 static int hf_sbas_l1_mt3_fc_26;
 270 static int hf_sbas_l1_mt3_udrei_14;
 271 static int hf_sbas_l1_mt3_udrei_15;
 272 static int hf_sbas_l1_mt3_udrei_16;
 273 static int hf_sbas_l1_mt3_udrei_17;
 274 static int hf_sbas_l1_mt3_udrei_18;
 275 static int hf_sbas_l1_mt3_udrei_19;
 276 static int hf_sbas_l1_mt3_udrei_20;
 277 static int hf_sbas_l1_mt3_udrei_21;
 278 static int hf_sbas_l1_mt3_udrei_22;
 279 static int hf_sbas_l1_mt3_udrei_23;
 280 static int hf_sbas_l1_mt3_udrei_24;
 281 static int hf_sbas_l1_mt3_udrei_25;
 282 static int hf_sbas_l1_mt3_udrei_26;
 283
 284 // see ICAO Annex 10, Vol I, Table B-39
 285 static int hf_sbas_l1_mt4;
 286 static int hf_sbas_l1_mt4_iodf_4;
 287 static int hf_sbas_l1_mt4_iodp;
 288 static int hf_sbas_l1_mt4_fc_27;
 289 static int hf_sbas_l1_mt4_fc_28;
 290 static int hf_sbas_l1_mt4_fc_29;
 291 static int hf_sbas_l1_mt4_fc_30;
 292 static int hf_sbas_l1_mt4_fc_31;
 293 static int hf_sbas_l1_mt4_fc_32;
 294 static int hf_sbas_l1_mt4_fc_33;
 295 static int hf_sbas_l1_mt4_fc_34;
 296 static int hf_sbas_l1_mt4_fc_35;
 297 static int hf_sbas_l1_mt4_fc_36;
 298 static int hf_sbas_l1_mt4_fc_37;
 299 static int hf_sbas_l1_mt4_fc_38;
 300 static int hf_sbas_l1_mt4_fc_39;
 301 static int hf_sbas_l1_mt4_udrei_27;
 302 static int hf_sbas_l1_mt4_udrei_28;
 303 static int hf_sbas_l1_mt4_udrei_29;
 304 static int hf_sbas_l1_mt4_udrei_30;
 305 static int hf_sbas_l1_mt4_udrei_31;
 306 static int hf_sbas_l1_mt4_udrei_32;
 307 static int hf_sbas_l1_mt4_udrei_33;
 308 static int hf_sbas_l1_mt4_udrei_34;
 309 static int hf_sbas_l1_mt4_udrei_35;
 310 static int hf_sbas_l1_mt4_udrei_36;
 311 static int hf_sbas_l1_mt4_udrei_37;
 312 static int hf_sbas_l1_mt4_udrei_38;
 313 static int hf_sbas_l1_mt4_udrei_39;
 314
 315 // see ICAO Annex 10, Vol I, Table B-39
 316 static int hf_sbas_l1_mt5;
 317 static int hf_sbas_l1_mt5_iodf_5;
 318 static int hf_sbas_l1_mt5_iodp;
 319 static int hf_sbas_l1_mt5_fc_40;
 320 static int hf_sbas_l1_mt5_fc_41;
 321 static int hf_sbas_l1_mt5_fc_42;
 322 static int hf_sbas_l1_mt5_fc_43;
 323 static int hf_sbas_l1_mt5_fc_44;
 324 static int hf_sbas_l1_mt5_fc_45;
 325 static int hf_sbas_l1_mt5_fc_46;
 326 static int hf_sbas_l1_mt5_fc_47;
 327 static int hf_sbas_l1_mt5_fc_48;
 328 static int hf_sbas_l1_mt5_fc_49;
 329 static int hf_sbas_l1_mt5_fc_50;
 330 static int hf_sbas_l1_mt5_fc_51;
 331 static int hf_sbas_l1_mt5_fc_52;
 332 static int hf_sbas_l1_mt5_udrei_40;
 333 static int hf_sbas_l1_mt5_udrei_41;
 334 static int hf_sbas_l1_mt5_udrei_42;
 335 static int hf_sbas_l1_mt5_udrei_43;
 336 static int hf_sbas_l1_mt5_udrei_44;
 337 static int hf_sbas_l1_mt5_udrei_45;
 338 static int hf_sbas_l1_mt5_udrei_46;
 339 static int hf_sbas_l1_mt5_udrei_47;
 340 static int hf_sbas_l1_mt5_udrei_48;
 341 static int hf_sbas_l1_mt5_udrei_49;
 342 static int hf_sbas_l1_mt5_udrei_50;
 343 static int hf_sbas_l1_mt5_udrei_51;
 344 static int hf_sbas_l1_mt5_udrei_52;
 345
 346 // see ICAO Annex 10, Vol I, Table B-40
 347 static int hf_sbas_l1_mt6;
 348 static int hf_sbas_l1_mt6_iodf_2;
 349 static int hf_sbas_l1_mt6_iodf_3;
 350 static int hf_sbas_l1_mt6_iodf_4;
 351 static int hf_sbas_l1_mt6_iodf_5;
 352 static int hf_sbas_l1_mt6_udrei_1;
 353 static int hf_sbas_l1_mt6_udrei_2;
 354 static int hf_sbas_l1_mt6_udrei_3;
 355 static int hf_sbas_l1_mt6_udrei_4;
 356 static int hf_sbas_l1_mt6_udrei_5;
 357 static int hf_sbas_l1_mt6_udrei_6;
 358 static int hf_sbas_l1_mt6_udrei_7;
 359 static int hf_sbas_l1_mt6_udrei_8;
 360 static int hf_sbas_l1_mt6_udrei_9;
 361 static int hf_sbas_l1_mt6_udrei_10;
 362 static int hf_sbas_l1_mt6_udrei_11;
 363 static int hf_sbas_l1_mt6_udrei_12;
 364 static int hf_sbas_l1_mt6_udrei_13;
 365 static int hf_sbas_l1_mt6_udrei_14;
 366 static int hf_sbas_l1_mt6_udrei_15;
 367 static int hf_sbas_l1_mt6_udrei_16;
 368 static int hf_sbas_l1_mt6_udrei_17;
 369 static int hf_sbas_l1_mt6_udrei_18;
 370 static int hf_sbas_l1_mt6_udrei_19;
 371 static int hf_sbas_l1_mt6_udrei_20;
 372 static int hf_sbas_l1_mt6_udrei_21;
 373 static int hf_sbas_l1_mt6_udrei_22;
 374 static int hf_sbas_l1_mt6_udrei_23;
 375 static int hf_sbas_l1_mt6_udrei_24;
 376 static int hf_sbas_l1_mt6_udrei_25;
 377 static int hf_sbas_l1_mt6_udrei_26;
 378 static int hf_sbas_l1_mt6_udrei_27;
 379 static int hf_sbas_l1_mt6_udrei_28;
 380 static int hf_sbas_l1_mt6_udrei_29;
 381 static int hf_sbas_l1_mt6_udrei_30;
 382 static int hf_sbas_l1_mt6_udrei_31;
 383 static int hf_sbas_l1_mt6_udrei_32;
 384 static int hf_sbas_l1_mt6_udrei_33;
 385 static int hf_sbas_l1_mt6_udrei_34;
 386 static int hf_sbas_l1_mt6_udrei_35;
 387 static int hf_sbas_l1_mt6_udrei_36;
 388 static int hf_sbas_l1_mt6_udrei_37;
 389 static int hf_sbas_l1_mt6_udrei_38;
 390 static int hf_sbas_l1_mt6_udrei_39;
 391 static int hf_sbas_l1_mt6_udrei_40;
 392 static int hf_sbas_l1_mt6_udrei_41;
 393 static int hf_sbas_l1_mt6_udrei_42;
 394 static int hf_sbas_l1_mt6_udrei_43;
 395 static int hf_sbas_l1_mt6_udrei_44;
 396 static int hf_sbas_l1_mt6_udrei_45;
 397 static int hf_sbas_l1_mt6_udrei_46;
 398 static int hf_sbas_l1_mt6_udrei_47;
 399 static int hf_sbas_l1_mt6_udrei_48;
 400 static int hf_sbas_l1_mt6_udrei_49;
 401 static int hf_sbas_l1_mt6_udrei_50;
 402 static int hf_sbas_l1_mt6_udrei_51;
 403
 404 // see ICAO Annex 10, Vol I, Table B-41
 405 static int hf_sbas_l1_mt7;
 406 static int hf_sbas_l1_mt7_t_lat;
 407 static int hf_sbas_l1_mt7_iodp;
 408 static int hf_sbas_l1_mt7_spare;
 409 static int hf_sbas_l1_mt7_ai_1;
 410 static int hf_sbas_l1_mt7_ai_2;
 411 static int hf_sbas_l1_mt7_ai_3;
 412 static int hf_sbas_l1_mt7_ai_4;
 413 static int hf_sbas_l1_mt7_ai_5;
 414 static int hf_sbas_l1_mt7_ai_6;
 415 static int hf_sbas_l1_mt7_ai_7;
 416 static int hf_sbas_l1_mt7_ai_8;
 417 static int hf_sbas_l1_mt7_ai_9;
 418 static int hf_sbas_l1_mt7_ai_10;
 419 static int hf_sbas_l1_mt7_ai_11;
 420 static int hf_sbas_l1_mt7_ai_12;
 421 static int hf_sbas_l1_mt7_ai_13;
 422 static int hf_sbas_l1_mt7_ai_14;
 423 static int hf_sbas_l1_mt7_ai_15;
 424 static int hf_sbas_l1_mt7_ai_16;
 425 static int hf_sbas_l1_mt7_ai_17;
 426 static int hf_sbas_l1_mt7_ai_18;
 427 static int hf_sbas_l1_mt7_ai_19;
 428 static int hf_sbas_l1_mt7_ai_20;
 429 static int hf_sbas_l1_mt7_ai_21;
 430 static int hf_sbas_l1_mt7_ai_22;
 431 static int hf_sbas_l1_mt7_ai_23;
 432 static int hf_sbas_l1_mt7_ai_24;
 433 static int hf_sbas_l1_mt7_ai_25;
 434 static int hf_sbas_l1_mt7_ai_26;
 435 static int hf_sbas_l1_mt7_ai_27;
 436 static int hf_sbas_l1_mt7_ai_28;
 437 static int hf_sbas_l1_mt7_ai_29;
 438 static int hf_sbas_l1_mt7_ai_30;
 439 static int hf_sbas_l1_mt7_ai_31;
 440 static int hf_sbas_l1_mt7_ai_32;
 441 static int hf_sbas_l1_mt7_ai_33;
 442 static int hf_sbas_l1_mt7_ai_34;
 443 static int hf_sbas_l1_mt7_ai_35;
 444 static int hf_sbas_l1_mt7_ai_36;
 445 static int hf_sbas_l1_mt7_ai_37;
 446 static int hf_sbas_l1_mt7_ai_38;
 447 static int hf_sbas_l1_mt7_ai_39;
 448 static int hf_sbas_l1_mt7_ai_40;
 449 static int hf_sbas_l1_mt7_ai_41;
 450 static int hf_sbas_l1_mt7_ai_42;
 451 static int hf_sbas_l1_mt7_ai_43;
 452 static int hf_sbas_l1_mt7_ai_44;
 453 static int hf_sbas_l1_mt7_ai_45;
 454 static int hf_sbas_l1_mt7_ai_46;
 455 static int hf_sbas_l1_mt7_ai_47;
 456 static int hf_sbas_l1_mt7_ai_48;
 457 static int hf_sbas_l1_mt7_ai_49;
 458 static int hf_sbas_l1_mt7_ai_50;
 459 static int hf_sbas_l1_mt7_ai_51;
 460
 461 // see ICAO Annex 10, Vol I, Table B-42
 462 static int hf_sbas_l1_mt9;
 463 static int hf_sbas_l1_mt9_reserved;
 464 static int hf_sbas_l1_mt9_t_0_geo;
 465 static int hf_sbas_l1_mt9_ura;
 466 static int hf_sbas_l1_mt9_x_g;
 467 static int hf_sbas_l1_mt9_y_g;
 468 static int hf_sbas_l1_mt9_z_g;
 469 static int hf_sbas_l1_mt9_x_g_vel;
 470 static int hf_sbas_l1_mt9_y_g_vel;
 471 static int hf_sbas_l1_mt9_z_g_vel;
 472 static int hf_sbas_l1_mt9_x_g_acc;
 473 static int hf_sbas_l1_mt9_y_g_acc;
 474 static int hf_sbas_l1_mt9_z_g_acc;
 475 static int hf_sbas_l1_mt9_a_gf0;
 476 static int hf_sbas_l1_mt9_a_gf1;
 477
 478 // see ICAO Annex 10, Vol I, Table B-45
 479 static int hf_sbas_l1_mt17;
 480 static int hf_sbas_l1_mt17_reserved;
 481 static int hf_sbas_l1_mt17_prn;
 482 static int hf_sbas_l1_mt17_health_and_status;
 483 static int hf_sbas_l1_mt17_health_and_status_spid;
 484 static int hf_sbas_l1_mt17_health_and_status_spare;
 485 static int hf_sbas_l1_mt17_health_and_status_sat_status_basic_corrections;
 486 static int hf_sbas_l1_mt17_health_and_status_precision_corrections;
 487 static int hf_sbas_l1_mt17_health_and_status_ranging;
 488 static int hf_sbas_l1_mt17_x_ga;
 489 static int hf_sbas_l1_mt17_y_ga;
 490 static int hf_sbas_l1_mt17_z_ga;
 491 static int hf_sbas_l1_mt17_x_ga_vel;
 492 static int hf_sbas_l1_mt17_y_ga_vel;
 493 static int hf_sbas_l1_mt17_z_ga_vel;
 494 static int hf_sbas_l1_mt17_t_a;
 495
 496 static int * const sbas_l1_mt17_health_and_status_fields[] = {
 497     &hf_sbas_l1_mt17_health_and_status_spid,
 498     &hf_sbas_l1_mt17_health_and_status_spare,
 499     &hf_sbas_l1_mt17_health_and_status_sat_status_basic_corrections,
 500     &hf_sbas_l1_mt17_health_and_status_precision_corrections,
 501     &hf_sbas_l1_mt17_health_and_status_ranging,
 502     NULL
 503 };
 504
 505 // see ICAO Annex 10, Vol I, Table B-46
 506 static int hf_sbas_l1_mt18;
 507 static int hf_sbas_l1_mt18_nr_igp_bands;
 508 static int hf_sbas_l1_mt18_igp_band_id;
 509 static int hf_sbas_l1_mt18_iodi_k;
 510 static int hf_sbas_l1_mt18_igp_mask_180w;
 511 static int hf_sbas_l1_mt18_igp_mask_175w;
 512 static int hf_sbas_l1_mt18_igp_mask_170w;
 513 static int hf_sbas_l1_mt18_igp_mask_165w;
 514 static int hf_sbas_l1_mt18_igp_mask_160w;
 515 static int hf_sbas_l1_mt18_igp_mask_155w;
 516 static int hf_sbas_l1_mt18_igp_mask_150w;
 517 static int hf_sbas_l1_mt18_igp_mask_145w;
 518 static int hf_sbas_l1_mt18_igp_mask_140w;
 519 static int hf_sbas_l1_mt18_igp_mask_135w;
 520 static int hf_sbas_l1_mt18_igp_mask_130w;
 521 static int hf_sbas_l1_mt18_igp_mask_125w;
 522 static int hf_sbas_l1_mt18_igp_mask_120w;
 523 static int hf_sbas_l1_mt18_igp_mask_115w;
 524 static int hf_sbas_l1_mt18_igp_mask_110w;
 525 static int hf_sbas_l1_mt18_igp_mask_105w;
 526 static int hf_sbas_l1_mt18_igp_mask_100w;
 527 static int hf_sbas_l1_mt18_igp_mask_95w;
 528 static int hf_sbas_l1_mt18_igp_mask_90w;
 529 static int hf_sbas_l1_mt18_igp_mask_85w;
 530 static int hf_sbas_l1_mt18_igp_mask_80w;
 531 static int hf_sbas_l1_mt18_igp_mask_75w;
 532 static int hf_sbas_l1_mt18_igp_mask_70w;
 533 static int hf_sbas_l1_mt18_igp_mask_65w;
 534 static int hf_sbas_l1_mt18_igp_mask_60w;
 535 static int hf_sbas_l1_mt18_igp_mask_55w;
 536 static int hf_sbas_l1_mt18_igp_mask_50w;
 537 static int hf_sbas_l1_mt18_igp_mask_45w;
 538 static int hf_sbas_l1_mt18_igp_mask_40w;
 539 static int hf_sbas_l1_mt18_igp_mask_35w;
 540 static int hf_sbas_l1_mt18_igp_mask_30w;
 541 static int hf_sbas_l1_mt18_igp_mask_25w;
 542 static int hf_sbas_l1_mt18_igp_mask_20w;
 543 static int hf_sbas_l1_mt18_igp_mask_15w;
 544 static int hf_sbas_l1_mt18_igp_mask_10w;
 545 static int hf_sbas_l1_mt18_igp_mask_5w;
 546 static int hf_sbas_l1_mt18_igp_mask_0;
 547 static int hf_sbas_l1_mt18_igp_mask_5e;
 548 static int hf_sbas_l1_mt18_igp_mask_10e;
 549 static int hf_sbas_l1_mt18_igp_mask_15e;
 550 static int hf_sbas_l1_mt18_igp_mask_20e;
 551 static int hf_sbas_l1_mt18_igp_mask_25e;
 552 static int hf_sbas_l1_mt18_igp_mask_30e;
 553 static int hf_sbas_l1_mt18_igp_mask_35e;
 554 static int hf_sbas_l1_mt18_igp_mask_40e;
 555 static int hf_sbas_l1_mt18_igp_mask_45e;
 556 static int hf_sbas_l1_mt18_igp_mask_50e;
 557 static int hf_sbas_l1_mt18_igp_mask_55e;
 558 static int hf_sbas_l1_mt18_igp_mask_60e;
 559 static int hf_sbas_l1_mt18_igp_mask_65e;
 560 static int hf_sbas_l1_mt18_igp_mask_70e;
 561 static int hf_sbas_l1_mt18_igp_mask_75e;
 562 static int hf_sbas_l1_mt18_igp_mask_80e;
 563 static int hf_sbas_l1_mt18_igp_mask_85e;
 564 static int hf_sbas_l1_mt18_igp_mask_90e;
 565 static int hf_sbas_l1_mt18_igp_mask_95e;
 566 static int hf_sbas_l1_mt18_igp_mask_100e;
 567 static int hf_sbas_l1_mt18_igp_mask_105e;
 568 static int hf_sbas_l1_mt18_igp_mask_110e;
 569 static int hf_sbas_l1_mt18_igp_mask_115e;
 570 static int hf_sbas_l1_mt18_igp_mask_120e;
 571 static int hf_sbas_l1_mt18_igp_mask_125e;
 572 static int hf_sbas_l1_mt18_igp_mask_130e;
 573 static int hf_sbas_l1_mt18_igp_mask_135e;
 574 static int hf_sbas_l1_mt18_igp_mask_140e;
 575 static int hf_sbas_l1_mt18_igp_mask_145e;
 576 static int hf_sbas_l1_mt18_igp_mask_150e;
 577 static int hf_sbas_l1_mt18_igp_mask_155e;
 578 static int hf_sbas_l1_mt18_igp_mask_160e;
 579 static int hf_sbas_l1_mt18_igp_mask_165e;
 580 static int hf_sbas_l1_mt18_igp_mask_170e;
 581 static int hf_sbas_l1_mt18_igp_mask_175e;
 582 static int hf_sbas_l1_mt18_igp_mask_60n_1;
 583 static int hf_sbas_l1_mt18_igp_mask_60n_2;
 584 static int hf_sbas_l1_mt18_igp_mask_65n;
 585 static int hf_sbas_l1_mt18_igp_mask_70n;
 586 static int hf_sbas_l1_mt18_igp_mask_75n;
 587 static int hf_sbas_l1_mt18_igp_mask_85n;
 588 static int hf_sbas_l1_mt18_igp_mask_60s_1;
 589 static int hf_sbas_l1_mt18_igp_mask_60s_2;
 590 static int hf_sbas_l1_mt18_igp_mask_65s;
 591 static int hf_sbas_l1_mt18_igp_mask_70s;
 592 static int hf_sbas_l1_mt18_igp_mask_75s;
 593 static int hf_sbas_l1_mt18_igp_mask_85s;
 594 static int hf_sbas_l1_mt18_spare;
 595
 596 // see ICAO Annex 10, Vol I, Table B-47
 597 static int hf_sbas_l1_mt24;
 598 static int hf_sbas_l1_mt24_fc_i1;
 599 static int hf_sbas_l1_mt24_fc_i2;
 600 static int hf_sbas_l1_mt24_fc_i3;
 601 static int hf_sbas_l1_mt24_fc_i4;
 602 static int hf_sbas_l1_mt24_fc_i5;
 603 static int hf_sbas_l1_mt24_fc_i6;
 604 static int hf_sbas_l1_mt24_udrei_i1;
 605 static int hf_sbas_l1_mt24_udrei_i2;
 606 static int hf_sbas_l1_mt24_udrei_i3;
 607 static int hf_sbas_l1_mt24_udrei_i4;
 608 static int hf_sbas_l1_mt24_udrei_i5;
 609 static int hf_sbas_l1_mt24_udrei_i6;
 610 static int hf_sbas_l1_mt24_iodp;
 611 static int hf_sbas_l1_mt24_fc_type;
 612 static int hf_sbas_l1_mt24_iodf_j;
 613 static int hf_sbas_l1_mt24_spare;
 614 static int hf_sbas_l1_mt24_velocity_code;
 615 static int hf_sbas_l1_mt24_v0_prn_mask_nr_1;
 616 static int hf_sbas_l1_mt24_v0_iod_1;
 617 static int hf_sbas_l1_mt24_v0_delta_x_1;
 618 static int hf_sbas_l1_mt24_v0_delta_y_1;
 619 static int hf_sbas_l1_mt24_v0_delta_z_1;
 620 static int hf_sbas_l1_mt24_v0_delta_a_1_f0;
 621 static int hf_sbas_l1_mt24_v0_prn_mask_nr_2;
 622 static int hf_sbas_l1_mt24_v0_iod_2;
 623 static int hf_sbas_l1_mt24_v0_delta_x_2;
 624 static int hf_sbas_l1_mt24_v0_delta_y_2;
 625 static int hf_sbas_l1_mt24_v0_delta_z_2;
 626 static int hf_sbas_l1_mt24_v0_delta_a_2_f0;
 627 static int hf_sbas_l1_mt24_v0_iodp;
 628 static int hf_sbas_l1_mt24_v0_spare;
 629 static int hf_sbas_l1_mt24_v1_prn_mask_nr;
 630 static int hf_sbas_l1_mt24_v1_iod;
 631 static int hf_sbas_l1_mt24_v1_delta_x;
 632 static int hf_sbas_l1_mt24_v1_delta_y;
 633 static int hf_sbas_l1_mt24_v1_delta_z;
 634 static int hf_sbas_l1_mt24_v1_delta_a_f0;
 635 static int hf_sbas_l1_mt24_v1_delta_x_vel;
 636 static int hf_sbas_l1_mt24_v1_delta_y_vel;
 637 static int hf_sbas_l1_mt24_v1_delta_z_vel;
 638 static int hf_sbas_l1_mt24_v1_delta_a_f1;
 639 static int hf_sbas_l1_mt24_v1_t_lt;
 640 static int hf_sbas_l1_mt24_v1_iodp;
 641
 642 // see ICAO Annex 10, Vol I, Table B-48
 643 static int hf_sbas_l1_mt25;
 644 static int hf_sbas_l1_mt25_h1_velocity_code;
 645 static int hf_sbas_l1_mt25_h1_v0_prn_mask_nr_1;
 646 static int hf_sbas_l1_mt25_h1_v0_iod_1;
 647 static int hf_sbas_l1_mt25_h1_v0_delta_x_1;
 648 static int hf_sbas_l1_mt25_h1_v0_delta_y_1;
 649 static int hf_sbas_l1_mt25_h1_v0_delta_z_1;
 650 static int hf_sbas_l1_mt25_h1_v0_delta_a_1_f0;
 651 static int hf_sbas_l1_mt25_h1_v0_prn_mask_nr_2;
 652 static int hf_sbas_l1_mt25_h1_v0_iod_2;
 653 static int hf_sbas_l1_mt25_h1_v0_delta_x_2;
 654 static int hf_sbas_l1_mt25_h1_v0_delta_y_2;
 655 static int hf_sbas_l1_mt25_h1_v0_delta_z_2;
 656 static int hf_sbas_l1_mt25_h1_v0_delta_a_2_f0;
 657 static int hf_sbas_l1_mt25_h1_v0_iodp;
 658 static int hf_sbas_l1_mt25_h1_v0_spare;
 659 static int hf_sbas_l1_mt25_h1_v1_prn_mask_nr;
 660 static int hf_sbas_l1_mt25_h1_v1_iod;
 661 static int hf_sbas_l1_mt25_h1_v1_delta_x;
 662 static int hf_sbas_l1_mt25_h1_v1_delta_y;
 663 static int hf_sbas_l1_mt25_h1_v1_delta_z;
 664 static int hf_sbas_l1_mt25_h1_v1_delta_a_f0;
 665 static int hf_sbas_l1_mt25_h1_v1_delta_x_vel;
 666 static int hf_sbas_l1_mt25_h1_v1_delta_y_vel;
 667 static int hf_sbas_l1_mt25_h1_v1_delta_z_vel;
 668 static int hf_sbas_l1_mt25_h1_v1_delta_a_f1;
 669 static int hf_sbas_l1_mt25_h1_v1_t_lt;
 670 static int hf_sbas_l1_mt25_h1_v1_iodp;
 671 static int hf_sbas_l1_mt25_h2_velocity_code;
 672 static int hf_sbas_l1_mt25_h2_v0_prn_mask_nr_1;
 673 static int hf_sbas_l1_mt25_h2_v0_iod_1;
 674 static int hf_sbas_l1_mt25_h2_v0_delta_x_1;
 675 static int hf_sbas_l1_mt25_h2_v0_delta_y_1;
 676 static int hf_sbas_l1_mt25_h2_v0_delta_z_1;
 677 static int hf_sbas_l1_mt25_h2_v0_delta_a_1_f0;
 678 static int hf_sbas_l1_mt25_h2_v0_prn_mask_nr_2;
 679 static int hf_sbas_l1_mt25_h2_v0_iod_2;
 680 static int hf_sbas_l1_mt25_h2_v0_delta_x_2;
 681 static int hf_sbas_l1_mt25_h2_v0_delta_y_2;
 682 static int hf_sbas_l1_mt25_h2_v0_delta_z_2;
 683 static int hf_sbas_l1_mt25_h2_v0_delta_a_2_f0;
 684 static int hf_sbas_l1_mt25_h2_v0_iodp;
 685 static int hf_sbas_l1_mt25_h2_v0_spare;
 686 static int hf_sbas_l1_mt25_h2_v1_prn_mask_nr;
 687 static int hf_sbas_l1_mt25_h2_v1_iod;
 688 static int hf_sbas_l1_mt25_h2_v1_delta_x;
 689 static int hf_sbas_l1_mt25_h2_v1_delta_y;
 690 static int hf_sbas_l1_mt25_h2_v1_delta_z;
 691 static int hf_sbas_l1_mt25_h2_v1_delta_a_f0;
 692 static int hf_sbas_l1_mt25_h2_v1_delta_x_vel;
 693 static int hf_sbas_l1_mt25_h2_v1_delta_y_vel;
 694 static int hf_sbas_l1_mt25_h2_v1_delta_z_vel;
 695 static int hf_sbas_l1_mt25_h2_v1_delta_a_f1;
 696 static int hf_sbas_l1_mt25_h2_v1_t_lt;
 697 static int hf_sbas_l1_mt25_h2_v1_iodp;
 698
 699 // see ICAO Annex 10, Vol I, Table B-50
 700 static int hf_sbas_l1_mt26;
 701 static int hf_sbas_l1_mt26_igp_band_id;
 702 static int hf_sbas_l1_mt26_igp_block_id;
 703 static int hf_sbas_l1_mt26_igp_vertical_delay_est_1;
 704 static int hf_sbas_l1_mt26_givei_1;
 705 static int hf_sbas_l1_mt26_igp_vertical_delay_est_2;
 706 static int hf_sbas_l1_mt26_givei_2;
 707 static int hf_sbas_l1_mt26_igp_vertical_delay_est_3;
 708 static int hf_sbas_l1_mt26_givei_3;
 709 static int hf_sbas_l1_mt26_igp_vertical_delay_est_4;
 710 static int hf_sbas_l1_mt26_givei_4;
 711 static int hf_sbas_l1_mt26_igp_vertical_delay_est_5;
 712 static int hf_sbas_l1_mt26_givei_5;
 713 static int hf_sbas_l1_mt26_igp_vertical_delay_est_6;
 714 static int hf_sbas_l1_mt26_givei_6;
 715 static int hf_sbas_l1_mt26_igp_vertical_delay_est_7;
 716 static int hf_sbas_l1_mt26_givei_7;
 717 static int hf_sbas_l1_mt26_igp_vertical_delay_est_8;
 718 static int hf_sbas_l1_mt26_givei_8;
 719 static int hf_sbas_l1_mt26_igp_vertical_delay_est_9;
 720 static int hf_sbas_l1_mt26_givei_9;
 721 static int hf_sbas_l1_mt26_igp_vertical_delay_est_10;
 722 static int hf_sbas_l1_mt26_givei_10;
 723 static int hf_sbas_l1_mt26_igp_vertical_delay_est_11;
 724 static int hf_sbas_l1_mt26_givei_11;
 725 static int hf_sbas_l1_mt26_igp_vertical_delay_est_12;
 726 static int hf_sbas_l1_mt26_givei_12;
 727 static int hf_sbas_l1_mt26_igp_vertical_delay_est_13;
 728 static int hf_sbas_l1_mt26_givei_13;
 729 static int hf_sbas_l1_mt26_igp_vertical_delay_est_14;
 730 static int hf_sbas_l1_mt26_givei_14;
 731 static int hf_sbas_l1_mt26_igp_vertical_delay_est_15;
 732 static int hf_sbas_l1_mt26_givei_15;
 733 static int hf_sbas_l1_mt26_iodi_k;
 734 static int hf_sbas_l1_mt26_spare;
 735
 736 // see ICAO Annex 10, Vol I, Table B-51
 737 static int hf_sbas_l1_mt27;
 738 static int hf_sbas_l1_mt27_iods;
 739 static int hf_sbas_l1_mt27_num_svc_msgs;
 740 static int hf_sbas_l1_mt27_svc_msg_num;
 741 static int hf_sbas_l1_mt27_num_regions;
 742 static int hf_sbas_l1_mt27_prio_code;
 743 static int hf_sbas_l1_mt27_dudre_in;
 744 static int hf_sbas_l1_mt27_dudre_out;
 745 static int hf_sbas_l1_mt27_region[5];
 746 static int hf_sbas_l1_mt27_region_c1_lat[5];
 747 static int hf_sbas_l1_mt27_region_c1_lon[5];
 748 static int hf_sbas_l1_mt27_region_c2_lat[5];
 749 static int hf_sbas_l1_mt27_region_c2_lon[5];
 750 static int hf_sbas_l1_mt27_region_shape[5];
 751 static int hf_sbas_l1_mt27_spare;
 752
 753 static int * const sbas_l1_mt27_region_fields[][6] = {
 754     {
 755         &hf_sbas_l1_mt27_region_c1_lat[0],
 756         &hf_sbas_l1_mt27_region_c1_lon[0],
 757         &hf_sbas_l1_mt27_region_c2_lat[0],
 758         &hf_sbas_l1_mt27_region_c2_lon[0],
 759         &hf_sbas_l1_mt27_region_shape[0],
 760         NULL
 761     },
 762     {
 763         &hf_sbas_l1_mt27_region_c1_lat[1],
 764         &hf_sbas_l1_mt27_region_c1_lon[1],
 765         &hf_sbas_l1_mt27_region_c2_lat[1],
 766         &hf_sbas_l1_mt27_region_c2_lon[1],
 767         &hf_sbas_l1_mt27_region_shape[1],
 768         NULL
 769     },
 770     {
 771         &hf_sbas_l1_mt27_region_c1_lat[2],
 772         &hf_sbas_l1_mt27_region_c1_lon[2],
 773         &hf_sbas_l1_mt27_region_c2_lat[2],
 774         &hf_sbas_l1_mt27_region_c2_lon[2],
 775         &hf_sbas_l1_mt27_region_shape[2],
 776         NULL
 777     },
 778     {
 779         &hf_sbas_l1_mt27_region_c1_lat[3],
 780         &hf_sbas_l1_mt27_region_c1_lon[3],
 781         &hf_sbas_l1_mt27_region_c2_lat[3],
 782         &hf_sbas_l1_mt27_region_c2_lon[3],
 783         &hf_sbas_l1_mt27_region_shape[3],
 784         NULL
 785     },
 786     {
 787         &hf_sbas_l1_mt27_region_c1_lat[4],
 788         &hf_sbas_l1_mt27_region_c1_lon[4],
 789         &hf_sbas_l1_mt27_region_c2_lat[4],
 790         &hf_sbas_l1_mt27_region_c2_lon[4],
 791         &hf_sbas_l1_mt27_region_shape[4],
 792         NULL
 793     },
 794 };
 795
 796 // see ICAO Annex 10, Vol I, Table B-52
 797 static int hf_sbas_l1_mt63;
 798 static int hf_sbas_l1_mt63_spare_1;
 799 static int hf_sbas_l1_mt63_spare_2;
 800 static int hf_sbas_l1_mt63_spare_3;
 801
 802 static dissector_table_t sbas_l1_mt_dissector_table;
 803
 804 static expert_field ei_sbas_l1_preamble;
 805 static expert_field ei_sbas_l1_mt0;
 806 static expert_field ei_sbas_l1_crc;
 807 static expert_field ei_sbas_l1_mt26_igp_band_id;
 808 static expert_field ei_sbas_l1_mt26_igp_block_id;
 809
 810 static int ett_sbas_l1;
 811 static int ett_sbas_l1_mt0;
 812 static int ett_sbas_l1_mt1;
 813 static int ett_sbas_l1_mt2;
 814 static int ett_sbas_l1_mt3;
 815 static int ett_sbas_l1_mt4;
 816 static int ett_sbas_l1_mt5;
 817 static int ett_sbas_l1_mt6;
 818 static int ett_sbas_l1_mt7;
 819 static int ett_sbas_l1_mt9;
 820 static int ett_sbas_l1_mt17;
 821 static int ett_sbas_l1_mt17_prn_data[3];
 822 static int ett_sbas_l1_mt17_health_and_status;
 823 static int ett_sbas_l1_mt18;
 824 static int ett_sbas_l1_mt24;
 825 static int ett_sbas_l1_mt25;
 826 static int ett_sbas_l1_mt26;
 827 static int ett_sbas_l1_mt27;
 828 static int ett_sbas_l1_mt27_region[5];
 829 static int ett_sbas_l1_mt63;
 830
 831 // compute the CRC24Q checksum for an SBAS L1 nav msg
 832 // see ICAO Annex 10, Vol I, Appendix B, Section 3.5.3.5
 833 static uint32_t sbas_crc24q(const uint8_t *data) {
 834     uint32_t crc = 0;
 835
 836     // source byte and bit level index
 837     int s8 = 0, s1 = 7;
 838
 839     uint8_t s,d = 0;
 840
 841     // At byte level, nav msg needs to be right aligned.
 842     // So, pretend that 6 bits (with value zero) have been processed.
 843     uint8_t d1 = 6;
 844
 845     // process 226 bits nav msg (= 28 bytes + 2 bits)
 846     while ((s8 < 28) || (s8 == 28 && s1 > 5)) {
 847
 848         // get next bit from nav msg
 849         s = (data[s8] >> s1) & 0x01;
 850
 851         // include next bit
 852         d = (d << 1) ^ s;
 853
 854         // 8 bits included?
 855         if (d1 == 7) {
 856             // do crc update
 857             crc=((crc<<8) & 0xffffff) ^ CRC24Q_TBL[(crc>>16) ^ d];
 858
 859             d1 = 0;
 860         }
 861         else {
 862             d1++;
 863         }
 864
 865         // move to next byte if the last bit of current one was processed.
 866         if (s1 == 0) {
 867             s8++;
 868             s1 = 7;
 869         }
 870         else {
 871             s1--;
 872         }
 873     }
 874
 875     return crc;
 876 }
 877
 878 /* Format GEO position (X or Y axis) with 2600m resolution */
 879 static void fmt_geo_xy_position(char *label, int32_t c) {
 880     snprintf(label, ITEM_LABEL_LENGTH, "%d m", c * 2600);
 881 }
 882
 883 /* Format GEO position (X or Y axis) with 0.08m resolution */
 884 static void fmt_geo_xy_position2(char *label, int64_t c) {
 885     c = c * 8;
 886     if (c >= 0) {
 887         snprintf(label, ITEM_LABEL_LENGTH, "%" PRId64 ".%02" PRId64 "m", c / 100, c % 100);
 888     }
 889     else {
 890         snprintf(label, ITEM_LABEL_LENGTH, "-%" PRId64 ".%02" PRId64 "m", -c / 100, -c % 100);
 891     }
 892 }
 893
 894 /* Format GEO position (Z axis) with 26000m resolution */
 895 static void fmt_geo_z_position(char *label, int32_t c) {
 896     snprintf(label, ITEM_LABEL_LENGTH, "%d m", c * 26000);
 897 }
 898
 899 /* Format GEO position (z axis) with 0.4m resolution */
 900 static void fmt_geo_z_position2(char *label, int64_t c) {
 901     c = c * 4;
 902     if (c >= 0) {
 903         snprintf(label, ITEM_LABEL_LENGTH, "%" PRId64 ".%01" PRId64 "m", c / 10, c % 10);
 904     }
 905     else {
 906         snprintf(label, ITEM_LABEL_LENGTH, "-%" PRId64 ".%01" PRId64 "m", -c / 10, -c % 10);
 907     }
 908 }
 909
 910 /* Format GEO velocity (X or Y axis) with 10m/s resolution */
 911 static void fmt_geo_xy_velocity(char *label, int32_t c) {
 912     snprintf(label, ITEM_LABEL_LENGTH, "%d m/s", c * 10);
 913 }
 914
 915 /* Format GEO velocity (X or Y axis) with 0.000625m/s resolution */
 916 static void fmt_geo_xy_velocity2(char *label, int32_t c) {
 917     c = c * 625;
 918     if (c >= 0) {
 919         snprintf(label, ITEM_LABEL_LENGTH, "%d.%06d m/s", c / 1000000, c % 1000000);
 920     }
 921     else {
 922         snprintf(label, ITEM_LABEL_LENGTH, "-%d.%06d m/s", -c / 1000000, -c % 1000000);
 923     }
 924 }
 925
 926 /* Format GEO velocity (Z axis) with 60m/s resolution */
 927 static void fmt_geo_z_velocity(char *label, int32_t c) {
 928     snprintf(label, ITEM_LABEL_LENGTH, "%d m/s", c * 60);
 929 }
 930
 931 /* Format GEO velocity (Z axis) with 0.004m/s resolution */
 932 static void fmt_geo_z_velocity2(char *label, int32_t c) {
 933     c = c * 4;
 934     if (c >= 0) {
 935         snprintf(label, ITEM_LABEL_LENGTH, "%d.%03d m/s", c / 1000, c % 1000);
 936     }
 937     else {
 938         snprintf(label, ITEM_LABEL_LENGTH, "-%d.%03d m/s", -c / 1000, -c % 1000);
 939     }
 940 }
 941
 942 /* Format GEO acceleration (X or Y axis) with 0.0000125m/s^2 resolution */
 943 static void fmt_geo_xy_acceleration(char *label, int32_t c) {
 944     c = c * 125;
 945     if (c >= 0) {
 946         snprintf(label, ITEM_LABEL_LENGTH, "%d.%07d m/s", c / 10000000, c % 10000000);
 947     }
 948     else {
 949         snprintf(label, ITEM_LABEL_LENGTH, "-%d.%07d m/s", -c / 10000000, -c % 10000000);
 950     }
 951 }
 952
 953 /* Format GEO acceleration (Z axis) with 0.0000625m/s^2 resolution */
 954 static void fmt_geo_z_acceleration(char *label, int32_t c) {
 955     c = c * 625;
 956     if (c >= 0) {
 957         snprintf(label, ITEM_LABEL_LENGTH, "%d.%07d m/s", c / 10000000, c % 10000000);
 958     }
 959     else {
 960         snprintf(label, ITEM_LABEL_LENGTH, "-%d.%07d m/s", -c / 10000000, -c % 10000000);
 961     }
 962 }
 963
 964 /* Format time of almanac with 64s resolution */
 965 static void fmt_time_of_almanac(char *label, uint32_t c) {
 966     c = c * 64;
 967     snprintf(label, ITEM_LABEL_LENGTH, "%us (%02u:%02u:%02u)", c, c / 3600, (c / 60) % 60, c % 60);
 968 }
 969
 970 /* Format clock corrections */
 971 static void fmt_clock_correction(char *label, int32_t c) {
 972     snprintf(label, ITEM_LABEL_LENGTH, "%d * 2^-31 s", c);
 973 }
 974
 975 /* Format corrections with 0.125m resolution */
 976 static void fmt_correction_125m(char *label, int32_t c) {
 977     c = c * 125;
 978     if (c >= 0) {
 979         snprintf(label, ITEM_LABEL_LENGTH, "%d.%03dm", c / 1000, c % 1000);
 980     }
 981     else {
 982         snprintf(label, ITEM_LABEL_LENGTH, "-%d.%03dm", -c / 1000, -c % 1000);
 983     }
 984 }
 985
 986 /* Format velocity corrections with 2^-11 m/s resolution */
 987 static void fmt_velo_correction(char *label, int32_t c) {
 988     int64_t temp = c * INT64_C(48828125);
 989     if (c >= 0) {
 990         snprintf(label, ITEM_LABEL_LENGTH, " %" PRId64 ".%011" PRId64 "m/s", temp / 100000000000, temp % 100000000000);
 991     }
 992     else {
 993         snprintf(label, ITEM_LABEL_LENGTH, "-%" PRId64 ".%011" PRId64 "m/s", -temp / 100000000000, -temp % 100000000000);
 994     }
 995 }
 996
 997 /* Format clock rate corrections with 2^-39 s/s resolution */
 998 static void fmt_clk_rate_correction(char *label, int32_t c) {
 999     snprintf(label, ITEM_LABEL_LENGTH, "%d * 2^-39s/s", c);
1000 }
1001
1002 /* Format clock rate corrections with 2^-40 s/s resolution */
1003 static void fmt_clk_rate_correction2(char *label, int32_t c) {
1004     snprintf(label, ITEM_LABEL_LENGTH, "%d * 2^-40s/s", c);
1005 }
1006
1007 /* Format time of applicability with 16s resolution */
1008 static void fmt_time_of_applicability(char *label, uint32_t c) {
1009     c = c * 16;
1010     snprintf(label, ITEM_LABEL_LENGTH, "%us (%02u:%02u:%02u)", c, c / 3600, (c / 60) % 60, c % 60);
1011 }
1012
1013 /* Format MT27 service message number data */
1014 static void fmt_num_svc_msg(char *label, uint32_t c) {
1015     c = c + 1;
1016     snprintf(label, ITEM_LABEL_LENGTH, "%u", c);
1017 }
1018
1019 /* Dissect SBAS L1 message */
1020 static int dissect_sbas_l1(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void *data _U_) {
1021     tvbuff_t *next_tvb;
1022     uint32_t preamble, mt, cmp_crc;
1023
1024     col_set_str(pinfo->cinfo, COL_PROTOCOL, "SBAS L1");
1025     col_clear(pinfo->cinfo, COL_INFO);
1026
1027     proto_item *ti = proto_tree_add_item(tree, proto_sbas_l1, tvb, 0, 32, ENC_NA);
1028     proto_tree *sbas_l1_tree = proto_item_add_subtree(ti, ett_sbas_l1);
1029
1030     // preamble
1031     proto_item* pi_preamble = proto_tree_add_item_ret_uint(
1032             sbas_l1_tree, hf_sbas_l1_preamble,
1033             tvb, 0, 1, ENC_BIG_ENDIAN,
1034             &preamble);
1035     if (preamble != SBAS_L1_PREAMBLE_1 &&
1036             preamble != SBAS_L1_PREAMBLE_2 &&
1037             preamble != SBAS_L1_PREAMBLE_3) {
1038         expert_add_info_format(pinfo, pi_preamble, &ei_sbas_l1_preamble,
1039                 "Erroneous preamble");
1040     }
1041
1042     // message type
1043     proto_item* pi_mt = proto_tree_add_item_ret_uint(
1044             sbas_l1_tree, hf_sbas_l1_mt,
1045             tvb, 1, 1, ENC_BIG_ENDIAN,
1046             &mt);
1047     if (mt == 0) { // flag "Do Not Use" MT0 messages
1048         expert_add_info(pinfo, pi_mt, &ei_sbas_l1_mt0);
1049     }
1050
1051     // checksum
1052     cmp_crc = sbas_crc24q((uint8_t *)tvb_memdup(pinfo->pool, tvb, 0, 29));
1053     proto_tree_add_checksum(sbas_l1_tree, tvb, 28, hf_sbas_l1_chksum, -1,
1054             &ei_sbas_l1_crc, NULL, cmp_crc, ENC_BIG_ENDIAN, PROTO_CHECKSUM_VERIFY);
1055
1056     // try to dissect MT data
1057     next_tvb = tvb_new_subset_length(tvb, 1, 28);
1058     if (!dissector_try_uint(sbas_l1_mt_dissector_table, mt, next_tvb, pinfo, tree)) {
1059         call_data_dissector(next_tvb, pinfo, tree);
1060     }
1061
1062     return tvb_captured_length(tvb);
1063 }
1064
1065 /* Dissect SBAS L1 MT 0 */
1066 static int dissect_sbas_l1_mt0(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void *data _U_) {
1067     col_set_str(pinfo->cinfo, COL_PROTOCOL, "SBAS L1 MT0");
1068     col_clear(pinfo->cinfo, COL_INFO);
1069
1070     proto_item *ti = proto_tree_add_item(tree, hf_sbas_l1_mt0, tvb, 0, 32, ENC_NA);
1071     proto_tree *sbas_l1_mt0_tree = proto_item_add_subtree(ti, ett_sbas_l1_mt0);
1072
1073     proto_tree_add_item(sbas_l1_mt0_tree, hf_sbas_l1_mt0_spare_1, tvb,  0,  1, ENC_NA);
1074     proto_tree_add_item(sbas_l1_mt0_tree, hf_sbas_l1_mt0_spare_2, tvb,  1, 26, ENC_NA);
1075     proto_tree_add_item(sbas_l1_mt0_tree, hf_sbas_l1_mt0_spare_3, tvb, 27,  1, ENC_NA);
1076
1077     return tvb_captured_length(tvb);
1078 }
1079
1080 /* Dissect SBAS L1 MT 1 */
1081 static int dissect_sbas_l1_mt1(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void *data _U_) {
1082     col_set_str(pinfo->cinfo, COL_PROTOCOL, "SBAS L1 MT1");
1083     col_clear(pinfo->cinfo, COL_INFO);
1084
1085     proto_item *ti = proto_tree_add_item(tree, hf_sbas_l1_mt1, tvb, 0, 32, ENC_NA);
1086     proto_tree *sbas_l1_mt1_tree = proto_item_add_subtree(ti, ett_sbas_l1_mt1);
1087
1088     proto_tree_add_item(sbas_l1_mt1_tree, hf_sbas_l1_mt1_prn_mask_gps,     tvb, 0,  8, ENC_BIG_ENDIAN);
1089     proto_tree_add_item(sbas_l1_mt1_tree, hf_sbas_l1_mt1_prn_mask_glonass, tvb, 5,  8, ENC_BIG_ENDIAN);
1090     proto_tree_add_item(sbas_l1_mt1_tree, hf_sbas_l1_mt1_prn_mask_spare_1, tvb, 8,  8, ENC_BIG_ENDIAN);
1091     proto_tree_add_item(sbas_l1_mt1_tree, hf_sbas_l1_mt1_prn_mask_sbas,    tvb, 15, 8, ENC_BIG_ENDIAN);
1092     proto_tree_add_item(sbas_l1_mt1_tree, hf_sbas_l1_mt1_prn_mask_spare_2, tvb, 20, 8, ENC_BIG_ENDIAN);
1093     proto_tree_add_item(sbas_l1_mt1_tree, hf_sbas_l1_mt1_iodp,             tvb, 27, 1, ENC_NA);
1094
1095     return tvb_captured_length(tvb);
1096 }
1097
1098 /* Dissect SBAS L1 MT 2 */
1099 static int dissect_sbas_l1_mt2(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void *data _U_) {
1100     col_set_str(pinfo->cinfo, COL_PROTOCOL, "SBAS L1 MT2");
1101     col_clear(pinfo->cinfo, COL_INFO);
1102
1103     proto_item *ti = proto_tree_add_item(tree, hf_sbas_l1_mt2, tvb, 0, 32, ENC_NA);
1104     proto_tree *sbas_l1_mt2_tree = proto_item_add_subtree(ti, ett_sbas_l1_mt2);
1105
1106     proto_tree_add_item(sbas_l1_mt2_tree, hf_sbas_l1_mt2_iodf_2,   tvb, 0,  1, ENC_NA);
1107     proto_tree_add_item(sbas_l1_mt2_tree, hf_sbas_l1_mt2_iodp,     tvb, 1,  1, ENC_NA);
1108     proto_tree_add_item(sbas_l1_mt2_tree, hf_sbas_l1_mt2_fc_1,     tvb, 1,  4, ENC_BIG_ENDIAN);
1109     proto_tree_add_item(sbas_l1_mt2_tree, hf_sbas_l1_mt2_fc_2,     tvb, 2,  4, ENC_BIG_ENDIAN);
1110     proto_tree_add_item(sbas_l1_mt2_tree, hf_sbas_l1_mt2_fc_3,     tvb, 4,  4, ENC_BIG_ENDIAN);
1111     proto_tree_add_item(sbas_l1_mt2_tree, hf_sbas_l1_mt2_fc_4,     tvb, 5,  4, ENC_BIG_ENDIAN);
1112     proto_tree_add_item(sbas_l1_mt2_tree, hf_sbas_l1_mt2_fc_5,     tvb, 7,  4, ENC_BIG_ENDIAN);
1113     proto_tree_add_item(sbas_l1_mt2_tree, hf_sbas_l1_mt2_fc_6,     tvb, 8,  4, ENC_BIG_ENDIAN);
1114     proto_tree_add_item(sbas_l1_mt2_tree, hf_sbas_l1_mt2_fc_7,     tvb, 10, 4, ENC_BIG_ENDIAN);
1115     proto_tree_add_item(sbas_l1_mt2_tree, hf_sbas_l1_mt2_fc_8,     tvb, 11, 4, ENC_BIG_ENDIAN);
1116     proto_tree_add_item(sbas_l1_mt2_tree, hf_sbas_l1_mt2_fc_9,     tvb, 13, 4, ENC_BIG_ENDIAN);
1117     proto_tree_add_item(sbas_l1_mt2_tree, hf_sbas_l1_mt2_fc_10,    tvb, 14, 4, ENC_BIG_ENDIAN);
1118     proto_tree_add_item(sbas_l1_mt2_tree, hf_sbas_l1_mt2_fc_11,    tvb, 16, 4, ENC_BIG_ENDIAN);
1119     proto_tree_add_item(sbas_l1_mt2_tree, hf_sbas_l1_mt2_fc_12,    tvb, 17, 4, ENC_BIG_ENDIAN);
1120     proto_tree_add_item(sbas_l1_mt2_tree, hf_sbas_l1_mt2_fc_13,    tvb, 19, 4, ENC_BIG_ENDIAN);
1121     proto_tree_add_item(sbas_l1_mt2_tree, hf_sbas_l1_mt2_udrei_1,  tvb, 20, 2, ENC_BIG_ENDIAN);
1122     proto_tree_add_item(sbas_l1_mt2_tree, hf_sbas_l1_mt2_udrei_2,  tvb, 21, 2, ENC_BIG_ENDIAN);
1123     proto_tree_add_item(sbas_l1_mt2_tree, hf_sbas_l1_mt2_udrei_3,  tvb, 21, 2, ENC_BIG_ENDIAN);
1124     proto_tree_add_item(sbas_l1_mt2_tree, hf_sbas_l1_mt2_udrei_4,  tvb, 22, 2, ENC_BIG_ENDIAN);
1125     proto_tree_add_item(sbas_l1_mt2_tree, hf_sbas_l1_mt2_udrei_5,  tvb, 22, 2, ENC_BIG_ENDIAN);
1126     proto_tree_add_item(sbas_l1_mt2_tree, hf_sbas_l1_mt2_udrei_6,  tvb, 23, 2, ENC_BIG_ENDIAN);
1127     proto_tree_add_item(sbas_l1_mt2_tree, hf_sbas_l1_mt2_udrei_7,  tvb, 23, 2, ENC_BIG_ENDIAN);
1128     proto_tree_add_item(sbas_l1_mt2_tree, hf_sbas_l1_mt2_udrei_8,  tvb, 24, 2, ENC_BIG_ENDIAN);
1129     proto_tree_add_item(sbas_l1_mt2_tree, hf_sbas_l1_mt2_udrei_9,  tvb, 24, 2, ENC_BIG_ENDIAN);
1130     proto_tree_add_item(sbas_l1_mt2_tree, hf_sbas_l1_mt2_udrei_10, tvb, 25, 2, ENC_BIG_ENDIAN);
1131     proto_tree_add_item(sbas_l1_mt2_tree, hf_sbas_l1_mt2_udrei_11, tvb, 25, 2, ENC_BIG_ENDIAN);
1132     proto_tree_add_item(sbas_l1_mt2_tree, hf_sbas_l1_mt2_udrei_12, tvb, 26, 2, ENC_BIG_ENDIAN);
1133     proto_tree_add_item(sbas_l1_mt2_tree, hf_sbas_l1_mt2_udrei_13, tvb, 26, 2, ENC_BIG_ENDIAN);
1134
1135     return tvb_captured_length(tvb);
1136 }
1137
1138 /* Dissect SBAS L1 MT 3 */
1139 static int dissect_sbas_l1_mt3(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void *data _U_) {
1140     col_set_str(pinfo->cinfo, COL_PROTOCOL, "SBAS L1 MT3");
1141     col_clear(pinfo->cinfo, COL_INFO);
1142
1143     proto_item *ti = proto_tree_add_item(tree, hf_sbas_l1_mt3, tvb, 0, 32, ENC_NA);
1144     proto_tree *sbas_l1_mt3_tree = proto_item_add_subtree(ti, ett_sbas_l1_mt3);
1145
1146     proto_tree_add_item(sbas_l1_mt3_tree, hf_sbas_l1_mt3_iodf_3,   tvb, 0,  1, ENC_NA);
1147     proto_tree_add_item(sbas_l1_mt3_tree, hf_sbas_l1_mt3_iodp,     tvb, 1,  1, ENC_NA);
1148     proto_tree_add_item(sbas_l1_mt3_tree, hf_sbas_l1_mt3_fc_14,    tvb, 1,  4, ENC_BIG_ENDIAN);
1149     proto_tree_add_item(sbas_l1_mt3_tree, hf_sbas_l1_mt3_fc_15,    tvb, 2,  4, ENC_BIG_ENDIAN);
1150     proto_tree_add_item(sbas_l1_mt3_tree, hf_sbas_l1_mt3_fc_16,    tvb, 4,  4, ENC_BIG_ENDIAN);
1151     proto_tree_add_item(sbas_l1_mt3_tree, hf_sbas_l1_mt3_fc_17,    tvb, 5,  4, ENC_BIG_ENDIAN);
1152     proto_tree_add_item(sbas_l1_mt3_tree, hf_sbas_l1_mt3_fc_18,    tvb, 7,  4, ENC_BIG_ENDIAN);
1153     proto_tree_add_item(sbas_l1_mt3_tree, hf_sbas_l1_mt3_fc_19,    tvb, 8,  4, ENC_BIG_ENDIAN);
1154     proto_tree_add_item(sbas_l1_mt3_tree, hf_sbas_l1_mt3_fc_20,    tvb, 10, 4, ENC_BIG_ENDIAN);
1155     proto_tree_add_item(sbas_l1_mt3_tree, hf_sbas_l1_mt3_fc_21,    tvb, 11, 4, ENC_BIG_ENDIAN);
1156     proto_tree_add_item(sbas_l1_mt3_tree, hf_sbas_l1_mt3_fc_22,    tvb, 13, 4, ENC_BIG_ENDIAN);
1157     proto_tree_add_item(sbas_l1_mt3_tree, hf_sbas_l1_mt3_fc_23,    tvb, 14, 4, ENC_BIG_ENDIAN);
1158     proto_tree_add_item(sbas_l1_mt3_tree, hf_sbas_l1_mt3_fc_24,    tvb, 16, 4, ENC_BIG_ENDIAN);
1159     proto_tree_add_item(sbas_l1_mt3_tree, hf_sbas_l1_mt3_fc_25,    tvb, 17, 4, ENC_BIG_ENDIAN);
1160     proto_tree_add_item(sbas_l1_mt3_tree, hf_sbas_l1_mt3_fc_26,    tvb, 19, 4, ENC_BIG_ENDIAN);
1161     proto_tree_add_item(sbas_l1_mt3_tree, hf_sbas_l1_mt3_udrei_14, tvb, 20, 2, ENC_BIG_ENDIAN);
1162     proto_tree_add_item(sbas_l1_mt3_tree, hf_sbas_l1_mt3_udrei_15, tvb, 21, 2, ENC_BIG_ENDIAN);
1163     proto_tree_add_item(sbas_l1_mt3_tree, hf_sbas_l1_mt3_udrei_16, tvb, 21, 2, ENC_BIG_ENDIAN);
1164     proto_tree_add_item(sbas_l1_mt3_tree, hf_sbas_l1_mt3_udrei_17, tvb, 22, 2, ENC_BIG_ENDIAN);
1165     proto_tree_add_item(sbas_l1_mt3_tree, hf_sbas_l1_mt3_udrei_18, tvb, 22, 2, ENC_BIG_ENDIAN);
1166     proto_tree_add_item(sbas_l1_mt3_tree, hf_sbas_l1_mt3_udrei_19, tvb, 23, 2, ENC_BIG_ENDIAN);
1167     proto_tree_add_item(sbas_l1_mt3_tree, hf_sbas_l1_mt3_udrei_20, tvb, 23, 2, ENC_BIG_ENDIAN);
1168     proto_tree_add_item(sbas_l1_mt3_tree, hf_sbas_l1_mt3_udrei_21, tvb, 24, 2, ENC_BIG_ENDIAN);
1169     proto_tree_add_item(sbas_l1_mt3_tree, hf_sbas_l1_mt3_udrei_22, tvb, 24, 2, ENC_BIG_ENDIAN);
1170     proto_tree_add_item(sbas_l1_mt3_tree, hf_sbas_l1_mt3_udrei_23, tvb, 25, 2, ENC_BIG_ENDIAN);
1171     proto_tree_add_item(sbas_l1_mt3_tree, hf_sbas_l1_mt3_udrei_24, tvb, 25, 2, ENC_BIG_ENDIAN);
1172     proto_tree_add_item(sbas_l1_mt3_tree, hf_sbas_l1_mt3_udrei_25, tvb, 26, 2, ENC_BIG_ENDIAN);
1173     proto_tree_add_item(sbas_l1_mt3_tree, hf_sbas_l1_mt3_udrei_26, tvb, 26, 2, ENC_BIG_ENDIAN);
1174
1175     return tvb_captured_length(tvb);
1176 }
1177
1178 /* Dissect SBAS L1 MT 4 */
1179 static int dissect_sbas_l1_mt4(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void *data _U_) {
1180     col_set_str(pinfo->cinfo, COL_PROTOCOL, "SBAS L1 MT4");
1181     col_clear(pinfo->cinfo, COL_INFO);
1182
1183     proto_item *ti = proto_tree_add_item(tree, hf_sbas_l1_mt4, tvb, 0, 32, ENC_NA);
1184     proto_tree *sbas_l1_mt4_tree = proto_item_add_subtree(ti, ett_sbas_l1_mt4);
1185
1186     proto_tree_add_item(sbas_l1_mt4_tree, hf_sbas_l1_mt4_iodf_4,   tvb, 0,  1, ENC_NA);
1187     proto_tree_add_item(sbas_l1_mt4_tree, hf_sbas_l1_mt4_iodp,     tvb, 1,  1, ENC_NA);
1188     proto_tree_add_item(sbas_l1_mt4_tree, hf_sbas_l1_mt4_fc_27,    tvb, 1,  4, ENC_BIG_ENDIAN);
1189     proto_tree_add_item(sbas_l1_mt4_tree, hf_sbas_l1_mt4_fc_28,    tvb, 2,  4, ENC_BIG_ENDIAN);
1190     proto_tree_add_item(sbas_l1_mt4_tree, hf_sbas_l1_mt4_fc_29,    tvb, 4,  4, ENC_BIG_ENDIAN);
1191     proto_tree_add_item(sbas_l1_mt4_tree, hf_sbas_l1_mt4_fc_30,    tvb, 5,  4, ENC_BIG_ENDIAN);
1192     proto_tree_add_item(sbas_l1_mt4_tree, hf_sbas_l1_mt4_fc_31,    tvb, 7,  4, ENC_BIG_ENDIAN);
1193     proto_tree_add_item(sbas_l1_mt4_tree, hf_sbas_l1_mt4_fc_32,    tvb, 8,  4, ENC_BIG_ENDIAN);
1194     proto_tree_add_item(sbas_l1_mt4_tree, hf_sbas_l1_mt4_fc_33,    tvb, 10, 4, ENC_BIG_ENDIAN);
1195     proto_tree_add_item(sbas_l1_mt4_tree, hf_sbas_l1_mt4_fc_34,    tvb, 11, 4, ENC_BIG_ENDIAN);
1196     proto_tree_add_item(sbas_l1_mt4_tree, hf_sbas_l1_mt4_fc_35,    tvb, 13, 4, ENC_BIG_ENDIAN);
1197     proto_tree_add_item(sbas_l1_mt4_tree, hf_sbas_l1_mt4_fc_36,    tvb, 14, 4, ENC_BIG_ENDIAN);
1198     proto_tree_add_item(sbas_l1_mt4_tree, hf_sbas_l1_mt4_fc_37,    tvb, 16, 4, ENC_BIG_ENDIAN);
1199     proto_tree_add_item(sbas_l1_mt4_tree, hf_sbas_l1_mt4_fc_38,    tvb, 17, 4, ENC_BIG_ENDIAN);
1200     proto_tree_add_item(sbas_l1_mt4_tree, hf_sbas_l1_mt4_fc_39,    tvb, 19, 4, ENC_BIG_ENDIAN);
1201     proto_tree_add_item(sbas_l1_mt4_tree, hf_sbas_l1_mt4_udrei_27, tvb, 20, 2, ENC_BIG_ENDIAN);
1202     proto_tree_add_item(sbas_l1_mt4_tree, hf_sbas_l1_mt4_udrei_28, tvb, 21, 2, ENC_BIG_ENDIAN);
1203     proto_tree_add_item(sbas_l1_mt4_tree, hf_sbas_l1_mt4_udrei_29, tvb, 21, 2, ENC_BIG_ENDIAN);
1204     proto_tree_add_item(sbas_l1_mt4_tree, hf_sbas_l1_mt4_udrei_30, tvb, 22, 2, ENC_BIG_ENDIAN);
1205     proto_tree_add_item(sbas_l1_mt4_tree, hf_sbas_l1_mt4_udrei_31, tvb, 22, 2, ENC_BIG_ENDIAN);
1206     proto_tree_add_item(sbas_l1_mt4_tree, hf_sbas_l1_mt4_udrei_32, tvb, 23, 2, ENC_BIG_ENDIAN);
1207     proto_tree_add_item(sbas_l1_mt4_tree, hf_sbas_l1_mt4_udrei_33, tvb, 23, 2, ENC_BIG_ENDIAN);
1208     proto_tree_add_item(sbas_l1_mt4_tree, hf_sbas_l1_mt4_udrei_34, tvb, 24, 2, ENC_BIG_ENDIAN);
1209     proto_tree_add_item(sbas_l1_mt4_tree, hf_sbas_l1_mt4_udrei_35, tvb, 24, 2, ENC_BIG_ENDIAN);
1210     proto_tree_add_item(sbas_l1_mt4_tree, hf_sbas_l1_mt4_udrei_36, tvb, 25, 2, ENC_BIG_ENDIAN);
1211     proto_tree_add_item(sbas_l1_mt4_tree, hf_sbas_l1_mt4_udrei_37, tvb, 25, 2, ENC_BIG_ENDIAN);
1212     proto_tree_add_item(sbas_l1_mt4_tree, hf_sbas_l1_mt4_udrei_38, tvb, 26, 2, ENC_BIG_ENDIAN);
1213     proto_tree_add_item(sbas_l1_mt4_tree, hf_sbas_l1_mt4_udrei_39, tvb, 26, 2, ENC_BIG_ENDIAN);
1214
1215     return tvb_captured_length(tvb);
1216 }
1217
1218 /* Dissect SBAS L1 MT 5 */
1219 static int dissect_sbas_l1_mt5(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void *data _U_) {
1220     col_set_str(pinfo->cinfo, COL_PROTOCOL, "SBAS L1 MT5");
1221     col_clear(pinfo->cinfo, COL_INFO);
1222
1223     proto_item *ti = proto_tree_add_item(tree, hf_sbas_l1_mt5, tvb, 0, 32, ENC_NA);
1224     proto_tree *sbas_l1_mt5_tree = proto_item_add_subtree(ti, ett_sbas_l1_mt5);
1225
1226     proto_tree_add_item(sbas_l1_mt5_tree, hf_sbas_l1_mt5_iodf_5,   tvb, 0,  1, ENC_NA);
1227     proto_tree_add_item(sbas_l1_mt5_tree, hf_sbas_l1_mt5_iodp,     tvb, 1,  1, ENC_NA);
1228     proto_tree_add_item(sbas_l1_mt5_tree, hf_sbas_l1_mt5_fc_40,    tvb, 1,  4, ENC_BIG_ENDIAN);
1229     proto_tree_add_item(sbas_l1_mt5_tree, hf_sbas_l1_mt5_fc_41,    tvb, 2,  4, ENC_BIG_ENDIAN);
1230     proto_tree_add_item(sbas_l1_mt5_tree, hf_sbas_l1_mt5_fc_42,    tvb, 4,  4, ENC_BIG_ENDIAN);
1231     proto_tree_add_item(sbas_l1_mt5_tree, hf_sbas_l1_mt5_fc_43,    tvb, 5,  4, ENC_BIG_ENDIAN);
1232     proto_tree_add_item(sbas_l1_mt5_tree, hf_sbas_l1_mt5_fc_44,    tvb, 7,  4, ENC_BIG_ENDIAN);
1233     proto_tree_add_item(sbas_l1_mt5_tree, hf_sbas_l1_mt5_fc_45,    tvb, 8,  4, ENC_BIG_ENDIAN);
1234     proto_tree_add_item(sbas_l1_mt5_tree, hf_sbas_l1_mt5_fc_46,    tvb, 10, 4, ENC_BIG_ENDIAN);
1235     proto_tree_add_item(sbas_l1_mt5_tree, hf_sbas_l1_mt5_fc_47,    tvb, 11, 4, ENC_BIG_ENDIAN);
1236     proto_tree_add_item(sbas_l1_mt5_tree, hf_sbas_l1_mt5_fc_48,    tvb, 13, 4, ENC_BIG_ENDIAN);
1237     proto_tree_add_item(sbas_l1_mt5_tree, hf_sbas_l1_mt5_fc_49,    tvb, 14, 4, ENC_BIG_ENDIAN);
1238     proto_tree_add_item(sbas_l1_mt5_tree, hf_sbas_l1_mt5_fc_50,    tvb, 16, 4, ENC_BIG_ENDIAN);
1239     proto_tree_add_item(sbas_l1_mt5_tree, hf_sbas_l1_mt5_fc_51,    tvb, 17, 4, ENC_BIG_ENDIAN);
1240     proto_tree_add_item(sbas_l1_mt5_tree, hf_sbas_l1_mt5_fc_52,    tvb, 19, 4, ENC_BIG_ENDIAN);
1241     proto_tree_add_item(sbas_l1_mt5_tree, hf_sbas_l1_mt5_udrei_40, tvb, 20, 2, ENC_BIG_ENDIAN);
1242     proto_tree_add_item(sbas_l1_mt5_tree, hf_sbas_l1_mt5_udrei_41, tvb, 21, 2, ENC_BIG_ENDIAN);
1243     proto_tree_add_item(sbas_l1_mt5_tree, hf_sbas_l1_mt5_udrei_42, tvb, 21, 2, ENC_BIG_ENDIAN);
1244     proto_tree_add_item(sbas_l1_mt5_tree, hf_sbas_l1_mt5_udrei_43, tvb, 22, 2, ENC_BIG_ENDIAN);
1245     proto_tree_add_item(sbas_l1_mt5_tree, hf_sbas_l1_mt5_udrei_44, tvb, 22, 2, ENC_BIG_ENDIAN);
1246     proto_tree_add_item(sbas_l1_mt5_tree, hf_sbas_l1_mt5_udrei_45, tvb, 23, 2, ENC_BIG_ENDIAN);
1247     proto_tree_add_item(sbas_l1_mt5_tree, hf_sbas_l1_mt5_udrei_46, tvb, 23, 2, ENC_BIG_ENDIAN);
1248     proto_tree_add_item(sbas_l1_mt5_tree, hf_sbas_l1_mt5_udrei_47, tvb, 24, 2, ENC_BIG_ENDIAN);
1249     proto_tree_add_item(sbas_l1_mt5_tree, hf_sbas_l1_mt5_udrei_48, tvb, 24, 2, ENC_BIG_ENDIAN);
1250     proto_tree_add_item(sbas_l1_mt5_tree, hf_sbas_l1_mt5_udrei_49, tvb, 25, 2, ENC_BIG_ENDIAN);
1251     proto_tree_add_item(sbas_l1_mt5_tree, hf_sbas_l1_mt5_udrei_50, tvb, 25, 2, ENC_BIG_ENDIAN);
1252     proto_tree_add_item(sbas_l1_mt5_tree, hf_sbas_l1_mt5_udrei_51, tvb, 26, 2, ENC_BIG_ENDIAN);
1253     proto_tree_add_item(sbas_l1_mt5_tree, hf_sbas_l1_mt5_udrei_52, tvb, 26, 2, ENC_BIG_ENDIAN);
1254
1255     return tvb_captured_length(tvb);
1256 }
1257
1258 /* Dissect SBAS L1 MT 6 */
1259 static int dissect_sbas_l1_mt6(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void *data _U_) {
1260     col_set_str(pinfo->cinfo, COL_PROTOCOL, "SBAS L1 MT6");
1261     col_clear(pinfo->cinfo, COL_INFO);
1262
1263     proto_item *ti = proto_tree_add_item(tree, hf_sbas_l1_mt6, tvb, 0, 32, ENC_NA);
1264     proto_tree *sbas_l1_mt6_tree = proto_item_add_subtree(ti, ett_sbas_l1_mt6);
1265
1266     // IODF_2 to IODF_5
1267     proto_tree_add_item(sbas_l1_mt6_tree, hf_sbas_l1_mt6_iodf_2, tvb, 0, 1, ENC_NA);
1268     proto_tree_add_item(sbas_l1_mt6_tree, hf_sbas_l1_mt6_iodf_3, tvb, 1, 1, ENC_NA);
1269     proto_tree_add_item(sbas_l1_mt6_tree, hf_sbas_l1_mt6_iodf_4, tvb, 1, 1, ENC_NA);
1270     proto_tree_add_item(sbas_l1_mt6_tree, hf_sbas_l1_mt6_iodf_5, tvb, 1, 1, ENC_NA);
1271
1272     // UDREI_i
1273     proto_tree_add_item(sbas_l1_mt6_tree, hf_sbas_l1_mt6_udrei_1,  tvb, 1,  2, ENC_BIG_ENDIAN);
1274     proto_tree_add_item(sbas_l1_mt6_tree, hf_sbas_l1_mt6_udrei_2,  tvb, 2,  2, ENC_BIG_ENDIAN);
1275     proto_tree_add_item(sbas_l1_mt6_tree, hf_sbas_l1_mt6_udrei_3,  tvb, 2,  2, ENC_BIG_ENDIAN);
1276     proto_tree_add_item(sbas_l1_mt6_tree, hf_sbas_l1_mt6_udrei_4,  tvb, 3,  2, ENC_BIG_ENDIAN);
1277     proto_tree_add_item(sbas_l1_mt6_tree, hf_sbas_l1_mt6_udrei_5,  tvb, 3,  2, ENC_BIG_ENDIAN);
1278     proto_tree_add_item(sbas_l1_mt6_tree, hf_sbas_l1_mt6_udrei_6,  tvb, 4,  2, ENC_BIG_ENDIAN);
1279     proto_tree_add_item(sbas_l1_mt6_tree, hf_sbas_l1_mt6_udrei_7,  tvb, 4,  2, ENC_BIG_ENDIAN);
1280     proto_tree_add_item(sbas_l1_mt6_tree, hf_sbas_l1_mt6_udrei_8,  tvb, 5,  2, ENC_BIG_ENDIAN);
1281     proto_tree_add_item(sbas_l1_mt6_tree, hf_sbas_l1_mt6_udrei_9,  tvb, 5,  2, ENC_BIG_ENDIAN);
1282     proto_tree_add_item(sbas_l1_mt6_tree, hf_sbas_l1_mt6_udrei_10, tvb, 6,  2, ENC_BIG_ENDIAN);
1283     proto_tree_add_item(sbas_l1_mt6_tree, hf_sbas_l1_mt6_udrei_11, tvb, 6,  2, ENC_BIG_ENDIAN);
1284     proto_tree_add_item(sbas_l1_mt6_tree, hf_sbas_l1_mt6_udrei_12, tvb, 7,  2, ENC_BIG_ENDIAN);
1285     proto_tree_add_item(sbas_l1_mt6_tree, hf_sbas_l1_mt6_udrei_13, tvb, 7,  2, ENC_BIG_ENDIAN);
1286     proto_tree_add_item(sbas_l1_mt6_tree, hf_sbas_l1_mt6_udrei_14, tvb, 8,  2, ENC_BIG_ENDIAN);
1287     proto_tree_add_item(sbas_l1_mt6_tree, hf_sbas_l1_mt6_udrei_15, tvb, 8,  2, ENC_BIG_ENDIAN);
1288     proto_tree_add_item(sbas_l1_mt6_tree, hf_sbas_l1_mt6_udrei_16, tvb, 9,  2, ENC_BIG_ENDIAN);
1289     proto_tree_add_item(sbas_l1_mt6_tree, hf_sbas_l1_mt6_udrei_17, tvb, 9,  2, ENC_BIG_ENDIAN);
1290     proto_tree_add_item(sbas_l1_mt6_tree, hf_sbas_l1_mt6_udrei_18, tvb, 10, 2, ENC_BIG_ENDIAN);
1291     proto_tree_add_item(sbas_l1_mt6_tree, hf_sbas_l1_mt6_udrei_19, tvb, 10, 2, ENC_BIG_ENDIAN);
1292     proto_tree_add_item(sbas_l1_mt6_tree, hf_sbas_l1_mt6_udrei_20, tvb, 11, 2, ENC_BIG_ENDIAN);
1293     proto_tree_add_item(sbas_l1_mt6_tree, hf_sbas_l1_mt6_udrei_21, tvb, 11, 2, ENC_BIG_ENDIAN);
1294     proto_tree_add_item(sbas_l1_mt6_tree, hf_sbas_l1_mt6_udrei_22, tvb, 12, 2, ENC_BIG_ENDIAN);
1295     proto_tree_add_item(sbas_l1_mt6_tree, hf_sbas_l1_mt6_udrei_23, tvb, 12, 2, ENC_BIG_ENDIAN);
1296     proto_tree_add_item(sbas_l1_mt6_tree, hf_sbas_l1_mt6_udrei_24, tvb, 13, 2, ENC_BIG_ENDIAN);
1297     proto_tree_add_item(sbas_l1_mt6_tree, hf_sbas_l1_mt6_udrei_25, tvb, 13, 2, ENC_BIG_ENDIAN);
1298     proto_tree_add_item(sbas_l1_mt6_tree, hf_sbas_l1_mt6_udrei_26, tvb, 14, 2, ENC_BIG_ENDIAN);
1299     proto_tree_add_item(sbas_l1_mt6_tree, hf_sbas_l1_mt6_udrei_27, tvb, 14, 2, ENC_BIG_ENDIAN);
1300     proto_tree_add_item(sbas_l1_mt6_tree, hf_sbas_l1_mt6_udrei_28, tvb, 15, 2, ENC_BIG_ENDIAN);
1301     proto_tree_add_item(sbas_l1_mt6_tree, hf_sbas_l1_mt6_udrei_29, tvb, 15, 2, ENC_BIG_ENDIAN);
1302     proto_tree_add_item(sbas_l1_mt6_tree, hf_sbas_l1_mt6_udrei_30, tvb, 16, 2, ENC_BIG_ENDIAN);
1303     proto_tree_add_item(sbas_l1_mt6_tree, hf_sbas_l1_mt6_udrei_31, tvb, 16, 2, ENC_BIG_ENDIAN);
1304     proto_tree_add_item(sbas_l1_mt6_tree, hf_sbas_l1_mt6_udrei_32, tvb, 17, 2, ENC_BIG_ENDIAN);
1305     proto_tree_add_item(sbas_l1_mt6_tree, hf_sbas_l1_mt6_udrei_33, tvb, 17, 2, ENC_BIG_ENDIAN);
1306     proto_tree_add_item(sbas_l1_mt6_tree, hf_sbas_l1_mt6_udrei_34, tvb, 18, 2, ENC_BIG_ENDIAN);
1307     proto_tree_add_item(sbas_l1_mt6_tree, hf_sbas_l1_mt6_udrei_35, tvb, 18, 2, ENC_BIG_ENDIAN);
1308     proto_tree_add_item(sbas_l1_mt6_tree, hf_sbas_l1_mt6_udrei_36, tvb, 19, 2, ENC_BIG_ENDIAN);
1309     proto_tree_add_item(sbas_l1_mt6_tree, hf_sbas_l1_mt6_udrei_37, tvb, 19, 2, ENC_BIG_ENDIAN);
1310     proto_tree_add_item(sbas_l1_mt6_tree, hf_sbas_l1_mt6_udrei_38, tvb, 20, 2, ENC_BIG_ENDIAN);
1311     proto_tree_add_item(sbas_l1_mt6_tree, hf_sbas_l1_mt6_udrei_39, tvb, 20, 2, ENC_BIG_ENDIAN);
1312     proto_tree_add_item(sbas_l1_mt6_tree, hf_sbas_l1_mt6_udrei_40, tvb, 21, 2, ENC_BIG_ENDIAN);
1313     proto_tree_add_item(sbas_l1_mt6_tree, hf_sbas_l1_mt6_udrei_41, tvb, 21, 2, ENC_BIG_ENDIAN);
1314     proto_tree_add_item(sbas_l1_mt6_tree, hf_sbas_l1_mt6_udrei_42, tvb, 22, 2, ENC_BIG_ENDIAN);
1315     proto_tree_add_item(sbas_l1_mt6_tree, hf_sbas_l1_mt6_udrei_43, tvb, 22, 2, ENC_BIG_ENDIAN);
1316     proto_tree_add_item(sbas_l1_mt6_tree, hf_sbas_l1_mt6_udrei_44, tvb, 23, 2, ENC_BIG_ENDIAN);
1317     proto_tree_add_item(sbas_l1_mt6_tree, hf_sbas_l1_mt6_udrei_45, tvb, 23, 2, ENC_BIG_ENDIAN);
1318     proto_tree_add_item(sbas_l1_mt6_tree, hf_sbas_l1_mt6_udrei_46, tvb, 24, 2, ENC_BIG_ENDIAN);
1319     proto_tree_add_item(sbas_l1_mt6_tree, hf_sbas_l1_mt6_udrei_47, tvb, 24, 2, ENC_BIG_ENDIAN);
1320     proto_tree_add_item(sbas_l1_mt6_tree, hf_sbas_l1_mt6_udrei_48, tvb, 25, 2, ENC_BIG_ENDIAN);
1321     proto_tree_add_item(sbas_l1_mt6_tree, hf_sbas_l1_mt6_udrei_49, tvb, 25, 2, ENC_BIG_ENDIAN);
1322     proto_tree_add_item(sbas_l1_mt6_tree, hf_sbas_l1_mt6_udrei_50, tvb, 26, 2, ENC_BIG_ENDIAN);
1323     proto_tree_add_item(sbas_l1_mt6_tree, hf_sbas_l1_mt6_udrei_51, tvb, 26, 2, ENC_BIG_ENDIAN);
1324
1325     return tvb_captured_length(tvb);
1326 }
1327
1328 /* Dissect SBAS L1 MT 7 */
1329 static int dissect_sbas_l1_mt7(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void *data _U_) {
1330     col_set_str(pinfo->cinfo, COL_PROTOCOL, "SBAS L1 MT7");
1331     col_clear(pinfo->cinfo, COL_INFO);
1332
1333     proto_item *ti = proto_tree_add_item(tree, hf_sbas_l1_mt7, tvb, 0, 32, ENC_NA);
1334     proto_tree *sbas_l1_mt7_tree = proto_item_add_subtree(ti, ett_sbas_l1_mt7);
1335
1336     proto_tree_add_item(sbas_l1_mt7_tree, hf_sbas_l1_mt7_t_lat,  tvb, 0, 2, ENC_BIG_ENDIAN);
1337     proto_tree_add_item(sbas_l1_mt7_tree, hf_sbas_l1_mt7_iodp,   tvb, 1, 1, ENC_NA);
1338     proto_tree_add_item(sbas_l1_mt7_tree, hf_sbas_l1_mt7_spare,  tvb, 1, 1, ENC_NA);
1339
1340     // Degradation factor indicator ai_i
1341     proto_tree_add_item(sbas_l1_mt7_tree, hf_sbas_l1_mt7_ai_1,  tvb, 1,  2, ENC_BIG_ENDIAN);
1342     proto_tree_add_item(sbas_l1_mt7_tree, hf_sbas_l1_mt7_ai_2,  tvb, 2,  2, ENC_BIG_ENDIAN);
1343     proto_tree_add_item(sbas_l1_mt7_tree, hf_sbas_l1_mt7_ai_3,  tvb, 2,  2, ENC_BIG_ENDIAN);
1344     proto_tree_add_item(sbas_l1_mt7_tree, hf_sbas_l1_mt7_ai_4,  tvb, 3,  2, ENC_BIG_ENDIAN);
1345     proto_tree_add_item(sbas_l1_mt7_tree, hf_sbas_l1_mt7_ai_5,  tvb, 3,  2, ENC_BIG_ENDIAN);
1346     proto_tree_add_item(sbas_l1_mt7_tree, hf_sbas_l1_mt7_ai_6,  tvb, 4,  2, ENC_BIG_ENDIAN);
1347     proto_tree_add_item(sbas_l1_mt7_tree, hf_sbas_l1_mt7_ai_7,  tvb, 4,  2, ENC_BIG_ENDIAN);
1348     proto_tree_add_item(sbas_l1_mt7_tree, hf_sbas_l1_mt7_ai_8,  tvb, 5,  2, ENC_BIG_ENDIAN);
1349     proto_tree_add_item(sbas_l1_mt7_tree, hf_sbas_l1_mt7_ai_9,  tvb, 5,  2, ENC_BIG_ENDIAN);
1350     proto_tree_add_item(sbas_l1_mt7_tree, hf_sbas_l1_mt7_ai_10, tvb, 6,  2, ENC_BIG_ENDIAN);
1351     proto_tree_add_item(sbas_l1_mt7_tree, hf_sbas_l1_mt7_ai_11, tvb, 6,  2, ENC_BIG_ENDIAN);
1352     proto_tree_add_item(sbas_l1_mt7_tree, hf_sbas_l1_mt7_ai_12, tvb, 7,  2, ENC_BIG_ENDIAN);
1353     proto_tree_add_item(sbas_l1_mt7_tree, hf_sbas_l1_mt7_ai_13, tvb, 7,  2, ENC_BIG_ENDIAN);
1354     proto_tree_add_item(sbas_l1_mt7_tree, hf_sbas_l1_mt7_ai_14, tvb, 8,  2, ENC_BIG_ENDIAN);
1355     proto_tree_add_item(sbas_l1_mt7_tree, hf_sbas_l1_mt7_ai_15, tvb, 8,  2, ENC_BIG_ENDIAN);
1356     proto_tree_add_item(sbas_l1_mt7_tree, hf_sbas_l1_mt7_ai_16, tvb, 9,  2, ENC_BIG_ENDIAN);
1357     proto_tree_add_item(sbas_l1_mt7_tree, hf_sbas_l1_mt7_ai_17, tvb, 9,  2, ENC_BIG_ENDIAN);
1358     proto_tree_add_item(sbas_l1_mt7_tree, hf_sbas_l1_mt7_ai_18, tvb, 10, 2, ENC_BIG_ENDIAN);
1359     proto_tree_add_item(sbas_l1_mt7_tree, hf_sbas_l1_mt7_ai_19, tvb, 10, 2, ENC_BIG_ENDIAN);
1360     proto_tree_add_item(sbas_l1_mt7_tree, hf_sbas_l1_mt7_ai_20, tvb, 11, 2, ENC_BIG_ENDIAN);
1361     proto_tree_add_item(sbas_l1_mt7_tree, hf_sbas_l1_mt7_ai_21, tvb, 11, 2, ENC_BIG_ENDIAN);
1362     proto_tree_add_item(sbas_l1_mt7_tree, hf_sbas_l1_mt7_ai_22, tvb, 12, 2, ENC_BIG_ENDIAN);
1363     proto_tree_add_item(sbas_l1_mt7_tree, hf_sbas_l1_mt7_ai_23, tvb, 12, 2, ENC_BIG_ENDIAN);
1364     proto_tree_add_item(sbas_l1_mt7_tree, hf_sbas_l1_mt7_ai_24, tvb, 13, 2, ENC_BIG_ENDIAN);
1365     proto_tree_add_item(sbas_l1_mt7_tree, hf_sbas_l1_mt7_ai_25, tvb, 13, 2, ENC_BIG_ENDIAN);
1366     proto_tree_add_item(sbas_l1_mt7_tree, hf_sbas_l1_mt7_ai_26, tvb, 14, 2, ENC_BIG_ENDIAN);
1367     proto_tree_add_item(sbas_l1_mt7_tree, hf_sbas_l1_mt7_ai_27, tvb, 14, 2, ENC_BIG_ENDIAN);
1368     proto_tree_add_item(sbas_l1_mt7_tree, hf_sbas_l1_mt7_ai_28, tvb, 15, 2, ENC_BIG_ENDIAN);
1369     proto_tree_add_item(sbas_l1_mt7_tree, hf_sbas_l1_mt7_ai_29, tvb, 15, 2, ENC_BIG_ENDIAN);
1370     proto_tree_add_item(sbas_l1_mt7_tree, hf_sbas_l1_mt7_ai_30, tvb, 16, 2, ENC_BIG_ENDIAN);
1371     proto_tree_add_item(sbas_l1_mt7_tree, hf_sbas_l1_mt7_ai_31, tvb, 16, 2, ENC_BIG_ENDIAN);
1372     proto_tree_add_item(sbas_l1_mt7_tree, hf_sbas_l1_mt7_ai_32, tvb, 17, 2, ENC_BIG_ENDIAN);
1373     proto_tree_add_item(sbas_l1_mt7_tree, hf_sbas_l1_mt7_ai_33, tvb, 17, 2, ENC_BIG_ENDIAN);
1374     proto_tree_add_item(sbas_l1_mt7_tree, hf_sbas_l1_mt7_ai_34, tvb, 18, 2, ENC_BIG_ENDIAN);
1375     proto_tree_add_item(sbas_l1_mt7_tree, hf_sbas_l1_mt7_ai_35, tvb, 18, 2, ENC_BIG_ENDIAN);
1376     proto_tree_add_item(sbas_l1_mt7_tree, hf_sbas_l1_mt7_ai_36, tvb, 19, 2, ENC_BIG_ENDIAN);
1377     proto_tree_add_item(sbas_l1_mt7_tree, hf_sbas_l1_mt7_ai_37, tvb, 19, 2, ENC_BIG_ENDIAN);
1378     proto_tree_add_item(sbas_l1_mt7_tree, hf_sbas_l1_mt7_ai_38, tvb, 20, 2, ENC_BIG_ENDIAN);
1379     proto_tree_add_item(sbas_l1_mt7_tree, hf_sbas_l1_mt7_ai_39, tvb, 20, 2, ENC_BIG_ENDIAN);
1380     proto_tree_add_item(sbas_l1_mt7_tree, hf_sbas_l1_mt7_ai_40, tvb, 21, 2, ENC_BIG_ENDIAN);
1381     proto_tree_add_item(sbas_l1_mt7_tree, hf_sbas_l1_mt7_ai_41, tvb, 21, 2, ENC_BIG_ENDIAN);
1382     proto_tree_add_item(sbas_l1_mt7_tree, hf_sbas_l1_mt7_ai_42, tvb, 22, 2, ENC_BIG_ENDIAN);
1383     proto_tree_add_item(sbas_l1_mt7_tree, hf_sbas_l1_mt7_ai_43, tvb, 22, 2, ENC_BIG_ENDIAN);
1384     proto_tree_add_item(sbas_l1_mt7_tree, hf_sbas_l1_mt7_ai_44, tvb, 23, 2, ENC_BIG_ENDIAN);
1385     proto_tree_add_item(sbas_l1_mt7_tree, hf_sbas_l1_mt7_ai_45, tvb, 23, 2, ENC_BIG_ENDIAN);
1386     proto_tree_add_item(sbas_l1_mt7_tree, hf_sbas_l1_mt7_ai_46, tvb, 24, 2, ENC_BIG_ENDIAN);
1387     proto_tree_add_item(sbas_l1_mt7_tree, hf_sbas_l1_mt7_ai_47, tvb, 24, 2, ENC_BIG_ENDIAN);
1388     proto_tree_add_item(sbas_l1_mt7_tree, hf_sbas_l1_mt7_ai_48, tvb, 25, 2, ENC_BIG_ENDIAN);
1389     proto_tree_add_item(sbas_l1_mt7_tree, hf_sbas_l1_mt7_ai_49, tvb, 25, 2, ENC_BIG_ENDIAN);
1390     proto_tree_add_item(sbas_l1_mt7_tree, hf_sbas_l1_mt7_ai_50, tvb, 26, 2, ENC_BIG_ENDIAN);
1391     proto_tree_add_item(sbas_l1_mt7_tree, hf_sbas_l1_mt7_ai_51, tvb, 26, 2, ENC_BIG_ENDIAN);
1392
1393     return tvb_captured_length(tvb);
1394 }
1395
1396 /* Dissect SBAS L1 MT 9 */
1397 static int dissect_sbas_l1_mt9(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void *data _U_) {
1398     col_set_str(pinfo->cinfo, COL_PROTOCOL, "SBAS L1 MT9");
1399     col_clear(pinfo->cinfo, COL_INFO);
1400
1401     proto_item *ti = proto_tree_add_item(tree, hf_sbas_l1_mt9, tvb, 0, 32, ENC_NA);
1402     proto_tree *sbas_l1_mt9_tree = proto_item_add_subtree(ti, ett_sbas_l1_mt9);
1403
1404     proto_tree_add_item(sbas_l1_mt9_tree, hf_sbas_l1_mt9_reserved, tvb,  0, 4, ENC_BIG_ENDIAN);
1405     proto_tree_add_item(sbas_l1_mt9_tree, hf_sbas_l1_mt9_t_0_geo,  tvb,  0, 4, ENC_BIG_ENDIAN);
1406     proto_tree_add_item(sbas_l1_mt9_tree, hf_sbas_l1_mt9_ura,      tvb,  0, 4, ENC_BIG_ENDIAN);
1407     proto_tree_add_item(sbas_l1_mt9_tree, hf_sbas_l1_mt9_x_g,      tvb,  3, 8, ENC_BIG_ENDIAN);
1408     proto_tree_add_item(sbas_l1_mt9_tree, hf_sbas_l1_mt9_y_g,      tvb,  7, 8, ENC_BIG_ENDIAN);
1409     proto_tree_add_item(sbas_l1_mt9_tree, hf_sbas_l1_mt9_z_g,      tvb, 11, 8, ENC_BIG_ENDIAN);
1410     proto_tree_add_item(sbas_l1_mt9_tree, hf_sbas_l1_mt9_x_g_vel,  tvb, 14, 4, ENC_BIG_ENDIAN);
1411     proto_tree_add_item(sbas_l1_mt9_tree, hf_sbas_l1_mt9_y_g_vel,  tvb, 16, 4, ENC_BIG_ENDIAN);
1412     proto_tree_add_item(sbas_l1_mt9_tree, hf_sbas_l1_mt9_z_g_vel,  tvb, 18, 4, ENC_BIG_ENDIAN);
1413     proto_tree_add_item(sbas_l1_mt9_tree, hf_sbas_l1_mt9_x_g_acc,  tvb, 21, 4, ENC_BIG_ENDIAN);
1414     proto_tree_add_item(sbas_l1_mt9_tree, hf_sbas_l1_mt9_y_g_acc,  tvb, 21, 4, ENC_BIG_ENDIAN);
1415     proto_tree_add_item(sbas_l1_mt9_tree, hf_sbas_l1_mt9_z_g_acc,  tvb, 21, 4, ENC_BIG_ENDIAN);
1416     proto_tree_add_item(sbas_l1_mt9_tree, hf_sbas_l1_mt9_a_gf0,    tvb, 24, 4, ENC_BIG_ENDIAN);
1417     proto_tree_add_item(sbas_l1_mt9_tree, hf_sbas_l1_mt9_a_gf1,    tvb, 24, 4, ENC_BIG_ENDIAN);
1418
1419     return tvb_captured_length(tvb);
1420 }
1421
1422 /* Dissect SBAS L1 MT 17 */
1423 static int dissect_sbas_l1_mt17(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void *data _U_) {
1424     uint8_t i;
1425     tvbuff_t *prn_tvb;
1426
1427     col_set_str(pinfo->cinfo, COL_PROTOCOL, "SBAS L1 MT17");
1428     col_clear(pinfo->cinfo, COL_INFO);
1429
1430     proto_item *ti = proto_tree_add_item(tree, hf_sbas_l1_mt17, tvb, 0, 32, ENC_NA);
1431     proto_tree *sbas_l1_mt17_tree = proto_item_add_subtree(ti, ett_sbas_l1_mt17);
1432
1433     // dissect data for each of 3 PRNs
1434     for (i = 0; i < 3; i++) {
1435         prn_tvb = tvb_new_octet_aligned(tvb, 6 + i*67, 67);
1436         if (prn_tvb) {
1437             add_new_data_source(pinfo, prn_tvb, "PRN data");
1438
1439             uint16_t prn = (tvb_get_uint16(prn_tvb, 0, ENC_BIG_ENDIAN) >> 6) & 0xff;
1440
1441             proto_tree *prn_tree = proto_tree_add_subtree_format(sbas_l1_mt17_tree, tvb, (6 + i * 67) / 8, (i == 0) ? 10 : 9, ett_sbas_l1_mt17_prn_data[i], NULL, "PRN %u", prn);
1442
1443             proto_tree_add_item(prn_tree, hf_sbas_l1_mt17_reserved, prn_tvb, 0,  1, ENC_NA);
1444             proto_tree_add_item(prn_tree, hf_sbas_l1_mt17_prn,      prn_tvb, 0,  2, ENC_BIG_ENDIAN);
1445
1446             proto_tree_add_bitmask(prn_tree, prn_tvb, 1, hf_sbas_l1_mt17_health_and_status, ett_sbas_l1_mt17_health_and_status, sbas_l1_mt17_health_and_status_fields, ENC_NA);
1447
1448             proto_tree_add_item(prn_tree, hf_sbas_l1_mt17_x_ga,     prn_tvb, 2,  4, ENC_BIG_ENDIAN);
1449             proto_tree_add_item(prn_tree, hf_sbas_l1_mt17_y_ga,     prn_tvb, 4,  4, ENC_BIG_ENDIAN);
1450             proto_tree_add_item(prn_tree, hf_sbas_l1_mt17_z_ga,     prn_tvb, 4,  4, ENC_BIG_ENDIAN);
1451             proto_tree_add_item(prn_tree, hf_sbas_l1_mt17_x_ga_vel, prn_tvb, 4,  4, ENC_BIG_ENDIAN);
1452             proto_tree_add_item(prn_tree, hf_sbas_l1_mt17_y_ga_vel, prn_tvb, 4,  4, ENC_BIG_ENDIAN);
1453             proto_tree_add_item(prn_tree, hf_sbas_l1_mt17_z_ga_vel, prn_tvb, 5,  4, ENC_BIG_ENDIAN);
1454         }
1455     }
1456
1457     proto_tree_add_item(sbas_l1_mt17_tree, hf_sbas_l1_mt17_t_a, tvb, 24, 4, ENC_BIG_ENDIAN);
1458
1459     return tvb_captured_length(tvb);
1460 }
1461
1462 /* Dissect SBAS L1 MT 18 */
1463 static int dissect_sbas_l1_mt18(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void *data _U_) {
1464     guint32 band_id;
1465
1466     col_set_str(pinfo->cinfo, COL_PROTOCOL, "SBAS L1 MT18");
1467     col_clear(pinfo->cinfo, COL_INFO);
1468
1469     proto_item *ti = proto_tree_add_item(tree, hf_sbas_l1_mt18, tvb, 0, 32, ENC_NA);
1470     proto_tree *sbas_l1_mt18_tree = proto_item_add_subtree(ti, ett_sbas_l1_mt18);
1471
1472     proto_tree_add_item(sbas_l1_mt18_tree,     hf_sbas_l1_mt18_nr_igp_bands,     tvb,  0, 2, ENC_BIG_ENDIAN);
1473     proto_tree_add_item_ret_uint(sbas_l1_mt18_tree, hf_sbas_l1_mt18_igp_band_id, tvb,  0, 2, ENC_BIG_ENDIAN, &band_id);
1474     proto_tree_add_item(sbas_l1_mt18_tree,     hf_sbas_l1_mt18_iodi_k,           tvb,  0, 2, ENC_BIG_ENDIAN);
1475
1476     if (band_id == 0) {
1477         proto_tree_add_item(sbas_l1_mt18_tree, hf_sbas_l1_mt18_igp_mask_180w,    tvb,  2, 8, ENC_BIG_ENDIAN);
1478         proto_tree_add_item(sbas_l1_mt18_tree, hf_sbas_l1_mt18_igp_mask_175w,    tvb,  2, 8, ENC_BIG_ENDIAN);
1479         proto_tree_add_item(sbas_l1_mt18_tree, hf_sbas_l1_mt18_igp_mask_170w,    tvb,  8, 8, ENC_BIG_ENDIAN);
1480         proto_tree_add_item(sbas_l1_mt18_tree, hf_sbas_l1_mt18_igp_mask_165w,    tvb,  8, 8, ENC_BIG_ENDIAN);
1481         proto_tree_add_item(sbas_l1_mt18_tree, hf_sbas_l1_mt18_igp_mask_160w,    tvb, 14, 8, ENC_BIG_ENDIAN);
1482         proto_tree_add_item(sbas_l1_mt18_tree, hf_sbas_l1_mt18_igp_mask_155w,    tvb, 14, 8, ENC_BIG_ENDIAN);
1483         proto_tree_add_item(sbas_l1_mt18_tree, hf_sbas_l1_mt18_igp_mask_150w,    tvb, 20, 8, ENC_BIG_ENDIAN);
1484         proto_tree_add_item(sbas_l1_mt18_tree, hf_sbas_l1_mt18_igp_mask_145w,    tvb, 20, 8, ENC_BIG_ENDIAN);
1485     }
1486     else if (band_id == 1) {
1487         proto_tree_add_item(sbas_l1_mt18_tree, hf_sbas_l1_mt18_igp_mask_140w,    tvb,  2, 8, ENC_BIG_ENDIAN);
1488         proto_tree_add_item(sbas_l1_mt18_tree, hf_sbas_l1_mt18_igp_mask_135w,    tvb,  2, 8, ENC_BIG_ENDIAN);
1489         proto_tree_add_item(sbas_l1_mt18_tree, hf_sbas_l1_mt18_igp_mask_130w,    tvb,  8, 8, ENC_BIG_ENDIAN);
1490         proto_tree_add_item(sbas_l1_mt18_tree, hf_sbas_l1_mt18_igp_mask_125w,    tvb,  8, 8, ENC_BIG_ENDIAN);
1491         proto_tree_add_item(sbas_l1_mt18_tree, hf_sbas_l1_mt18_igp_mask_120w,    tvb, 14, 8, ENC_BIG_ENDIAN);
1492         proto_tree_add_item(sbas_l1_mt18_tree, hf_sbas_l1_mt18_igp_mask_115w,    tvb, 14, 8, ENC_BIG_ENDIAN);
1493         proto_tree_add_item(sbas_l1_mt18_tree, hf_sbas_l1_mt18_igp_mask_110w,    tvb, 20, 8, ENC_BIG_ENDIAN);
1494         proto_tree_add_item(sbas_l1_mt18_tree, hf_sbas_l1_mt18_igp_mask_105w,    tvb, 20, 8, ENC_BIG_ENDIAN);
1495     }
1496     else if (band_id == 2) {
1497         proto_tree_add_item(sbas_l1_mt18_tree, hf_sbas_l1_mt18_igp_mask_100w,    tvb,  2, 8, ENC_BIG_ENDIAN);
1498         proto_tree_add_item(sbas_l1_mt18_tree, hf_sbas_l1_mt18_igp_mask_95w,     tvb,  2, 8, ENC_BIG_ENDIAN);
1499         proto_tree_add_item(sbas_l1_mt18_tree, hf_sbas_l1_mt18_igp_mask_90w,     tvb,  8, 8, ENC_BIG_ENDIAN);
1500         proto_tree_add_item(sbas_l1_mt18_tree, hf_sbas_l1_mt18_igp_mask_85w,     tvb,  8, 8, ENC_BIG_ENDIAN);
1501         proto_tree_add_item(sbas_l1_mt18_tree, hf_sbas_l1_mt18_igp_mask_80w,     tvb, 14, 8, ENC_BIG_ENDIAN);
1502         proto_tree_add_item(sbas_l1_mt18_tree, hf_sbas_l1_mt18_igp_mask_75w,     tvb, 14, 8, ENC_BIG_ENDIAN);
1503         proto_tree_add_item(sbas_l1_mt18_tree, hf_sbas_l1_mt18_igp_mask_70w,     tvb, 20, 8, ENC_BIG_ENDIAN);
1504         proto_tree_add_item(sbas_l1_mt18_tree, hf_sbas_l1_mt18_igp_mask_65w,     tvb, 20, 8, ENC_BIG_ENDIAN);
1505     }
1506     else if (band_id == 3) {
1507         proto_tree_add_item(sbas_l1_mt18_tree, hf_sbas_l1_mt18_igp_mask_60w,     tvb,  2, 8, ENC_BIG_ENDIAN);
1508         proto_tree_add_item(sbas_l1_mt18_tree, hf_sbas_l1_mt18_igp_mask_55w,     tvb,  2, 8, ENC_BIG_ENDIAN);
1509         proto_tree_add_item(sbas_l1_mt18_tree, hf_sbas_l1_mt18_igp_mask_50w,     tvb,  8, 8, ENC_BIG_ENDIAN);
1510         proto_tree_add_item(sbas_l1_mt18_tree, hf_sbas_l1_mt18_igp_mask_45w,     tvb,  8, 8, ENC_BIG_ENDIAN);
1511         proto_tree_add_item(sbas_l1_mt18_tree, hf_sbas_l1_mt18_igp_mask_40w,     tvb, 14, 8, ENC_BIG_ENDIAN);
1512         proto_tree_add_item(sbas_l1_mt18_tree, hf_sbas_l1_mt18_igp_mask_35w,     tvb, 14, 8, ENC_BIG_ENDIAN);
1513         proto_tree_add_item(sbas_l1_mt18_tree, hf_sbas_l1_mt18_igp_mask_30w,     tvb, 20, 8, ENC_BIG_ENDIAN);
1514         proto_tree_add_item(sbas_l1_mt18_tree, hf_sbas_l1_mt18_igp_mask_25w,     tvb, 20, 8, ENC_BIG_ENDIAN);
1515     }
1516     else if (band_id == 4) {
1517         proto_tree_add_item(sbas_l1_mt18_tree, hf_sbas_l1_mt18_igp_mask_20w,     tvb,  2, 8, ENC_BIG_ENDIAN);
1518         proto_tree_add_item(sbas_l1_mt18_tree, hf_sbas_l1_mt18_igp_mask_15w,     tvb,  2, 8, ENC_BIG_ENDIAN);
1519         proto_tree_add_item(sbas_l1_mt18_tree, hf_sbas_l1_mt18_igp_mask_10w,     tvb,  8, 8, ENC_BIG_ENDIAN);
1520         proto_tree_add_item(sbas_l1_mt18_tree, hf_sbas_l1_mt18_igp_mask_5w,      tvb,  8, 8, ENC_BIG_ENDIAN);
1521         proto_tree_add_item(sbas_l1_mt18_tree, hf_sbas_l1_mt18_igp_mask_0,       tvb, 14, 8, ENC_BIG_ENDIAN);
1522         proto_tree_add_item(sbas_l1_mt18_tree, hf_sbas_l1_mt18_igp_mask_5e,      tvb, 14, 8, ENC_BIG_ENDIAN);
1523         proto_tree_add_item(sbas_l1_mt18_tree, hf_sbas_l1_mt18_igp_mask_10e,     tvb, 20, 8, ENC_BIG_ENDIAN);
1524         proto_tree_add_item(sbas_l1_mt18_tree, hf_sbas_l1_mt18_igp_mask_15e,     tvb, 20, 8, ENC_BIG_ENDIAN);
1525     }
1526     else if (band_id == 5) {
1527         proto_tree_add_item(sbas_l1_mt18_tree, hf_sbas_l1_mt18_igp_mask_20e,     tvb,  2, 8, ENC_BIG_ENDIAN);
1528         proto_tree_add_item(sbas_l1_mt18_tree, hf_sbas_l1_mt18_igp_mask_25e,     tvb,  2, 8, ENC_BIG_ENDIAN);
1529         proto_tree_add_item(sbas_l1_mt18_tree, hf_sbas_l1_mt18_igp_mask_30e,     tvb,  8, 8, ENC_BIG_ENDIAN);
1530         proto_tree_add_item(sbas_l1_mt18_tree, hf_sbas_l1_mt18_igp_mask_35e,     tvb,  8, 8, ENC_BIG_ENDIAN);
1531         proto_tree_add_item(sbas_l1_mt18_tree, hf_sbas_l1_mt18_igp_mask_40e,     tvb, 14, 8, ENC_BIG_ENDIAN);
1532         proto_tree_add_item(sbas_l1_mt18_tree, hf_sbas_l1_mt18_igp_mask_45e,     tvb, 14, 8, ENC_BIG_ENDIAN);
1533         proto_tree_add_item(sbas_l1_mt18_tree, hf_sbas_l1_mt18_igp_mask_50e,     tvb, 20, 8, ENC_BIG_ENDIAN);
1534         proto_tree_add_item(sbas_l1_mt18_tree, hf_sbas_l1_mt18_igp_mask_55e,     tvb, 20, 8, ENC_BIG_ENDIAN);
1535     }
1536     else if (band_id == 6) {
1537         proto_tree_add_item(sbas_l1_mt18_tree, hf_sbas_l1_mt18_igp_mask_60e,     tvb,  2, 8, ENC_BIG_ENDIAN);
1538         proto_tree_add_item(sbas_l1_mt18_tree, hf_sbas_l1_mt18_igp_mask_65e,     tvb,  2, 8, ENC_BIG_ENDIAN);
1539         proto_tree_add_item(sbas_l1_mt18_tree, hf_sbas_l1_mt18_igp_mask_70e,     tvb,  8, 8, ENC_BIG_ENDIAN);
1540         proto_tree_add_item(sbas_l1_mt18_tree, hf_sbas_l1_mt18_igp_mask_75e,     tvb,  8, 8, ENC_BIG_ENDIAN);
1541         proto_tree_add_item(sbas_l1_mt18_tree, hf_sbas_l1_mt18_igp_mask_80e,     tvb, 14, 8, ENC_BIG_ENDIAN);
1542         proto_tree_add_item(sbas_l1_mt18_tree, hf_sbas_l1_mt18_igp_mask_85e,     tvb, 14, 8, ENC_BIG_ENDIAN);
1543         proto_tree_add_item(sbas_l1_mt18_tree, hf_sbas_l1_mt18_igp_mask_90e,     tvb, 20, 8, ENC_BIG_ENDIAN);
1544         proto_tree_add_item(sbas_l1_mt18_tree, hf_sbas_l1_mt18_igp_mask_95e,     tvb, 20, 8, ENC_BIG_ENDIAN);
1545     }
1546     else if (band_id == 7) {
1547         proto_tree_add_item(sbas_l1_mt18_tree, hf_sbas_l1_mt18_igp_mask_100e,    tvb,  2, 8, ENC_BIG_ENDIAN);
1548         proto_tree_add_item(sbas_l1_mt18_tree, hf_sbas_l1_mt18_igp_mask_105e,    tvb,  2, 8, ENC_BIG_ENDIAN);
1549         proto_tree_add_item(sbas_l1_mt18_tree, hf_sbas_l1_mt18_igp_mask_110e,    tvb,  8, 8, ENC_BIG_ENDIAN);
1550         proto_tree_add_item(sbas_l1_mt18_tree, hf_sbas_l1_mt18_igp_mask_115e,    tvb,  8, 8, ENC_BIG_ENDIAN);
1551         proto_tree_add_item(sbas_l1_mt18_tree, hf_sbas_l1_mt18_igp_mask_120e,    tvb, 14, 8, ENC_BIG_ENDIAN);
1552         proto_tree_add_item(sbas_l1_mt18_tree, hf_sbas_l1_mt18_igp_mask_125e,    tvb, 14, 8, ENC_BIG_ENDIAN);
1553         proto_tree_add_item(sbas_l1_mt18_tree, hf_sbas_l1_mt18_igp_mask_130e,    tvb, 20, 8, ENC_BIG_ENDIAN);
1554         proto_tree_add_item(sbas_l1_mt18_tree, hf_sbas_l1_mt18_igp_mask_135e,    tvb, 20, 8, ENC_BIG_ENDIAN);
1555     }
1556     else if (band_id == 8) {
1557         proto_tree_add_item(sbas_l1_mt18_tree, hf_sbas_l1_mt18_igp_mask_140e,    tvb,  2, 8, ENC_BIG_ENDIAN);
1558         proto_tree_add_item(sbas_l1_mt18_tree, hf_sbas_l1_mt18_igp_mask_145e,    tvb,  2, 8, ENC_BIG_ENDIAN);
1559         proto_tree_add_item(sbas_l1_mt18_tree, hf_sbas_l1_mt18_igp_mask_150e,    tvb,  8, 8, ENC_BIG_ENDIAN);
1560         proto_tree_add_item(sbas_l1_mt18_tree, hf_sbas_l1_mt18_igp_mask_155e,    tvb,  8, 8, ENC_BIG_ENDIAN);
1561         proto_tree_add_item(sbas_l1_mt18_tree, hf_sbas_l1_mt18_igp_mask_160e,    tvb, 14, 8, ENC_BIG_ENDIAN);
1562         proto_tree_add_item(sbas_l1_mt18_tree, hf_sbas_l1_mt18_igp_mask_165e,    tvb, 14, 8, ENC_BIG_ENDIAN);
1563         proto_tree_add_item(sbas_l1_mt18_tree, hf_sbas_l1_mt18_igp_mask_170e,    tvb, 20, 8, ENC_BIG_ENDIAN);
1564         proto_tree_add_item(sbas_l1_mt18_tree, hf_sbas_l1_mt18_igp_mask_175e,    tvb, 20, 8, ENC_BIG_ENDIAN);
1565     }
1566     else if (band_id == 9) {
1567         proto_tree_add_item(sbas_l1_mt18_tree, hf_sbas_l1_mt18_igp_mask_60n_1,   tvb,  2, 8, ENC_BIG_ENDIAN);
1568         proto_tree_add_item(sbas_l1_mt18_tree, hf_sbas_l1_mt18_igp_mask_60n_2,   tvb,  3, 8, ENC_BIG_ENDIAN);
1569         proto_tree_add_item(sbas_l1_mt18_tree, hf_sbas_l1_mt18_igp_mask_65n,     tvb, 11, 8, ENC_BIG_ENDIAN);
1570         proto_tree_add_item(sbas_l1_mt18_tree, hf_sbas_l1_mt18_igp_mask_70n,     tvb, 12, 8, ENC_BIG_ENDIAN);
1571         proto_tree_add_item(sbas_l1_mt18_tree, hf_sbas_l1_mt18_igp_mask_75n,     tvb, 20, 8, ENC_BIG_ENDIAN);
1572         proto_tree_add_item(sbas_l1_mt18_tree, hf_sbas_l1_mt18_igp_mask_85n,     tvb, 20, 8, ENC_BIG_ENDIAN);
1573     }
1574     else if (band_id == 10) {
1575         proto_tree_add_item(sbas_l1_mt18_tree, hf_sbas_l1_mt18_igp_mask_60s_1,   tvb,  2, 8, ENC_BIG_ENDIAN);
1576         proto_tree_add_item(sbas_l1_mt18_tree, hf_sbas_l1_mt18_igp_mask_60s_2,   tvb,  3, 8, ENC_BIG_ENDIAN);
1577         proto_tree_add_item(sbas_l1_mt18_tree, hf_sbas_l1_mt18_igp_mask_65s,     tvb, 11, 8, ENC_BIG_ENDIAN);
1578         proto_tree_add_item(sbas_l1_mt18_tree, hf_sbas_l1_mt18_igp_mask_70s,     tvb, 12, 8, ENC_BIG_ENDIAN);
1579         proto_tree_add_item(sbas_l1_mt18_tree, hf_sbas_l1_mt18_igp_mask_75s,     tvb, 20, 8, ENC_BIG_ENDIAN);
1580         proto_tree_add_item(sbas_l1_mt18_tree, hf_sbas_l1_mt18_igp_mask_85s,     tvb, 20, 8, ENC_BIG_ENDIAN);
1581     }
1582
1583     proto_tree_add_item(sbas_l1_mt18_tree,     hf_sbas_l1_mt18_spare,            tvb, 27, 1, ENC_NA);
1584
1585     return tvb_captured_length(tvb);
1586 }
1587
1588 /* Dissect SBAS L1 MT 24 */
1589 static int dissect_sbas_l1_mt24(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void *data _U_) {
1590     uint32_t velocity_code;
1591
1592     col_set_str(pinfo->cinfo, COL_PROTOCOL, "SBAS L1 MT24");
1593     col_clear(pinfo->cinfo, COL_INFO);
1594
1595     proto_item *ti = proto_tree_add_item(tree, hf_sbas_l1_mt24, tvb, 0, 32, ENC_NA);
1596     proto_tree *sbas_l1_mt24_tree = proto_item_add_subtree(ti, ett_sbas_l1_mt24);
1597
1598     proto_tree_add_item(sbas_l1_mt24_tree, hf_sbas_l1_mt24_fc_i1,     tvb, 0,  4, ENC_BIG_ENDIAN);
1599     proto_tree_add_item(sbas_l1_mt24_tree, hf_sbas_l1_mt24_fc_i2,     tvb, 2,  4, ENC_BIG_ENDIAN);
1600     proto_tree_add_item(sbas_l1_mt24_tree, hf_sbas_l1_mt24_fc_i3,     tvb, 3,  4, ENC_BIG_ENDIAN);
1601     proto_tree_add_item(sbas_l1_mt24_tree, hf_sbas_l1_mt24_fc_i4,     tvb, 5,  4, ENC_BIG_ENDIAN);
1602     proto_tree_add_item(sbas_l1_mt24_tree, hf_sbas_l1_mt24_fc_i5,     tvb, 6,  4, ENC_BIG_ENDIAN);
1603     proto_tree_add_item(sbas_l1_mt24_tree, hf_sbas_l1_mt24_fc_i6,     tvb, 8,  4, ENC_BIG_ENDIAN);
1604     proto_tree_add_item(sbas_l1_mt24_tree, hf_sbas_l1_mt24_udrei_i1,  tvb, 9,  2, ENC_BIG_ENDIAN);
1605     proto_tree_add_item(sbas_l1_mt24_tree, hf_sbas_l1_mt24_udrei_i2,  tvb, 10, 2, ENC_BIG_ENDIAN);
1606     proto_tree_add_item(sbas_l1_mt24_tree, hf_sbas_l1_mt24_udrei_i3,  tvb, 10, 2, ENC_BIG_ENDIAN);
1607     proto_tree_add_item(sbas_l1_mt24_tree, hf_sbas_l1_mt24_udrei_i4,  tvb, 11, 2, ENC_BIG_ENDIAN);
1608     proto_tree_add_item(sbas_l1_mt24_tree, hf_sbas_l1_mt24_udrei_i5,  tvb, 11, 2, ENC_BIG_ENDIAN);
1609     proto_tree_add_item(sbas_l1_mt24_tree, hf_sbas_l1_mt24_udrei_i6,  tvb, 12, 2, ENC_BIG_ENDIAN);
1610     proto_tree_add_item(sbas_l1_mt24_tree, hf_sbas_l1_mt24_iodp,      tvb, 12, 1, ENC_NA);
1611     proto_tree_add_item(sbas_l1_mt24_tree, hf_sbas_l1_mt24_fc_type,   tvb, 13, 1, ENC_NA);
1612     proto_tree_add_item(sbas_l1_mt24_tree, hf_sbas_l1_mt24_iodf_j,    tvb, 13, 1, ENC_NA);
1613     proto_tree_add_item(sbas_l1_mt24_tree, hf_sbas_l1_mt24_spare,     tvb, 13, 1, ENC_NA);
1614
1615     proto_tree_add_item_ret_uint(sbas_l1_mt24_tree, hf_sbas_l1_mt24_velocity_code, tvb, 14, 1, ENC_NA, &velocity_code);
1616
1617     if (velocity_code == 0) {
1618         proto_tree_add_item(sbas_l1_mt24_tree, hf_sbas_l1_mt24_v0_prn_mask_nr_1, tvb, 14, 1, ENC_NA);
1619         proto_tree_add_item(sbas_l1_mt24_tree, hf_sbas_l1_mt24_v0_iod_1,         tvb, 14, 2, ENC_BIG_ENDIAN);
1620         proto_tree_add_item(sbas_l1_mt24_tree, hf_sbas_l1_mt24_v0_delta_x_1,     tvb, 15, 2, ENC_BIG_ENDIAN);
1621         proto_tree_add_item(sbas_l1_mt24_tree, hf_sbas_l1_mt24_v0_delta_y_1,     tvb, 17, 2, ENC_BIG_ENDIAN);
1622         proto_tree_add_item(sbas_l1_mt24_tree, hf_sbas_l1_mt24_v0_delta_z_1,     tvb, 18, 2, ENC_BIG_ENDIAN);
1623         proto_tree_add_item(sbas_l1_mt24_tree, hf_sbas_l1_mt24_v0_delta_a_1_f0,  tvb, 19, 2, ENC_BIG_ENDIAN);
1624
1625         proto_tree_add_item(sbas_l1_mt24_tree, hf_sbas_l1_mt24_v0_prn_mask_nr_2, tvb, 20, 2, ENC_BIG_ENDIAN);
1626         proto_tree_add_item(sbas_l1_mt24_tree, hf_sbas_l1_mt24_v0_iod_2,         tvb, 21, 2, ENC_BIG_ENDIAN);
1627         proto_tree_add_item(sbas_l1_mt24_tree, hf_sbas_l1_mt24_v0_delta_x_2,     tvb, 22, 2, ENC_BIG_ENDIAN);
1628         proto_tree_add_item(sbas_l1_mt24_tree, hf_sbas_l1_mt24_v0_delta_y_2,     tvb, 23, 2, ENC_BIG_ENDIAN);
1629         proto_tree_add_item(sbas_l1_mt24_tree, hf_sbas_l1_mt24_v0_delta_z_2,     tvb, 24, 2, ENC_BIG_ENDIAN);
1630         proto_tree_add_item(sbas_l1_mt24_tree, hf_sbas_l1_mt24_v0_delta_a_2_f0,  tvb, 25, 2, ENC_BIG_ENDIAN);
1631         proto_tree_add_item(sbas_l1_mt24_tree, hf_sbas_l1_mt24_v0_iodp,          tvb, 26, 2, ENC_BIG_ENDIAN);
1632         proto_tree_add_item(sbas_l1_mt24_tree, hf_sbas_l1_mt24_v0_spare,         tvb, 27, 1, ENC_NA);
1633     }
1634     else {
1635         proto_tree_add_item(sbas_l1_mt24_tree, hf_sbas_l1_mt24_v1_prn_mask_nr, tvb, 14, 1, ENC_NA);
1636         proto_tree_add_item(sbas_l1_mt24_tree, hf_sbas_l1_mt24_v1_iod,         tvb, 14, 2, ENC_BIG_ENDIAN);
1637         proto_tree_add_item(sbas_l1_mt24_tree, hf_sbas_l1_mt24_v1_delta_x,     tvb, 15, 4, ENC_BIG_ENDIAN);
1638         proto_tree_add_item(sbas_l1_mt24_tree, hf_sbas_l1_mt24_v1_delta_y,     tvb, 17, 4, ENC_BIG_ENDIAN);
1639         proto_tree_add_item(sbas_l1_mt24_tree, hf_sbas_l1_mt24_v1_delta_z,     tvb, 18, 4, ENC_BIG_ENDIAN);
1640         proto_tree_add_item(sbas_l1_mt24_tree, hf_sbas_l1_mt24_v1_delta_a_f0,  tvb, 20, 4, ENC_BIG_ENDIAN);
1641         proto_tree_add_item(sbas_l1_mt24_tree, hf_sbas_l1_mt24_v1_delta_x_vel, tvb, 21, 4, ENC_BIG_ENDIAN);
1642         proto_tree_add_item(sbas_l1_mt24_tree, hf_sbas_l1_mt24_v1_delta_y_vel, tvb, 22, 4, ENC_BIG_ENDIAN);
1643         proto_tree_add_item(sbas_l1_mt24_tree, hf_sbas_l1_mt24_v1_delta_z_vel, tvb, 23, 4, ENC_BIG_ENDIAN);
1644         proto_tree_add_item(sbas_l1_mt24_tree, hf_sbas_l1_mt24_v1_delta_a_f1,  tvb, 24, 4, ENC_BIG_ENDIAN);
1645         proto_tree_add_item(sbas_l1_mt24_tree, hf_sbas_l1_mt24_v1_t_lt,        tvb, 25, 2, ENC_BIG_ENDIAN);
1646         proto_tree_add_item(sbas_l1_mt24_tree, hf_sbas_l1_mt24_v1_iodp,        tvb, 27, 1, ENC_NA);
1647     }
1648
1649     return tvb_captured_length(tvb);
1650 }
1651
1652 /* Dissect SBAS L1 MT 25 */
1653 static int dissect_sbas_l1_mt25(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void *data _U_) {
1654     uint32_t velocity_code;
1655
1656     col_set_str(pinfo->cinfo, COL_PROTOCOL, "SBAS L1 MT25");
1657     col_clear(pinfo->cinfo, COL_INFO);
1658
1659     proto_item *ti = proto_tree_add_item(tree, hf_sbas_l1_mt25, tvb, 0, 32, ENC_NA);
1660     proto_tree *sbas_l1_mt25_tree = proto_item_add_subtree(ti, ett_sbas_l1_mt25);
1661
1662     // first half message
1663     proto_tree_add_item_ret_uint(sbas_l1_mt25_tree, hf_sbas_l1_mt25_h1_velocity_code,
1664             tvb, 0, 1, ENC_NA, &velocity_code);
1665     if (velocity_code == 0) {
1666         proto_tree_add_item(sbas_l1_mt25_tree, hf_sbas_l1_mt25_h1_v0_prn_mask_nr_1,
1667                 tvb, 0, 2, ENC_BIG_ENDIAN);
1668         proto_tree_add_item(sbas_l1_mt25_tree, hf_sbas_l1_mt25_h1_v0_iod_1,
1669                 tvb, 1, 2, ENC_BIG_ENDIAN);
1670         proto_tree_add_item(sbas_l1_mt25_tree, hf_sbas_l1_mt25_h1_v0_delta_x_1,
1671                 tvb, 2, 2, ENC_BIG_ENDIAN);
1672         proto_tree_add_item(sbas_l1_mt25_tree, hf_sbas_l1_mt25_h1_v0_delta_y_1,
1673                 tvb, 3, 2, ENC_BIG_ENDIAN);
1674         proto_tree_add_item(sbas_l1_mt25_tree, hf_sbas_l1_mt25_h1_v0_delta_z_1,
1675                 tvb, 4, 2, ENC_BIG_ENDIAN);
1676         proto_tree_add_item(sbas_l1_mt25_tree, hf_sbas_l1_mt25_h1_v0_delta_a_1_f0,
1677                 tvb, 6, 2, ENC_BIG_ENDIAN);
1678
1679         proto_tree_add_item(sbas_l1_mt25_tree, hf_sbas_l1_mt25_h1_v0_prn_mask_nr_2,
1680                 tvb, 7, 1, ENC_NA);
1681         proto_tree_add_item(sbas_l1_mt25_tree, hf_sbas_l1_mt25_h1_v0_iod_2,
1682                 tvb, 8, 1, ENC_NA);
1683         proto_tree_add_item(sbas_l1_mt25_tree, hf_sbas_l1_mt25_h1_v0_delta_x_2,
1684                 tvb, 9, 2, ENC_BIG_ENDIAN);
1685         proto_tree_add_item(sbas_l1_mt25_tree, hf_sbas_l1_mt25_h1_v0_delta_y_2,
1686                 tvb, 10, 2, ENC_BIG_ENDIAN);
1687         proto_tree_add_item(sbas_l1_mt25_tree, hf_sbas_l1_mt25_h1_v0_delta_z_2,
1688                 tvb, 11, 2, ENC_BIG_ENDIAN);
1689         proto_tree_add_item(sbas_l1_mt25_tree, hf_sbas_l1_mt25_h1_v0_delta_a_2_f0,
1690                 tvb, 12, 2, ENC_BIG_ENDIAN);
1691         proto_tree_add_item(sbas_l1_mt25_tree, hf_sbas_l1_mt25_h1_v0_iodp,
1692                 tvb, 13, 1, ENC_NA);
1693         proto_tree_add_item(sbas_l1_mt25_tree, hf_sbas_l1_mt25_h1_v0_spare,
1694                 tvb, 13, 1, ENC_NA);
1695     }
1696     else { // velocity_code == 1
1697         proto_tree_add_item(sbas_l1_mt25_tree, hf_sbas_l1_mt25_h1_v1_prn_mask_nr,
1698                 tvb, 0, 2, ENC_BIG_ENDIAN);
1699         proto_tree_add_item(sbas_l1_mt25_tree, hf_sbas_l1_mt25_h1_v1_iod,
1700                 tvb, 1, 2, ENC_BIG_ENDIAN);
1701         proto_tree_add_item(sbas_l1_mt25_tree, hf_sbas_l1_mt25_h1_v1_delta_x,
1702                 tvb, 2, 4, ENC_BIG_ENDIAN);
1703         proto_tree_add_item(sbas_l1_mt25_tree, hf_sbas_l1_mt25_h1_v1_delta_y,
1704                 tvb, 4, 4, ENC_BIG_ENDIAN);
1705         proto_tree_add_item(sbas_l1_mt25_tree, hf_sbas_l1_mt25_h1_v1_delta_z,
1706                 tvb, 5, 4, ENC_BIG_ENDIAN);
1707         proto_tree_add_item(sbas_l1_mt25_tree, hf_sbas_l1_mt25_h1_v1_delta_a_f0,
1708                 tvb, 6, 4, ENC_BIG_ENDIAN);
1709         proto_tree_add_item(sbas_l1_mt25_tree, hf_sbas_l1_mt25_h1_v1_delta_x_vel,
1710                 tvb, 8, 4, ENC_BIG_ENDIAN);
1711         proto_tree_add_item(sbas_l1_mt25_tree, hf_sbas_l1_mt25_h1_v1_delta_y_vel,
1712                 tvb, 9, 4, ENC_BIG_ENDIAN);
1713         proto_tree_add_item(sbas_l1_mt25_tree, hf_sbas_l1_mt25_h1_v1_delta_z_vel,
1714                 tvb, 10, 4, ENC_BIG_ENDIAN);
1715         proto_tree_add_item(sbas_l1_mt25_tree, hf_sbas_l1_mt25_h1_v1_delta_a_f1,
1716                 tvb, 11, 4, ENC_BIG_ENDIAN);
1717         proto_tree_add_item(sbas_l1_mt25_tree, hf_sbas_l1_mt25_h1_v1_t_lt,
1718                 tvb, 12, 2, ENC_BIG_ENDIAN);
1719         proto_tree_add_item(sbas_l1_mt25_tree, hf_sbas_l1_mt25_h1_v1_iodp,
1720                 tvb, 13, 1, ENC_NA);
1721     }
1722
1723     // second half message
1724     proto_tree_add_item_ret_uint(sbas_l1_mt25_tree, hf_sbas_l1_mt25_h2_velocity_code,
1725             tvb, 14, 1, ENC_NA, &velocity_code);
1726     if (velocity_code == 0) {
1727         proto_tree_add_item(sbas_l1_mt25_tree, hf_sbas_l1_mt25_h2_v0_prn_mask_nr_1,
1728                 tvb, 14, 1, ENC_NA);
1729         proto_tree_add_item(sbas_l1_mt25_tree, hf_sbas_l1_mt25_h2_v0_iod_1,
1730                 tvb, 14, 2, ENC_BIG_ENDIAN);
1731         proto_tree_add_item(sbas_l1_mt25_tree, hf_sbas_l1_mt25_h2_v0_delta_x_1,
1732                 tvb, 15, 2, ENC_BIG_ENDIAN);
1733         proto_tree_add_item(sbas_l1_mt25_tree, hf_sbas_l1_mt25_h2_v0_delta_y_1,
1734                 tvb, 17, 2, ENC_BIG_ENDIAN);
1735         proto_tree_add_item(sbas_l1_mt25_tree, hf_sbas_l1_mt25_h2_v0_delta_z_1,
1736                 tvb, 18, 2, ENC_BIG_ENDIAN);
1737         proto_tree_add_item(sbas_l1_mt25_tree, hf_sbas_l1_mt25_h2_v0_delta_a_1_f0,
1738                 tvb, 19, 2, ENC_BIG_ENDIAN);
1739
1740         proto_tree_add_item(sbas_l1_mt25_tree, hf_sbas_l1_mt25_h2_v0_prn_mask_nr_2,
1741                 tvb, 20, 2, ENC_BIG_ENDIAN);
1742         proto_tree_add_item(sbas_l1_mt25_tree, hf_sbas_l1_mt25_h2_v0_iod_2,
1743                 tvb, 21, 2, ENC_BIG_ENDIAN);
1744         proto_tree_add_item(sbas_l1_mt25_tree, hf_sbas_l1_mt25_h2_v0_delta_x_2,
1745                 tvb, 22, 2, ENC_BIG_ENDIAN);
1746         proto_tree_add_item(sbas_l1_mt25_tree, hf_sbas_l1_mt25_h2_v0_delta_y_2,
1747                 tvb, 23, 2, ENC_BIG_ENDIAN);
1748         proto_tree_add_item(sbas_l1_mt25_tree, hf_sbas_l1_mt25_h2_v0_delta_z_2,
1749                 tvb, 24, 2, ENC_BIG_ENDIAN);
1750         proto_tree_add_item(sbas_l1_mt25_tree, hf_sbas_l1_mt25_h2_v0_delta_a_2_f0,
1751                 tvb, 25, 2, ENC_BIG_ENDIAN);
1752         proto_tree_add_item(sbas_l1_mt25_tree, hf_sbas_l1_mt25_h2_v0_iodp,
1753                 tvb, 26, 2, ENC_BIG_ENDIAN);
1754         proto_tree_add_item(sbas_l1_mt25_tree, hf_sbas_l1_mt25_h2_v0_spare,
1755                 tvb, 27, 1, ENC_NA);
1756     }
1757     else { // velocity_code == 1
1758         proto_tree_add_item(sbas_l1_mt25_tree, hf_sbas_l1_mt25_h2_v1_prn_mask_nr,
1759                 tvb, 14, 1, ENC_NA);
1760         proto_tree_add_item(sbas_l1_mt25_tree, hf_sbas_l1_mt25_h2_v1_iod,
1761                 tvb, 14, 2, ENC_BIG_ENDIAN);
1762         proto_tree_add_item(sbas_l1_mt25_tree, hf_sbas_l1_mt25_h2_v1_delta_x,
1763                 tvb, 15, 4, ENC_BIG_ENDIAN);
1764         proto_tree_add_item(sbas_l1_mt25_tree, hf_sbas_l1_mt25_h2_v1_delta_y,
1765                 tvb, 17, 4, ENC_BIG_ENDIAN);
1766         proto_tree_add_item(sbas_l1_mt25_tree, hf_sbas_l1_mt25_h2_v1_delta_z,
1767                 tvb, 18, 4, ENC_BIG_ENDIAN);
1768         proto_tree_add_item(sbas_l1_mt25_tree, hf_sbas_l1_mt25_h2_v1_delta_a_f0,
1769                 tvb, 20, 4, ENC_BIG_ENDIAN);
1770         proto_tree_add_item(sbas_l1_mt25_tree, hf_sbas_l1_mt25_h2_v1_delta_x_vel,
1771                 tvb, 21, 4, ENC_BIG_ENDIAN);
1772         proto_tree_add_item(sbas_l1_mt25_tree, hf_sbas_l1_mt25_h2_v1_delta_y_vel,
1773                 tvb, 22, 4, ENC_BIG_ENDIAN);
1774         proto_tree_add_item(sbas_l1_mt25_tree, hf_sbas_l1_mt25_h2_v1_delta_z_vel,
1775                 tvb, 23, 4, ENC_BIG_ENDIAN);
1776         proto_tree_add_item(sbas_l1_mt25_tree, hf_sbas_l1_mt25_h2_v1_delta_a_f1,
1777                 tvb, 24, 4, ENC_BIG_ENDIAN);
1778         proto_tree_add_item(sbas_l1_mt25_tree, hf_sbas_l1_mt25_h2_v1_t_lt,
1779                 tvb, 25, 2, ENC_BIG_ENDIAN);
1780         proto_tree_add_item(sbas_l1_mt25_tree, hf_sbas_l1_mt25_h2_v1_iodp,
1781                 tvb, 27, 1, ENC_NA);
1782     }
1783
1784     return tvb_captured_length(tvb);
1785 }
1786
1787 /* Dissect SBAS L1 MT 26 */
1788 static int dissect_sbas_l1_mt26(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void *data _U_) {
1789     col_set_str(pinfo->cinfo, COL_PROTOCOL, "SBAS L1 MT26");
1790     col_clear(pinfo->cinfo, COL_INFO);
1791
1792     proto_item *ti = proto_tree_add_item(tree, hf_sbas_l1_mt26, tvb, 0, 32, ENC_NA);
1793     proto_tree *sbas_l1_mt26_tree = proto_item_add_subtree(ti, ett_sbas_l1_mt26);
1794
1795     uint32_t igp_band_id;
1796     proto_item* pi_igp_band_id = proto_tree_add_item_ret_uint(sbas_l1_mt26_tree, hf_sbas_l1_mt26_igp_band_id,
1797             tvb, 0, 2, ENC_BIG_ENDIAN, &igp_band_id);
1798     if (igp_band_id > 10) {
1799         expert_add_info_format(pinfo, pi_igp_band_id, &ei_sbas_l1_mt26_igp_band_id, "Invalid IGP Band Identifier");
1800     }
1801
1802     uint32_t igp_block_id;
1803     proto_item* pi_igp_block_id = proto_tree_add_item_ret_uint(sbas_l1_mt26_tree, hf_sbas_l1_mt26_igp_block_id,
1804             tvb, 1, 1, ENC_NA, &igp_block_id);
1805     if (igp_block_id > 13) {
1806         expert_add_info_format(pinfo, pi_igp_block_id, &ei_sbas_l1_mt26_igp_block_id, "Invalid IGP Block Identifier");
1807     }
1808
1809     proto_tree_add_item(sbas_l1_mt26_tree, hf_sbas_l1_mt26_igp_vertical_delay_est_1, tvb, 1, 2, ENC_BIG_ENDIAN);
1810     proto_tree_add_item(sbas_l1_mt26_tree, hf_sbas_l1_mt26_givei_1, tvb, 2, 2, ENC_BIG_ENDIAN);
1811     proto_tree_add_item(sbas_l1_mt26_tree, hf_sbas_l1_mt26_igp_vertical_delay_est_2, tvb, 3, 2, ENC_BIG_ENDIAN);
1812     proto_tree_add_item(sbas_l1_mt26_tree, hf_sbas_l1_mt26_givei_2, tvb, 4, 2, ENC_BIG_ENDIAN);
1813     proto_tree_add_item(sbas_l1_mt26_tree, hf_sbas_l1_mt26_igp_vertical_delay_est_3, tvb, 5, 2, ENC_BIG_ENDIAN);
1814     proto_tree_add_item(sbas_l1_mt26_tree, hf_sbas_l1_mt26_givei_3, tvb, 6, 2, ENC_BIG_ENDIAN);
1815     proto_tree_add_item(sbas_l1_mt26_tree, hf_sbas_l1_mt26_igp_vertical_delay_est_4, tvb, 6, 2, ENC_BIG_ENDIAN);
1816     proto_tree_add_item(sbas_l1_mt26_tree, hf_sbas_l1_mt26_givei_4, tvb, 7, 2, ENC_BIG_ENDIAN);
1817     proto_tree_add_item(sbas_l1_mt26_tree, hf_sbas_l1_mt26_igp_vertical_delay_est_5, tvb, 8, 2, ENC_BIG_ENDIAN);
1818     proto_tree_add_item(sbas_l1_mt26_tree, hf_sbas_l1_mt26_givei_5, tvb, 9, 2, ENC_BIG_ENDIAN);
1819     proto_tree_add_item(sbas_l1_mt26_tree, hf_sbas_l1_mt26_igp_vertical_delay_est_6, tvb, 9, 2, ENC_BIG_ENDIAN);
1820     proto_tree_add_item(sbas_l1_mt26_tree, hf_sbas_l1_mt26_givei_6, tvb, 11, 2, ENC_BIG_ENDIAN);
1821     proto_tree_add_item(sbas_l1_mt26_tree, hf_sbas_l1_mt26_igp_vertical_delay_est_7, tvb, 11, 2, ENC_BIG_ENDIAN);
1822     proto_tree_add_item(sbas_l1_mt26_tree, hf_sbas_l1_mt26_givei_7, tvb, 12, 2, ENC_BIG_ENDIAN);
1823     proto_tree_add_item(sbas_l1_mt26_tree, hf_sbas_l1_mt26_igp_vertical_delay_est_8, tvb, 13, 2, ENC_BIG_ENDIAN);
1824     proto_tree_add_item(sbas_l1_mt26_tree, hf_sbas_l1_mt26_givei_8, tvb, 14, 2, ENC_BIG_ENDIAN);
1825     proto_tree_add_item(sbas_l1_mt26_tree, hf_sbas_l1_mt26_igp_vertical_delay_est_9, tvb, 14, 2, ENC_BIG_ENDIAN);
1826     proto_tree_add_item(sbas_l1_mt26_tree, hf_sbas_l1_mt26_givei_9, tvb, 15, 2, ENC_BIG_ENDIAN);
1827     proto_tree_add_item(sbas_l1_mt26_tree, hf_sbas_l1_mt26_igp_vertical_delay_est_10, tvb, 16, 2, ENC_BIG_ENDIAN);
1828     proto_tree_add_item(sbas_l1_mt26_tree, hf_sbas_l1_mt26_givei_10, tvb, 17, 2, ENC_BIG_ENDIAN);
1829     proto_tree_add_item(sbas_l1_mt26_tree, hf_sbas_l1_mt26_igp_vertical_delay_est_11, tvb, 18, 2, ENC_BIG_ENDIAN);
1830     proto_tree_add_item(sbas_l1_mt26_tree, hf_sbas_l1_mt26_givei_11, tvb, 19, 2, ENC_BIG_ENDIAN);
1831     proto_tree_add_item(sbas_l1_mt26_tree, hf_sbas_l1_mt26_igp_vertical_delay_est_12, tvb, 19, 2, ENC_BIG_ENDIAN);
1832     proto_tree_add_item(sbas_l1_mt26_tree, hf_sbas_l1_mt26_givei_12, tvb, 20, 2, ENC_BIG_ENDIAN);
1833     proto_tree_add_item(sbas_l1_mt26_tree, hf_sbas_l1_mt26_igp_vertical_delay_est_13, tvb, 21, 2, ENC_BIG_ENDIAN);
1834     proto_tree_add_item(sbas_l1_mt26_tree, hf_sbas_l1_mt26_givei_13, tvb, 22, 2, ENC_BIG_ENDIAN);
1835     proto_tree_add_item(sbas_l1_mt26_tree, hf_sbas_l1_mt26_igp_vertical_delay_est_14, tvb, 22, 2, ENC_BIG_ENDIAN);
1836     proto_tree_add_item(sbas_l1_mt26_tree, hf_sbas_l1_mt26_givei_14, tvb, 24, 2, ENC_BIG_ENDIAN);
1837     proto_tree_add_item(sbas_l1_mt26_tree, hf_sbas_l1_mt26_igp_vertical_delay_est_15, tvb, 24, 2, ENC_BIG_ENDIAN);
1838     proto_tree_add_item(sbas_l1_mt26_tree, hf_sbas_l1_mt26_givei_15, tvb, 25, 2, ENC_BIG_ENDIAN);
1839     proto_tree_add_item(sbas_l1_mt26_tree, hf_sbas_l1_mt26_iodi_k, tvb, 26, 1, ENC_NA);
1840     proto_tree_add_item(sbas_l1_mt26_tree, hf_sbas_l1_mt26_spare, tvb, 26, 2, ENC_BIG_ENDIAN);
1841
1842     return tvb_captured_length(tvb);
1843 }
1844
1845 /* Dissect SBAS L1 MT 27 */
1846 static int dissect_sbas_l1_mt27(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void *data _U_) {
1847     col_set_str(pinfo->cinfo, COL_PROTOCOL, "SBAS L1 MT27");
1848     col_clear(pinfo->cinfo, COL_INFO);
1849
1850     proto_item *ti = proto_tree_add_item(tree, hf_sbas_l1_mt27, tvb, 0, 32, ENC_NA);
1851     proto_tree *sbas_l1_mt27_tree = proto_item_add_subtree(ti, ett_sbas_l1_mt27);
1852
1853     proto_tree_add_item(sbas_l1_mt27_tree, hf_sbas_l1_mt27_iods,         tvb, 0, 2, ENC_BIG_ENDIAN);
1854     proto_tree_add_item(sbas_l1_mt27_tree, hf_sbas_l1_mt27_num_svc_msgs, tvb, 1, 2, ENC_BIG_ENDIAN);
1855     proto_tree_add_item(sbas_l1_mt27_tree, hf_sbas_l1_mt27_svc_msg_num,  tvb, 1, 2, ENC_BIG_ENDIAN);
1856     proto_tree_add_item(sbas_l1_mt27_tree, hf_sbas_l1_mt27_num_regions,  tvb, 1, 2, ENC_BIG_ENDIAN);
1857     proto_tree_add_item(sbas_l1_mt27_tree, hf_sbas_l1_mt27_prio_code,    tvb, 1, 2, ENC_BIG_ENDIAN);
1858     proto_tree_add_item(sbas_l1_mt27_tree, hf_sbas_l1_mt27_dudre_in,     tvb, 1, 2, ENC_BIG_ENDIAN);
1859     proto_tree_add_item(sbas_l1_mt27_tree, hf_sbas_l1_mt27_dudre_out,    tvb, 3, 2, ENC_BIG_ENDIAN);
1860
1861     proto_tree_add_bitmask(sbas_l1_mt27_tree, tvb,  3, hf_sbas_l1_mt27_region[0], ett_sbas_l1_mt27_region[0], sbas_l1_mt27_region_fields[0], ENC_BIG_ENDIAN);
1862     proto_tree_add_bitmask(sbas_l1_mt27_tree, tvb,  7, hf_sbas_l1_mt27_region[1], ett_sbas_l1_mt27_region[1], sbas_l1_mt27_region_fields[1], ENC_BIG_ENDIAN);
1863     proto_tree_add_bitmask(sbas_l1_mt27_tree, tvb, 12, hf_sbas_l1_mt27_region[2], ett_sbas_l1_mt27_region[2], sbas_l1_mt27_region_fields[2], ENC_BIG_ENDIAN);
1864     proto_tree_add_bitmask(sbas_l1_mt27_tree, tvb, 16, hf_sbas_l1_mt27_region[3], ett_sbas_l1_mt27_region[3], sbas_l1_mt27_region_fields[3], ENC_BIG_ENDIAN);
1865     proto_tree_add_bitmask(sbas_l1_mt27_tree, tvb, 20, hf_sbas_l1_mt27_region[4], ett_sbas_l1_mt27_region[4], sbas_l1_mt27_region_fields[4], ENC_BIG_ENDIAN);
1866
1867     proto_tree_add_item(sbas_l1_mt27_tree, hf_sbas_l1_mt27_spare,        tvb, 24, 4, ENC_BIG_ENDIAN);
1868
1869     return tvb_captured_length(tvb);
1870 }
1871
1872 /* Dissect SBAS L1 MT 63 */
1873 static int dissect_sbas_l1_mt63(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void *data _U_) {
1874     col_set_str(pinfo->cinfo, COL_PROTOCOL, "SBAS L1 MT63");
1875     col_clear(pinfo->cinfo, COL_INFO);
1876
1877     proto_item *ti = proto_tree_add_item(tree, hf_sbas_l1_mt63, tvb, 0, 32, ENC_NA);
1878     proto_tree *sbas_l1_mt63_tree = proto_item_add_subtree(ti, ett_sbas_l1_mt63);
1879
1880     proto_tree_add_item(sbas_l1_mt63_tree, hf_sbas_l1_mt63_spare_1, tvb,  0,  1, ENC_NA);
1881     proto_tree_add_item(sbas_l1_mt63_tree, hf_sbas_l1_mt63_spare_2, tvb,  1, 26, ENC_NA);
1882     proto_tree_add_item(sbas_l1_mt63_tree, hf_sbas_l1_mt63_spare_3, tvb, 27,  1, ENC_NA);
1883
1884     return tvb_captured_length(tvb);
1885 }
1886
1887 void proto_register_sbas_l1(void) {
1888
1889     static hf_register_info hf[] = {
1890         {&hf_sbas_l1_preamble, {"Preamble",     "sbas_l1.preamble", FT_UINT8,  BASE_HEX, NULL, 0xff,       NULL, HFILL}},
1891         {&hf_sbas_l1_mt,       {"Message Type", "sbas_l1.mt"      , FT_UINT8,  BASE_DEC, NULL, 0xfc,       NULL, HFILL}},
1892         {&hf_sbas_l1_chksum,   {"Checksum",     "sbas_l1.chksum"  , FT_UINT32, BASE_HEX, NULL, 0x3fffffc0, NULL, HFILL}},
1893
1894         // MT0
1895         {&hf_sbas_l1_mt0,         {"MT0",     "sbas_l1.mt0",         FT_NONE,  BASE_NONE, NULL, 0x00, NULL, HFILL}},
1896         {&hf_sbas_l1_mt0_spare_1, {"Spare 1", "sbas_l1.mt0.spare_1", FT_UINT8, BASE_HEX,  NULL, 0x03, NULL, HFILL}},
1897         {&hf_sbas_l1_mt0_spare_2, {"Spare 2", "sbas_l1.mt0.spare_2", FT_BYTES, SEP_SPACE, NULL, 0x00, NULL, HFILL}},
1898         {&hf_sbas_l1_mt0_spare_3, {"Spare 3", "sbas_l1.mt0.spare_3", FT_UINT8, BASE_HEX,  NULL, 0xc0, NULL, HFILL}},
1899
1900         // MT1
1901         {&hf_sbas_l1_mt1,                  {"MT1",                        "sbas_l1.mt1",                  FT_NONE,   BASE_NONE, NULL, 0x0,                          NULL, HFILL}},
1902         {&hf_sbas_l1_mt1_prn_mask_gps,     {"PRN Mask GPS",               "sbas_l1.mt1.prn_mask_gps",     FT_UINT64, BASE_HEX,  NULL, UINT64_C(0x03ffffffffe00000), NULL, HFILL}},
1903         {&hf_sbas_l1_mt1_prn_mask_glonass, {"PRN Mask Glonass",           "sbas_l1.mt1.prn_mask_glonass", FT_UINT64, BASE_HEX,  NULL, UINT64_C(0x1fffffe000000000), NULL, HFILL}},
1904         {&hf_sbas_l1_mt1_prn_mask_spare_1, {"PRN Mask spare",             "sbas_l1.mt1.prn_mask_spare_1", FT_UINT64, BASE_HEX,  NULL, UINT64_C(0x1ffffffffffffff8), NULL, HFILL}},
1905         {&hf_sbas_l1_mt1_prn_mask_sbas,    {"PRN Mask SBAS",              "sbas_l1.mt1.prn_mask_sbas",    FT_UINT64, BASE_HEX,  NULL, UINT64_C(0x07fffffffff00000), NULL, HFILL}},
1906         {&hf_sbas_l1_mt1_prn_mask_spare_2, {"PRN Mask spare",             "sbas_l1.mt1.prn_mask_spare_2", FT_UINT64, BASE_HEX,  NULL, UINT64_C(0x0fffffffffffff00), NULL, HFILL}},
1907         {&hf_sbas_l1_mt1_iodp,             {"Issue of Data - PRN (IODP)", "sbas_l1.mt1.iodp",             FT_UINT8,  BASE_DEC,  NULL, 0xc0,                         NULL, HFILL}},
1908
1909         // MT2
1910         {&hf_sbas_l1_mt2,          {"MT2",                                      "sbas_l1.mt2",          FT_NONE,   BASE_NONE,   NULL,                          0x0,        NULL, HFILL}},
1911         {&hf_sbas_l1_mt2_iodf_2,   {"Issue of Data - Fast Correction (IODF_2)", "sbas_l1.mt2.iodf_2",   FT_UINT8,  BASE_DEC,    NULL,                          0x03,       NULL, HFILL}},
1912         {&hf_sbas_l1_mt2_iodp,     {"Issue of Data - PRN (IODP)",               "sbas_l1.mt2.iodp",     FT_UINT8,  BASE_DEC,    NULL,                          0xc0,       NULL, HFILL}},
1913         {&hf_sbas_l1_mt2_fc_1,     {"Fast Correction Satellite 1 (FC_1)",       "sbas_l1.mt2.fc_1",     FT_INT32,  BASE_CUSTOM, CF_FUNC(&fmt_correction_125m), 0x3ffc0000, NULL, HFILL}},
1914         {&hf_sbas_l1_mt2_fc_2,     {"Fast Correction Satellite 2 (FC_2)",       "sbas_l1.mt2.fc_2",     FT_INT32,  BASE_CUSTOM, CF_FUNC(&fmt_correction_125m), 0x03ffc000, NULL, HFILL}},
1915         {&hf_sbas_l1_mt2_fc_3,     {"Fast Correction Satellite 3 (FC_3)",       "sbas_l1.mt2.fc_3",     FT_INT32,  BASE_CUSTOM, CF_FUNC(&fmt_correction_125m), 0x3ffc0000, NULL, HFILL}},
1916         {&hf_sbas_l1_mt2_fc_4,     {"Fast Correction Satellite 4 (FC_4)",       "sbas_l1.mt2.fc_4",     FT_INT32,  BASE_CUSTOM, CF_FUNC(&fmt_correction_125m), 0x03ffc000, NULL, HFILL}},
1917         {&hf_sbas_l1_mt2_fc_5,     {"Fast Correction Satellite 5 (FC_5)",       "sbas_l1.mt2.fc_5",     FT_INT32,  BASE_CUSTOM, CF_FUNC(&fmt_correction_125m), 0x3ffc0000, NULL, HFILL}},
1918         {&hf_sbas_l1_mt2_fc_6,     {"Fast Correction Satellite 6 (FC_6)",       "sbas_l1.mt2.fc_6",     FT_INT32,  BASE_CUSTOM, CF_FUNC(&fmt_correction_125m), 0x03ffc000, NULL, HFILL}},
1919         {&hf_sbas_l1_mt2_fc_7,     {"Fast Correction Satellite 7 (FC_7)",       "sbas_l1.mt2.fc_7",     FT_INT32,  BASE_CUSTOM, CF_FUNC(&fmt_correction_125m), 0x3ffc0000, NULL, HFILL}},
1920         {&hf_sbas_l1_mt2_fc_8,     {"Fast Correction Satellite 8 (FC_8)",       "sbas_l1.mt2.fc_8",     FT_INT32,  BASE_CUSTOM, CF_FUNC(&fmt_correction_125m), 0x03ffc000, NULL, HFILL}},
1921         {&hf_sbas_l1_mt2_fc_9,     {"Fast Correction Satellite 9 (FC_9)",       "sbas_l1.mt2.fc_9",     FT_INT32,  BASE_CUSTOM, CF_FUNC(&fmt_correction_125m), 0x3ffc0000, NULL, HFILL}},
1922         {&hf_sbas_l1_mt2_fc_10,    {"Fast Correction Satellite 10 (FC_10)",     "sbas_l1.mt2.fc_10",    FT_INT32,  BASE_CUSTOM, CF_FUNC(&fmt_correction_125m), 0x03ffc000, NULL, HFILL}},
1923         {&hf_sbas_l1_mt2_fc_11,    {"Fast Correction Satellite 11 (FC_11)",     "sbas_l1.mt2.fc_11",    FT_INT32,  BASE_CUSTOM, CF_FUNC(&fmt_correction_125m), 0x3ffc0000, NULL, HFILL}},
1924         {&hf_sbas_l1_mt2_fc_12,    {"Fast Correction Satellite 12 (FC_12)",     "sbas_l1.mt2.fc_12",    FT_INT32,  BASE_CUSTOM, CF_FUNC(&fmt_correction_125m), 0x03ffc000, NULL, HFILL}},
1925         {&hf_sbas_l1_mt2_fc_13,    {"Fast Correction Satellite 13 (FC_13)",     "sbas_l1.mt2.fc_13",    FT_INT32,  BASE_CUSTOM, CF_FUNC(&fmt_correction_125m), 0x3ffc0000, NULL, HFILL}},
1926         {&hf_sbas_l1_mt2_udrei_1,  {"UDREI_1",                                  "sbas_l1.mt2.udrei_1",  FT_UINT16, BASE_DEC,    VALS(UDREI_EVALUATION),        0x03c0,     NULL, HFILL}},
1927         {&hf_sbas_l1_mt2_udrei_2,  {"UDREI_2",                                  "sbas_l1.mt2.udrei_2",  FT_UINT16, BASE_DEC,    VALS(UDREI_EVALUATION),        0x3c00,     NULL, HFILL}},
1928         {&hf_sbas_l1_mt2_udrei_3,  {"UDREI_3",                                  "sbas_l1.mt2.udrei_3",  FT_UINT16, BASE_DEC,    VALS(UDREI_EVALUATION),        0x03c0,     NULL, HFILL}},
1929         {&hf_sbas_l1_mt2_udrei_4,  {"UDREI_4",                                  "sbas_l1.mt2.udrei_4",  FT_UINT16, BASE_DEC,    VALS(UDREI_EVALUATION),        0x3c00,     NULL, HFILL}},
1930         {&hf_sbas_l1_mt2_udrei_5,  {"UDREI_5",                                  "sbas_l1.mt2.udrei_5",  FT_UINT16, BASE_DEC,    VALS(UDREI_EVALUATION),        0x03c0,     NULL, HFILL}},
1931         {&hf_sbas_l1_mt2_udrei_6,  {"UDREI_6",                                  "sbas_l1.mt2.udrei_6",  FT_UINT16, BASE_DEC,    VALS(UDREI_EVALUATION),        0x3c00,     NULL, HFILL}},
1932         {&hf_sbas_l1_mt2_udrei_7,  {"UDREI_7",                                  "sbas_l1.mt2.udrei_7",  FT_UINT16, BASE_DEC,    VALS(UDREI_EVALUATION),        0x03c0,     NULL, HFILL}},
1933         {&hf_sbas_l1_mt2_udrei_8,  {"UDREI_8",                                  "sbas_l1.mt2.udrei_8",  FT_UINT16, BASE_DEC,    VALS(UDREI_EVALUATION),        0x3c00,     NULL, HFILL}},
1934         {&hf_sbas_l1_mt2_udrei_9,  {"UDREI_9",                                  "sbas_l1.mt2.udrei_9",  FT_UINT16, BASE_DEC,    VALS(UDREI_EVALUATION),        0x03c0,     NULL, HFILL}},
1935         {&hf_sbas_l1_mt2_udrei_10, {"UDREI_10",                                 "sbas_l1.mt2.udrei_10", FT_UINT16, BASE_DEC,    VALS(UDREI_EVALUATION),        0x3c00,     NULL, HFILL}},
1936         {&hf_sbas_l1_mt2_udrei_11, {"UDREI_11",                                 "sbas_l1.mt2.udrei_11", FT_UINT16, BASE_DEC,    VALS(UDREI_EVALUATION),        0x03c0,     NULL, HFILL}},
1937         {&hf_sbas_l1_mt2_udrei_12, {"UDREI_12",                                 "sbas_l1.mt2.udrei_12", FT_UINT16, BASE_DEC,    VALS(UDREI_EVALUATION),        0x3c00,     NULL, HFILL}},
1938         {&hf_sbas_l1_mt2_udrei_13, {"UDREI_13",                                 "sbas_l1.mt2.udrei_13", FT_UINT16, BASE_DEC,    VALS(UDREI_EVALUATION),        0x03c0,     NULL, HFILL}},
1939
1940         // MT3
1941         {&hf_sbas_l1_mt3,          {"MT3",                                      "sbas_l1.mt3",          FT_NONE,   BASE_NONE,   NULL,                          0x0,        NULL, HFILL}},
1942         {&hf_sbas_l1_mt3_iodf_3,   {"Issue of Data - Fast Correction (IODF_3)", "sbas_l1.mt3.iodf_3",   FT_UINT8,  BASE_DEC,    NULL,                          0x03,       NULL, HFILL}},
1943         {&hf_sbas_l1_mt3_iodp,     {"Issue of Data - PRN (IODP)",               "sbas_l1.mt3.iodp",     FT_UINT8,  BASE_DEC,    NULL,                          0xc0,       NULL, HFILL}},
1944         {&hf_sbas_l1_mt3_fc_14,    {"Fast Correction Satellite 14 (FC_14)",     "sbas_l1.mt3.fc_14",    FT_INT32,  BASE_CUSTOM, CF_FUNC(&fmt_correction_125m), 0x3ffc0000, NULL, HFILL}},
1945         {&hf_sbas_l1_mt3_fc_15,    {"Fast Correction Satellite 15 (FC_15)",     "sbas_l1.mt3.fc_15",    FT_INT32,  BASE_CUSTOM, CF_FUNC(&fmt_correction_125m), 0x03ffc000, NULL, HFILL}},
1946         {&hf_sbas_l1_mt3_fc_16,    {"Fast Correction Satellite 16 (FC_16)",     "sbas_l1.mt3.fc_16",    FT_INT32,  BASE_CUSTOM, CF_FUNC(&fmt_correction_125m), 0x3ffc0000, NULL, HFILL}},
1947         {&hf_sbas_l1_mt3_fc_17,    {"Fast Correction Satellite 17 (FC_17)",     "sbas_l1.mt3.fc_17",    FT_INT32,  BASE_CUSTOM, CF_FUNC(&fmt_correction_125m), 0x03ffc000, NULL, HFILL}},
1948         {&hf_sbas_l1_mt3_fc_18,    {"Fast Correction Satellite 18 (FC_18)",     "sbas_l1.mt3.fc_18",    FT_INT32,  BASE_CUSTOM, CF_FUNC(&fmt_correction_125m), 0x3ffc0000, NULL, HFILL}},
1949         {&hf_sbas_l1_mt3_fc_19,    {"Fast Correction Satellite 19 (FC_19)",     "sbas_l1.mt3.fc_19",    FT_INT32,  BASE_CUSTOM, CF_FUNC(&fmt_correction_125m), 0x03ffc000, NULL, HFILL}},
1950         {&hf_sbas_l1_mt3_fc_20,    {"Fast Correction Satellite 20 (FC_20)",     "sbas_l1.mt3.fc_20",    FT_INT32,  BASE_CUSTOM, CF_FUNC(&fmt_correction_125m), 0x3ffc0000, NULL, HFILL}},
1951         {&hf_sbas_l1_mt3_fc_21,    {"Fast Correction Satellite 21 (FC_21)",     "sbas_l1.mt3.fc_21",    FT_INT32,  BASE_CUSTOM, CF_FUNC(&fmt_correction_125m), 0x03ffc000, NULL, HFILL}},
1952         {&hf_sbas_l1_mt3_fc_22,    {"Fast Correction Satellite 22 (FC_22)",     "sbas_l1.mt3.fc_22",    FT_INT32,  BASE_CUSTOM, CF_FUNC(&fmt_correction_125m), 0x3ffc0000, NULL, HFILL}},
1953         {&hf_sbas_l1_mt3_fc_23,    {"Fast Correction Satellite 23 (FC_23)",     "sbas_l1.mt3.fc_23",    FT_INT32,  BASE_CUSTOM, CF_FUNC(&fmt_correction_125m), 0x03ffc000, NULL, HFILL}},
1954         {&hf_sbas_l1_mt3_fc_24,    {"Fast Correction Satellite 24 (FC_24)",     "sbas_l1.mt3.fc_24",    FT_INT32,  BASE_CUSTOM, CF_FUNC(&fmt_correction_125m), 0x3ffc0000, NULL, HFILL}},
1955         {&hf_sbas_l1_mt3_fc_25,    {"Fast Correction Satellite 25 (FC_25)",     "sbas_l1.mt3.fc_25",    FT_INT32,  BASE_CUSTOM, CF_FUNC(&fmt_correction_125m), 0x03ffc000, NULL, HFILL}},
1956         {&hf_sbas_l1_mt3_fc_26,    {"Fast Correction Satellite 26 (FC_26)",     "sbas_l1.mt3.fc_26",    FT_INT32,  BASE_CUSTOM, CF_FUNC(&fmt_correction_125m), 0x3ffc0000, NULL, HFILL}},
1957         {&hf_sbas_l1_mt3_udrei_14, {"UDREI_14",                                 "sbas_l1.mt3.udrei_14", FT_UINT16, BASE_DEC,    VALS(UDREI_EVALUATION),        0x03c0,     NULL, HFILL}},
1958         {&hf_sbas_l1_mt3_udrei_15, {"UDREI_15",                                 "sbas_l1.mt3.udrei_15", FT_UINT16, BASE_DEC,    VALS(UDREI_EVALUATION),        0x3c00,     NULL, HFILL}},
1959         {&hf_sbas_l1_mt3_udrei_16, {"UDREI_16",                                 "sbas_l1.mt3.udrei_16", FT_UINT16, BASE_DEC,    VALS(UDREI_EVALUATION),        0x03c0,     NULL, HFILL}},
1960         {&hf_sbas_l1_mt3_udrei_17, {"UDREI_17",                                 "sbas_l1.mt3.udrei_17", FT_UINT16, BASE_DEC,    VALS(UDREI_EVALUATION),        0x3c00,     NULL, HFILL}},
1961         {&hf_sbas_l1_mt3_udrei_18, {"UDREI_18",                                 "sbas_l1.mt3.udrei_18", FT_UINT16, BASE_DEC,    VALS(UDREI_EVALUATION),        0x03c0,     NULL, HFILL}},
1962         {&hf_sbas_l1_mt3_udrei_19, {"UDREI_19",                                 "sbas_l1.mt3.udrei_19", FT_UINT16, BASE_DEC,    VALS(UDREI_EVALUATION),        0x3c00,     NULL, HFILL}},
1963         {&hf_sbas_l1_mt3_udrei_20, {"UDREI_20",                                 "sbas_l1.mt3.udrei_20", FT_UINT16, BASE_DEC,    VALS(UDREI_EVALUATION),        0x03c0,     NULL, HFILL}},
1964         {&hf_sbas_l1_mt3_udrei_21, {"UDREI_21",                                 "sbas_l1.mt3.udrei_21", FT_UINT16, BASE_DEC,    VALS(UDREI_EVALUATION),        0x3c00,     NULL, HFILL}},
1965         {&hf_sbas_l1_mt3_udrei_22, {"UDREI_22",                                 "sbas_l1.mt3.udrei_22", FT_UINT16, BASE_DEC,    VALS(UDREI_EVALUATION),        0x03c0,     NULL, HFILL}},
1966         {&hf_sbas_l1_mt3_udrei_23, {"UDREI_23",                                 "sbas_l1.mt3.udrei_23", FT_UINT16, BASE_DEC,    VALS(UDREI_EVALUATION),        0x3c00,     NULL, HFILL}},
1967         {&hf_sbas_l1_mt3_udrei_24, {"UDREI_24",                                 "sbas_l1.mt3.udrei_24", FT_UINT16, BASE_DEC,    VALS(UDREI_EVALUATION),        0x03c0,     NULL, HFILL}},
1968         {&hf_sbas_l1_mt3_udrei_25, {"UDREI_25",                                 "sbas_l1.mt3.udrei_25", FT_UINT16, BASE_DEC,    VALS(UDREI_EVALUATION),        0x3c00,     NULL, HFILL}},
1969         {&hf_sbas_l1_mt3_udrei_26, {"UDREI_26",                                 "sbas_l1.mt3.udrei_26", FT_UINT16, BASE_DEC,    VALS(UDREI_EVALUATION),        0x03c0,     NULL, HFILL}},
1970
1971         // MT4
1972         {&hf_sbas_l1_mt4,          {"MT4",                                      "sbas_l1.mt4",          FT_NONE,   BASE_NONE,   NULL,                          0x0,        NULL, HFILL}},
1973         {&hf_sbas_l1_mt4_iodf_4,   {"Issue of Data - Fast Correction (IODF_4)", "sbas_l1.mt4.iodf_4",   FT_UINT8,  BASE_DEC,    NULL,                          0x03,       NULL, HFILL}},
1974         {&hf_sbas_l1_mt4_iodp,     {"Issue of Data - PRN (IODP)",               "sbas_l1.mt4.iodp",     FT_UINT8,  BASE_DEC,    NULL,                          0xc0,       NULL, HFILL}},
1975         {&hf_sbas_l1_mt4_fc_27,    {"Fast Correction Satellite 27 (FC_27)",     "sbas_l1.mt4.fc_27",    FT_INT32,  BASE_CUSTOM, CF_FUNC(&fmt_correction_125m), 0x3ffc0000, NULL, HFILL}},
1976         {&hf_sbas_l1_mt4_fc_28,    {"Fast Correction Satellite 28 (FC_28)",     "sbas_l1.mt4.fc_28",    FT_INT32,  BASE_CUSTOM, CF_FUNC(&fmt_correction_125m), 0x03ffc000, NULL, HFILL}},
1977         {&hf_sbas_l1_mt4_fc_29,    {"Fast Correction Satellite 29 (FC_29)",     "sbas_l1.mt4.fc_29",    FT_INT32,  BASE_CUSTOM, CF_FUNC(&fmt_correction_125m), 0x3ffc0000, NULL, HFILL}},
1978         {&hf_sbas_l1_mt4_fc_30,    {"Fast Correction Satellite 30 (FC_30)",     "sbas_l1.mt4.fc_30",    FT_INT32,  BASE_CUSTOM, CF_FUNC(&fmt_correction_125m), 0x03ffc000, NULL, HFILL}},
1979         {&hf_sbas_l1_mt4_fc_31,    {"Fast Correction Satellite 31 (FC_31)",     "sbas_l1.mt4.fc_31",    FT_INT32,  BASE_CUSTOM, CF_FUNC(&fmt_correction_125m), 0x3ffc0000, NULL, HFILL}},
1980         {&hf_sbas_l1_mt4_fc_32,    {"Fast Correction Satellite 32 (FC_32)",     "sbas_l1.mt4.fc_32",    FT_INT32,  BASE_CUSTOM, CF_FUNC(&fmt_correction_125m), 0x03ffc000, NULL, HFILL}},
1981         {&hf_sbas_l1_mt4_fc_33,    {"Fast Correction Satellite 33 (FC_33)",     "sbas_l1.mt4.fc_33",    FT_INT32,  BASE_CUSTOM, CF_FUNC(&fmt_correction_125m), 0x3ffc0000, NULL, HFILL}},
1982         {&hf_sbas_l1_mt4_fc_34,    {"Fast Correction Satellite 34 (FC_34)",     "sbas_l1.mt4.fc_34",    FT_INT32,  BASE_CUSTOM, CF_FUNC(&fmt_correction_125m), 0x03ffc000, NULL, HFILL}},
1983         {&hf_sbas_l1_mt4_fc_35,    {"Fast Correction Satellite 35 (FC_35)",     "sbas_l1.mt4.fc_35",    FT_INT32,  BASE_CUSTOM, CF_FUNC(&fmt_correction_125m), 0x3ffc0000, NULL, HFILL}},
1984         {&hf_sbas_l1_mt4_fc_36,    {"Fast Correction Satellite 36 (FC_36)",     "sbas_l1.mt4.fc_36",    FT_INT32,  BASE_CUSTOM, CF_FUNC(&fmt_correction_125m), 0x03ffc000, NULL, HFILL}},
1985         {&hf_sbas_l1_mt4_fc_37,    {"Fast Correction Satellite 37 (FC_37)",     "sbas_l1.mt4.fc_37",    FT_INT32,  BASE_CUSTOM, CF_FUNC(&fmt_correction_125m), 0x3ffc0000, NULL, HFILL}},
1986         {&hf_sbas_l1_mt4_fc_38,    {"Fast Correction Satellite 38 (FC_38)",     "sbas_l1.mt4.fc_38",    FT_INT32,  BASE_CUSTOM, CF_FUNC(&fmt_correction_125m), 0x03ffc000, NULL, HFILL}},
1987         {&hf_sbas_l1_mt4_fc_39,    {"Fast Correction Satellite 39 (FC_39)",     "sbas_l1.mt4.fc_39",    FT_INT32,  BASE_CUSTOM, CF_FUNC(&fmt_correction_125m), 0x3ffc0000, NULL, HFILL}},
1988         {&hf_sbas_l1_mt4_udrei_27, {"UDREI_27",                                 "sbas_l1.mt4.udrei_27", FT_UINT16, BASE_DEC,    VALS(UDREI_EVALUATION),        0x03c0,     NULL, HFILL}},
1989         {&hf_sbas_l1_mt4_udrei_28, {"UDREI_28",                                 "sbas_l1.mt4.udrei_28", FT_UINT16, BASE_DEC,    VALS(UDREI_EVALUATION),        0x3c00,     NULL, HFILL}},
1990         {&hf_sbas_l1_mt4_udrei_29, {"UDREI_29",                                 "sbas_l1.mt4.udrei_29", FT_UINT16, BASE_DEC,    VALS(UDREI_EVALUATION),        0x03c0,     NULL, HFILL}},
1991         {&hf_sbas_l1_mt4_udrei_30, {"UDREI_30",                                 "sbas_l1.mt4.udrei_30", FT_UINT16, BASE_DEC,    VALS(UDREI_EVALUATION),        0x3c00,     NULL, HFILL}},
1992         {&hf_sbas_l1_mt4_udrei_31, {"UDREI_31",                                 "sbas_l1.mt4.udrei_31", FT_UINT16, BASE_DEC,    VALS(UDREI_EVALUATION),        0x03c0,     NULL, HFILL}},
1993         {&hf_sbas_l1_mt4_udrei_32, {"UDREI_32",                                 "sbas_l1.mt4.udrei_32", FT_UINT16, BASE_DEC,    VALS(UDREI_EVALUATION),        0x3c00,     NULL, HFILL}},
1994         {&hf_sbas_l1_mt4_udrei_33, {"UDREI_33",                                 "sbas_l1.mt4.udrei_33", FT_UINT16, BASE_DEC,    VALS(UDREI_EVALUATION),        0x03c0,     NULL, HFILL}},
1995         {&hf_sbas_l1_mt4_udrei_34, {"UDREI_34",                                 "sbas_l1.mt4.udrei_34", FT_UINT16, BASE_DEC,    VALS(UDREI_EVALUATION),        0x3c00,     NULL, HFILL}},
1996         {&hf_sbas_l1_mt4_udrei_35, {"UDREI_35",                                 "sbas_l1.mt4.udrei_35", FT_UINT16, BASE_DEC,    VALS(UDREI_EVALUATION),        0x03c0,     NULL, HFILL}},
1997         {&hf_sbas_l1_mt4_udrei_36, {"UDREI_36",                                 "sbas_l1.mt4.udrei_36", FT_UINT16, BASE_DEC,    VALS(UDREI_EVALUATION),        0x3c00,     NULL, HFILL}},
1998         {&hf_sbas_l1_mt4_udrei_37, {"UDREI_37",                                 "sbas_l1.mt4.udrei_37", FT_UINT16, BASE_DEC,    VALS(UDREI_EVALUATION),        0x03c0,     NULL, HFILL}},
1999         {&hf_sbas_l1_mt4_udrei_38, {"UDREI_38",                                 "sbas_l1.mt4.udrei_38", FT_UINT16, BASE_DEC,    VALS(UDREI_EVALUATION),        0x3c00,     NULL, HFILL}},
2000         {&hf_sbas_l1_mt4_udrei_39, {"UDREI_39",                                 "sbas_l1.mt4.udrei_39", FT_UINT16, BASE_DEC,    VALS(UDREI_EVALUATION),        0x03c0,     NULL, HFILL}},
2001
2002         // MT5
2003         {&hf_sbas_l1_mt5,          {"MT5",                                      "sbas_l1.mt5",          FT_NONE,   BASE_NONE,   NULL,                          0x0,        NULL, HFILL}},
2004         {&hf_sbas_l1_mt5_iodf_5,   {"Issue of Data - Fast Correction (IODF_5)", "sbas_l1.mt5.iodf_5",   FT_UINT8,  BASE_DEC,    NULL,                          0x03,       NULL, HFILL}},
2005         {&hf_sbas_l1_mt5_iodp,     {"Issue of Data - PRN (IODP)",               "sbas_l1.mt5.iodp",     FT_UINT8,  BASE_DEC,    NULL,                          0xc0,       NULL, HFILL}},
2006         {&hf_sbas_l1_mt5_fc_40,    {"Fast Correction Satellite 40 (FC_40)",     "sbas_l1.mt5.fc_40",    FT_INT32,  BASE_CUSTOM, CF_FUNC(&fmt_correction_125m), 0x3ffc0000, NULL, HFILL}},
2007         {&hf_sbas_l1_mt5_fc_41,    {"Fast Correction Satellite 41 (FC_41)",     "sbas_l1.mt5.fc_41",    FT_INT32,  BASE_CUSTOM, CF_FUNC(&fmt_correction_125m), 0x03ffc000, NULL, HFILL}},
2008         {&hf_sbas_l1_mt5_fc_42,    {"Fast Correction Satellite 42 (FC_42)",     "sbas_l1.mt5.fc_42",    FT_INT32,  BASE_CUSTOM, CF_FUNC(&fmt_correction_125m), 0x3ffc0000, NULL, HFILL}},
2009         {&hf_sbas_l1_mt5_fc_43,    {"Fast Correction Satellite 43 (FC_43)",     "sbas_l1.mt5.fc_43",    FT_INT32,  BASE_CUSTOM, CF_FUNC(&fmt_correction_125m), 0x03ffc000, NULL, HFILL}},
2010         {&hf_sbas_l1_mt5_fc_44,    {"Fast Correction Satellite 44 (FC_44)",     "sbas_l1.mt5.fc_44",    FT_INT32,  BASE_CUSTOM, CF_FUNC(&fmt_correction_125m), 0x3ffc0000, NULL, HFILL}},
2011         {&hf_sbas_l1_mt5_fc_45,    {"Fast Correction Satellite 45 (FC_45)",     "sbas_l1.mt5.fc_45",    FT_INT32,  BASE_CUSTOM, CF_FUNC(&fmt_correction_125m), 0x03ffc000, NULL, HFILL}},
2012         {&hf_sbas_l1_mt5_fc_46,    {"Fast Correction Satellite 46 (FC_46)",     "sbas_l1.mt5.fc_46",    FT_INT32,  BASE_CUSTOM, CF_FUNC(&fmt_correction_125m), 0x3ffc0000, NULL, HFILL}},
2013         {&hf_sbas_l1_mt5_fc_47,    {"Fast Correction Satellite 47 (FC_47)",     "sbas_l1.mt5.fc_47",    FT_INT32,  BASE_CUSTOM, CF_FUNC(&fmt_correction_125m), 0x03ffc000, NULL, HFILL}},
2014         {&hf_sbas_l1_mt5_fc_48,    {"Fast Correction Satellite 48 (FC_48)",     "sbas_l1.mt5.fc_48",    FT_INT32,  BASE_CUSTOM, CF_FUNC(&fmt_correction_125m), 0x3ffc0000, NULL, HFILL}},
2015         {&hf_sbas_l1_mt5_fc_49,    {"Fast Correction Satellite 49 (FC_49)",     "sbas_l1.mt5.fc_49",    FT_INT32,  BASE_CUSTOM, CF_FUNC(&fmt_correction_125m), 0x03ffc000, NULL, HFILL}},
2016         {&hf_sbas_l1_mt5_fc_50,    {"Fast Correction Satellite 50 (FC_50)",     "sbas_l1.mt5.fc_50",    FT_INT32,  BASE_CUSTOM, CF_FUNC(&fmt_correction_125m), 0x3ffc0000, NULL, HFILL}},
2017         {&hf_sbas_l1_mt5_fc_51,    {"Fast Correction Satellite 51 (FC_51)",     "sbas_l1.mt5.fc_51",    FT_INT32,  BASE_CUSTOM, CF_FUNC(&fmt_correction_125m), 0x03ffc000, NULL, HFILL}},
2018         {&hf_sbas_l1_mt5_fc_52,    {"Fast Correction Satellite 52 (FC_52)",     "sbas_l1.mt5.fc_52",    FT_INT32,  BASE_CUSTOM, CF_FUNC(&fmt_correction_125m), 0x3ffc0000, NULL, HFILL}},
2019         {&hf_sbas_l1_mt5_udrei_40, {"UDREI_40",                                 "sbas_l1.mt5.udrei_40", FT_UINT16, BASE_DEC,    VALS(UDREI_EVALUATION),        0x03c0,     NULL, HFILL}},
2020         {&hf_sbas_l1_mt5_udrei_41, {"UDREI_41",                                 "sbas_l1.mt5.udrei_41", FT_UINT16, BASE_DEC,    VALS(UDREI_EVALUATION),        0x3c00,     NULL, HFILL}},
2021         {&hf_sbas_l1_mt5_udrei_42, {"UDREI_42",                                 "sbas_l1.mt5.udrei_42", FT_UINT16, BASE_DEC,    VALS(UDREI_EVALUATION),        0x03c0,     NULL, HFILL}},
2022         {&hf_sbas_l1_mt5_udrei_43, {"UDREI_43",                                 "sbas_l1.mt5.udrei_43", FT_UINT16, BASE_DEC,    VALS(UDREI_EVALUATION),        0x3c00,     NULL, HFILL}},
2023         {&hf_sbas_l1_mt5_udrei_44, {"UDREI_44",                                 "sbas_l1.mt5.udrei_44", FT_UINT16, BASE_DEC,    VALS(UDREI_EVALUATION),        0x03c0,     NULL, HFILL}},
2024         {&hf_sbas_l1_mt5_udrei_45, {"UDREI_45",                                 "sbas_l1.mt5.udrei_45", FT_UINT16, BASE_DEC,    VALS(UDREI_EVALUATION),        0x3c00,     NULL, HFILL}},
2025         {&hf_sbas_l1_mt5_udrei_46, {"UDREI_46",                                 "sbas_l1.mt5.udrei_46", FT_UINT16, BASE_DEC,    VALS(UDREI_EVALUATION),        0x03c0,     NULL, HFILL}},
2026         {&hf_sbas_l1_mt5_udrei_47, {"UDREI_47",                                 "sbas_l1.mt5.udrei_47", FT_UINT16, BASE_DEC,    VALS(UDREI_EVALUATION),        0x3c00,     NULL, HFILL}},
2027         {&hf_sbas_l1_mt5_udrei_48, {"UDREI_48",                                 "sbas_l1.mt5.udrei_48", FT_UINT16, BASE_DEC,    VALS(UDREI_EVALUATION),        0x03c0,     NULL, HFILL}},
2028         {&hf_sbas_l1_mt5_udrei_49, {"UDREI_49",                                 "sbas_l1.mt5.udrei_49", FT_UINT16, BASE_DEC,    VALS(UDREI_EVALUATION),        0x3c00,     NULL, HFILL}},
2029         {&hf_sbas_l1_mt5_udrei_50, {"UDREI_50",                                 "sbas_l1.mt5.udrei_50", FT_UINT16, BASE_DEC,    VALS(UDREI_EVALUATION),        0x03c0,     NULL, HFILL}},
2030         {&hf_sbas_l1_mt5_udrei_51, {"UDREI_51",                                 "sbas_l1.mt5.udrei_51", FT_UINT16, BASE_DEC,    VALS(UDREI_EVALUATION),        0x3c00,     NULL, HFILL}},
2031         {&hf_sbas_l1_mt5_udrei_52, {"UDREI_52",                                 "sbas_l1.mt5.udrei_52", FT_UINT16, BASE_DEC,    VALS(UDREI_EVALUATION),        0x03c0,     NULL, HFILL}},
2032
2033         // MT6
2034         {&hf_sbas_l1_mt6,          {"MT6",                                      "sbas_l1.mt6",          FT_NONE,   BASE_NONE, NULL,                   0x0,    NULL, HFILL}},
2035         {&hf_sbas_l1_mt6_iodf_2,   {"Issue of Data - Fast Correction (IODF_2)", "sbas_l1.mt6.iodf_2",   FT_UINT8,  BASE_DEC,  NULL,                   0x03,   NULL, HFILL}},
2036         {&hf_sbas_l1_mt6_iodf_3,   {"Issue of Data - Fast Correction (IODF_3)", "sbas_l1.mt6.iodf_3",   FT_UINT8,  BASE_DEC,  NULL,                   0xc0,   NULL, HFILL}},
2037         {&hf_sbas_l1_mt6_iodf_4,   {"Issue of Data - Fast Correction (IODF_4)", "sbas_l1.mt6.iodf_4",   FT_UINT8,  BASE_DEC,  NULL,                   0x30,   NULL, HFILL}},
2038         {&hf_sbas_l1_mt6_iodf_5,   {"Issue of Data - Fast Correction (IODF_5)", "sbas_l1.mt6.iodf_5",   FT_UINT8,  BASE_DEC,  NULL,                   0x0c,   NULL, HFILL}},
2039         {&hf_sbas_l1_mt6_udrei_1,  {"UDREI_1",                                  "sbas_l1.mt6.udrei_1",  FT_UINT16, BASE_DEC,  VALS(UDREI_EVALUATION), 0x03c0, NULL, HFILL}},
2040         {&hf_sbas_l1_mt6_udrei_2,  {"UDREI_2",                                  "sbas_l1.mt6.udrei_2",  FT_UINT16, BASE_DEC,  VALS(UDREI_EVALUATION), 0x3c00, NULL, HFILL}},
2041         {&hf_sbas_l1_mt6_udrei_3,  {"UDREI_3",                                  "sbas_l1.mt6.udrei_3",  FT_UINT16, BASE_DEC,  VALS(UDREI_EVALUATION), 0x03c0, NULL, HFILL}},
2042         {&hf_sbas_l1_mt6_udrei_4,  {"UDREI_4",                                  "sbas_l1.mt6.udrei_4",  FT_UINT16, BASE_DEC,  VALS(UDREI_EVALUATION), 0x3c00, NULL, HFILL}},
2043         {&hf_sbas_l1_mt6_udrei_5,  {"UDREI_5",                                  "sbas_l1.mt6.udrei_5",  FT_UINT16, BASE_DEC,  VALS(UDREI_EVALUATION), 0x03c0, NULL, HFILL}},
2044         {&hf_sbas_l1_mt6_udrei_6,  {"UDREI_6",                                  "sbas_l1.mt6.udrei_6",  FT_UINT16, BASE_DEC,  VALS(UDREI_EVALUATION), 0x3c00, NULL, HFILL}},
2045         {&hf_sbas_l1_mt6_udrei_7,  {"UDREI_7",                                  "sbas_l1.mt6.udrei_7",  FT_UINT16, BASE_DEC,  VALS(UDREI_EVALUATION), 0x03c0, NULL, HFILL}},
2046         {&hf_sbas_l1_mt6_udrei_8,  {"UDREI_8",                                  "sbas_l1.mt6.udrei_8",  FT_UINT16, BASE_DEC,  VALS(UDREI_EVALUATION), 0x3c00, NULL, HFILL}},
2047         {&hf_sbas_l1_mt6_udrei_9,  {"UDREI_9",                                  "sbas_l1.mt6.udrei_9",  FT_UINT16, BASE_DEC,  VALS(UDREI_EVALUATION), 0x03c0, NULL, HFILL}},
2048         {&hf_sbas_l1_mt6_udrei_10, {"UDREI_10",                                 "sbas_l1.mt6.udrei_10", FT_UINT16, BASE_DEC,  VALS(UDREI_EVALUATION), 0x3c00, NULL, HFILL}},
2049         {&hf_sbas_l1_mt6_udrei_11, {"UDREI_11",                                 "sbas_l1.mt6.udrei_11", FT_UINT16, BASE_DEC,  VALS(UDREI_EVALUATION), 0x03c0, NULL, HFILL}},
2050         {&hf_sbas_l1_mt6_udrei_12, {"UDREI_12",                                 "sbas_l1.mt6.udrei_12", FT_UINT16, BASE_DEC,  VALS(UDREI_EVALUATION), 0x3c00, NULL, HFILL}},
2051         {&hf_sbas_l1_mt6_udrei_13, {"UDREI_13",                                 "sbas_l1.mt6.udrei_13", FT_UINT16, BASE_DEC,  VALS(UDREI_EVALUATION), 0x03c0, NULL, HFILL}},
2052         {&hf_sbas_l1_mt6_udrei_14, {"UDREI_14",                                 "sbas_l1.mt6.udrei_14", FT_UINT16, BASE_DEC,  VALS(UDREI_EVALUATION), 0x3c00, NULL, HFILL}},
2053         {&hf_sbas_l1_mt6_udrei_15, {"UDREI_15",                                 "sbas_l1.mt6.udrei_15", FT_UINT16, BASE_DEC,  VALS(UDREI_EVALUATION), 0x03c0, NULL, HFILL}},
2054         {&hf_sbas_l1_mt6_udrei_16, {"UDREI_16",                                 "sbas_l1.mt6.udrei_16", FT_UINT16, BASE_DEC,  VALS(UDREI_EVALUATION), 0x3c00, NULL, HFILL}},
2055         {&hf_sbas_l1_mt6_udrei_17, {"UDREI_17",                                 "sbas_l1.mt6.udrei_17", FT_UINT16, BASE_DEC,  VALS(UDREI_EVALUATION), 0x03c0, NULL, HFILL}},
2056         {&hf_sbas_l1_mt6_udrei_18, {"UDREI_18",                                 "sbas_l1.mt6.udrei_18", FT_UINT16, BASE_DEC,  VALS(UDREI_EVALUATION), 0x3c00, NULL, HFILL}},
2057         {&hf_sbas_l1_mt6_udrei_19, {"UDREI_19",                                 "sbas_l1.mt6.udrei_19", FT_UINT16, BASE_DEC,  VALS(UDREI_EVALUATION), 0x03c0, NULL, HFILL}},
2058         {&hf_sbas_l1_mt6_udrei_20, {"UDREI_20",                                 "sbas_l1.mt6.udrei_20", FT_UINT16, BASE_DEC,  VALS(UDREI_EVALUATION), 0x3c00, NULL, HFILL}},
2059         {&hf_sbas_l1_mt6_udrei_21, {"UDREI_21",                                 "sbas_l1.mt6.udrei_21", FT_UINT16, BASE_DEC,  VALS(UDREI_EVALUATION), 0x03c0, NULL, HFILL}},
2060         {&hf_sbas_l1_mt6_udrei_22, {"UDREI_22",                                 "sbas_l1.mt6.udrei_22", FT_UINT16, BASE_DEC,  VALS(UDREI_EVALUATION), 0x3c00, NULL, HFILL}},
2061         {&hf_sbas_l1_mt6_udrei_23, {"UDREI_23",                                 "sbas_l1.mt6.udrei_23", FT_UINT16, BASE_DEC,  VALS(UDREI_EVALUATION), 0x03c0, NULL, HFILL}},
2062         {&hf_sbas_l1_mt6_udrei_24, {"UDREI_24",                                 "sbas_l1.mt6.udrei_24", FT_UINT16, BASE_DEC,  VALS(UDREI_EVALUATION), 0x3c00, NULL, HFILL}},
2063         {&hf_sbas_l1_mt6_udrei_25, {"UDREI_25",                                 "sbas_l1.mt6.udrei_25", FT_UINT16, BASE_DEC,  VALS(UDREI_EVALUATION), 0x03c0, NULL, HFILL}},
2064         {&hf_sbas_l1_mt6_udrei_26, {"UDREI_26",                                 "sbas_l1.mt6.udrei_26", FT_UINT16, BASE_DEC,  VALS(UDREI_EVALUATION), 0x3c00, NULL, HFILL}},
2065         {&hf_sbas_l1_mt6_udrei_27, {"UDREI_27",                                 "sbas_l1.mt6.udrei_27", FT_UINT16, BASE_DEC,  VALS(UDREI_EVALUATION), 0x03c0, NULL, HFILL}},
2066         {&hf_sbas_l1_mt6_udrei_28, {"UDREI_28",                                 "sbas_l1.mt6.udrei_28", FT_UINT16, BASE_DEC,  VALS(UDREI_EVALUATION), 0x3c00, NULL, HFILL}},
2067         {&hf_sbas_l1_mt6_udrei_29, {"UDREI_29",                                 "sbas_l1.mt6.udrei_29", FT_UINT16, BASE_DEC,  VALS(UDREI_EVALUATION), 0x03c0, NULL, HFILL}},
2068         {&hf_sbas_l1_mt6_udrei_30, {"UDREI_30",                                 "sbas_l1.mt6.udrei_30", FT_UINT16, BASE_DEC,  VALS(UDREI_EVALUATION), 0x3c00, NULL, HFILL}},
2069         {&hf_sbas_l1_mt6_udrei_31, {"UDREI_31",                                 "sbas_l1.mt6.udrei_31", FT_UINT16, BASE_DEC,  VALS(UDREI_EVALUATION), 0x03c0, NULL, HFILL}},
2070         {&hf_sbas_l1_mt6_udrei_32, {"UDREI_32",                                 "sbas_l1.mt6.udrei_32", FT_UINT16, BASE_DEC,  VALS(UDREI_EVALUATION), 0x3c00, NULL, HFILL}},
2071         {&hf_sbas_l1_mt6_udrei_33, {"UDREI_33",                                 "sbas_l1.mt6.udrei_33", FT_UINT16, BASE_DEC,  VALS(UDREI_EVALUATION), 0x03c0, NULL, HFILL}},
2072         {&hf_sbas_l1_mt6_udrei_34, {"UDREI_34",                                 "sbas_l1.mt6.udrei_34", FT_UINT16, BASE_DEC,  VALS(UDREI_EVALUATION), 0x3c00, NULL, HFILL}},
2073         {&hf_sbas_l1_mt6_udrei_35, {"UDREI_35",                                 "sbas_l1.mt6.udrei_35", FT_UINT16, BASE_DEC,  VALS(UDREI_EVALUATION), 0x03c0, NULL, HFILL}},
2074         {&hf_sbas_l1_mt6_udrei_36, {"UDREI_36",                                 "sbas_l1.mt6.udrei_36", FT_UINT16, BASE_DEC,  VALS(UDREI_EVALUATION), 0x3c00, NULL, HFILL}},
2075         {&hf_sbas_l1_mt6_udrei_37, {"UDREI_37",                                 "sbas_l1.mt6.udrei_37", FT_UINT16, BASE_DEC,  VALS(UDREI_EVALUATION), 0x03c0, NULL, HFILL}},
2076         {&hf_sbas_l1_mt6_udrei_38, {"UDREI_38",                                 "sbas_l1.mt6.udrei_38", FT_UINT16, BASE_DEC,  VALS(UDREI_EVALUATION), 0x3c00, NULL, HFILL}},
2077         {&hf_sbas_l1_mt6_udrei_39, {"UDREI_39",                                 "sbas_l1.mt6.udrei_39", FT_UINT16, BASE_DEC,  VALS(UDREI_EVALUATION), 0x03c0, NULL, HFILL}},
2078         {&hf_sbas_l1_mt6_udrei_40, {"UDREI_40",                                 "sbas_l1.mt6.udrei_40", FT_UINT16, BASE_DEC,  VALS(UDREI_EVALUATION), 0x3c00, NULL, HFILL}},
2079         {&hf_sbas_l1_mt6_udrei_41, {"UDREI_41",                                 "sbas_l1.mt6.udrei_41", FT_UINT16, BASE_DEC,  VALS(UDREI_EVALUATION), 0x03c0, NULL, HFILL}},
2080         {&hf_sbas_l1_mt6_udrei_42, {"UDREI_42",                                 "sbas_l1.mt6.udrei_42", FT_UINT16, BASE_DEC,  VALS(UDREI_EVALUATION), 0x3c00, NULL, HFILL}},
2081         {&hf_sbas_l1_mt6_udrei_43, {"UDREI_43",                                 "sbas_l1.mt6.udrei_43", FT_UINT16, BASE_DEC,  VALS(UDREI_EVALUATION), 0x03c0, NULL, HFILL}},
2082         {&hf_sbas_l1_mt6_udrei_44, {"UDREI_44",                                 "sbas_l1.mt6.udrei_44", FT_UINT16, BASE_DEC,  VALS(UDREI_EVALUATION), 0x3c00, NULL, HFILL}},
2083         {&hf_sbas_l1_mt6_udrei_45, {"UDREI_45",                                 "sbas_l1.mt6.udrei_45", FT_UINT16, BASE_DEC,  VALS(UDREI_EVALUATION), 0x03c0, NULL, HFILL}},
2084         {&hf_sbas_l1_mt6_udrei_46, {"UDREI_46",                                 "sbas_l1.mt6.udrei_46", FT_UINT16, BASE_DEC,  VALS(UDREI_EVALUATION), 0x3c00, NULL, HFILL}},
2085         {&hf_sbas_l1_mt6_udrei_47, {"UDREI_47",                                 "sbas_l1.mt6.udrei_47", FT_UINT16, BASE_DEC,  VALS(UDREI_EVALUATION), 0x03c0, NULL, HFILL}},
2086         {&hf_sbas_l1_mt6_udrei_48, {"UDREI_48",                                 "sbas_l1.mt6.udrei_48", FT_UINT16, BASE_DEC,  VALS(UDREI_EVALUATION), 0x3c00, NULL, HFILL}},
2087         {&hf_sbas_l1_mt6_udrei_49, {"UDREI_49",                                 "sbas_l1.mt6.udrei_49", FT_UINT16, BASE_DEC,  VALS(UDREI_EVALUATION), 0x03c0, NULL, HFILL}},
2088         {&hf_sbas_l1_mt6_udrei_50, {"UDREI_50",                                 "sbas_l1.mt6.udrei_50", FT_UINT16, BASE_DEC,  VALS(UDREI_EVALUATION), 0x3c00, NULL, HFILL}},
2089         {&hf_sbas_l1_mt6_udrei_51, {"UDREI_51",                                 "sbas_l1.mt6.udrei_51", FT_UINT16, BASE_DEC,  VALS(UDREI_EVALUATION), 0x03c0, NULL, HFILL}},
2090
2091         // MT7
2092         {&hf_sbas_l1_mt7,          {"MT7",                                "sbas_l1.mt7",          FT_NONE,   BASE_NONE, NULL,                               0x0,    NULL, HFILL}},
2093         {&hf_sbas_l1_mt7_t_lat,    {"System Latency (t_lat)",             "sbas_l1.mt7.t_lat",    FT_UINT16, BASE_DEC|BASE_UNIT_STRING, UNS(&units_seconds),     0x03c0, NULL, HFILL}},
2094         {&hf_sbas_l1_mt7_iodp,     {"Issue of Data - PRN (IODP)",         "sbas_l1.mt7.iodp",     FT_UINT8,  BASE_DEC,  NULL,                               0x30,   NULL, HFILL}},
2095         {&hf_sbas_l1_mt7_spare,    {"Spare",                              "sbas_l1.mt7.spare",    FT_UINT8,  BASE_DEC,  NULL,                               0x0c,   NULL, HFILL}},
2096         {&hf_sbas_l1_mt7_ai_1,     {"Degradation Factor Indicator ai_1",  "sbas_l1.mt7.ai_1",     FT_UINT16, BASE_DEC,  VALS(DEGRADATION_FACTOR_INDICATOR), 0x03c0, NULL, HFILL}},
2097         {&hf_sbas_l1_mt7_ai_2,     {"Degradation Factor Indicator ai_2",  "sbas_l1.mt7.ai_2",     FT_UINT16, BASE_DEC,  VALS(DEGRADATION_FACTOR_INDICATOR), 0x3c00, NULL, HFILL}},
2098         {&hf_sbas_l1_mt7_ai_3,     {"Degradation Factor Indicator ai_3",  "sbas_l1.mt7.ai_3",     FT_UINT16, BASE_DEC,  VALS(DEGRADATION_FACTOR_INDICATOR), 0x03c0, NULL, HFILL}},
2099         {&hf_sbas_l1_mt7_ai_4,     {"Degradation Factor Indicator ai_4",  "sbas_l1.mt7.ai_4",     FT_UINT16, BASE_DEC,  VALS(DEGRADATION_FACTOR_INDICATOR), 0x3c00, NULL, HFILL}},
2100         {&hf_sbas_l1_mt7_ai_5,     {"Degradation Factor Indicator ai_5",  "sbas_l1.mt7.ai_5",     FT_UINT16, BASE_DEC,  VALS(DEGRADATION_FACTOR_INDICATOR), 0x03c0, NULL, HFILL}},
2101         {&hf_sbas_l1_mt7_ai_6,     {"Degradation Factor Indicator ai_6",  "sbas_l1.mt7.ai_6",     FT_UINT16, BASE_DEC,  VALS(DEGRADATION_FACTOR_INDICATOR), 0x3c00, NULL, HFILL}},
2102         {&hf_sbas_l1_mt7_ai_7,     {"Degradation Factor Indicator ai_7",  "sbas_l1.mt7.ai_7",     FT_UINT16, BASE_DEC,  VALS(DEGRADATION_FACTOR_INDICATOR), 0x03c0, NULL, HFILL}},
2103         {&hf_sbas_l1_mt7_ai_8,     {"Degradation Factor Indicator ai_8",  "sbas_l1.mt7.ai_8",     FT_UINT16, BASE_DEC,  VALS(DEGRADATION_FACTOR_INDICATOR), 0x3c00, NULL, HFILL}},
2104         {&hf_sbas_l1_mt7_ai_9,     {"Degradation Factor Indicator ai_9",  "sbas_l1.mt7.ai_9",     FT_UINT16, BASE_DEC,  VALS(DEGRADATION_FACTOR_INDICATOR), 0x03c0, NULL, HFILL}},
2105         {&hf_sbas_l1_mt7_ai_10,    {"Degradation Factor Indicator ai_10", "sbas_l1.mt7.ai_10",    FT_UINT16, BASE_DEC,  VALS(DEGRADATION_FACTOR_INDICATOR), 0x3c00, NULL, HFILL}},
2106         {&hf_sbas_l1_mt7_ai_11,    {"Degradation Factor Indicator ai_11", "sbas_l1.mt7.ai_11",    FT_UINT16, BASE_DEC,  VALS(DEGRADATION_FACTOR_INDICATOR), 0x03c0, NULL, HFILL}},
2107         {&hf_sbas_l1_mt7_ai_12,    {"Degradation Factor Indicator ai_12", "sbas_l1.mt7.ai_12",    FT_UINT16, BASE_DEC,  VALS(DEGRADATION_FACTOR_INDICATOR), 0x3c00, NULL, HFILL}},
2108         {&hf_sbas_l1_mt7_ai_13,    {"Degradation Factor Indicator ai_13", "sbas_l1.mt7.ai_13",    FT_UINT16, BASE_DEC,  VALS(DEGRADATION_FACTOR_INDICATOR), 0x03c0, NULL, HFILL}},
2109         {&hf_sbas_l1_mt7_ai_14,    {"Degradation Factor Indicator ai_14", "sbas_l1.mt7.ai_14",    FT_UINT16, BASE_DEC,  VALS(DEGRADATION_FACTOR_INDICATOR), 0x3c00, NULL, HFILL}},
2110         {&hf_sbas_l1_mt7_ai_15,    {"Degradation Factor Indicator ai_15", "sbas_l1.mt7.ai_15",    FT_UINT16, BASE_DEC,  VALS(DEGRADATION_FACTOR_INDICATOR), 0x03c0, NULL, HFILL}},
2111         {&hf_sbas_l1_mt7_ai_16,    {"Degradation Factor Indicator ai_16", "sbas_l1.mt7.ai_16",    FT_UINT16, BASE_DEC,  VALS(DEGRADATION_FACTOR_INDICATOR), 0x3c00, NULL, HFILL}},
2112         {&hf_sbas_l1_mt7_ai_17,    {"Degradation Factor Indicator ai_17", "sbas_l1.mt7.ai_17",    FT_UINT16, BASE_DEC,  VALS(DEGRADATION_FACTOR_INDICATOR), 0x03c0, NULL, HFILL}},
2113         {&hf_sbas_l1_mt7_ai_18,    {"Degradation Factor Indicator ai_18", "sbas_l1.mt7.ai_18",    FT_UINT16, BASE_DEC,  VALS(DEGRADATION_FACTOR_INDICATOR), 0x3c00, NULL, HFILL}},
2114         {&hf_sbas_l1_mt7_ai_19,    {"Degradation Factor Indicator ai_19", "sbas_l1.mt7.ai_19",    FT_UINT16, BASE_DEC,  VALS(DEGRADATION_FACTOR_INDICATOR), 0x03c0, NULL, HFILL}},
2115         {&hf_sbas_l1_mt7_ai_20,    {"Degradation Factor Indicator ai_20", "sbas_l1.mt7.ai_20",    FT_UINT16, BASE_DEC,  VALS(DEGRADATION_FACTOR_INDICATOR), 0x3c00, NULL, HFILL}},
2116         {&hf_sbas_l1_mt7_ai_21,    {"Degradation Factor Indicator ai_21", "sbas_l1.mt7.ai_21",    FT_UINT16, BASE_DEC,  VALS(DEGRADATION_FACTOR_INDICATOR), 0x03c0, NULL, HFILL}},
2117         {&hf_sbas_l1_mt7_ai_22,    {"Degradation Factor Indicator ai_22", "sbas_l1.mt7.ai_22",    FT_UINT16, BASE_DEC,  VALS(DEGRADATION_FACTOR_INDICATOR), 0x3c00, NULL, HFILL}},
2118         {&hf_sbas_l1_mt7_ai_23,    {"Degradation Factor Indicator ai_23", "sbas_l1.mt7.ai_23",    FT_UINT16, BASE_DEC,  VALS(DEGRADATION_FACTOR_INDICATOR), 0x03c0, NULL, HFILL}},
2119         {&hf_sbas_l1_mt7_ai_24,    {"Degradation Factor Indicator ai_24", "sbas_l1.mt7.ai_24",    FT_UINT16, BASE_DEC,  VALS(DEGRADATION_FACTOR_INDICATOR), 0x3c00, NULL, HFILL}},
2120         {&hf_sbas_l1_mt7_ai_25,    {"Degradation Factor Indicator ai_25", "sbas_l1.mt7.ai_25",    FT_UINT16, BASE_DEC,  VALS(DEGRADATION_FACTOR_INDICATOR), 0x03c0, NULL, HFILL}},
2121         {&hf_sbas_l1_mt7_ai_26,    {"Degradation Factor Indicator ai_26", "sbas_l1.mt7.ai_26",    FT_UINT16, BASE_DEC,  VALS(DEGRADATION_FACTOR_INDICATOR), 0x3c00, NULL, HFILL}},
2122         {&hf_sbas_l1_mt7_ai_27,    {"Degradation Factor Indicator ai_27", "sbas_l1.mt7.ai_27",    FT_UINT16, BASE_DEC,  VALS(DEGRADATION_FACTOR_INDICATOR), 0x03c0, NULL, HFILL}},
2123         {&hf_sbas_l1_mt7_ai_28,    {"Degradation Factor Indicator ai_28", "sbas_l1.mt7.ai_28",    FT_UINT16, BASE_DEC,  VALS(DEGRADATION_FACTOR_INDICATOR), 0x3c00, NULL, HFILL}},
2124         {&hf_sbas_l1_mt7_ai_29,    {"Degradation Factor Indicator ai_29", "sbas_l1.mt7.ai_29",    FT_UINT16, BASE_DEC,  VALS(DEGRADATION_FACTOR_INDICATOR), 0x03c0, NULL, HFILL}},
2125         {&hf_sbas_l1_mt7_ai_30,    {"Degradation Factor Indicator ai_30", "sbas_l1.mt7.ai_30",    FT_UINT16, BASE_DEC,  VALS(DEGRADATION_FACTOR_INDICATOR), 0x3c00, NULL, HFILL}},
2126         {&hf_sbas_l1_mt7_ai_31,    {"Degradation Factor Indicator ai_31", "sbas_l1.mt7.ai_31",    FT_UINT16, BASE_DEC,  VALS(DEGRADATION_FACTOR_INDICATOR), 0x03c0, NULL, HFILL}},
2127         {&hf_sbas_l1_mt7_ai_32,    {"Degradation Factor Indicator ai_32", "sbas_l1.mt7.ai_32",    FT_UINT16, BASE_DEC,  VALS(DEGRADATION_FACTOR_INDICATOR), 0x3c00, NULL, HFILL}},
2128         {&hf_sbas_l1_mt7_ai_33,    {"Degradation Factor Indicator ai_33", "sbas_l1.mt7.ai_33",    FT_UINT16, BASE_DEC,  VALS(DEGRADATION_FACTOR_INDICATOR), 0x03c0, NULL, HFILL}},
2129         {&hf_sbas_l1_mt7_ai_34,    {"Degradation Factor Indicator ai_34", "sbas_l1.mt7.ai_34",    FT_UINT16, BASE_DEC,  VALS(DEGRADATION_FACTOR_INDICATOR), 0x3c00, NULL, HFILL}},
2130         {&hf_sbas_l1_mt7_ai_35,    {"Degradation Factor Indicator ai_35", "sbas_l1.mt7.ai_35",    FT_UINT16, BASE_DEC,  VALS(DEGRADATION_FACTOR_INDICATOR), 0x03c0, NULL, HFILL}},
2131         {&hf_sbas_l1_mt7_ai_36,    {"Degradation Factor Indicator ai_36", "sbas_l1.mt7.ai_36",    FT_UINT16, BASE_DEC,  VALS(DEGRADATION_FACTOR_INDICATOR), 0x3c00, NULL, HFILL}},
2132         {&hf_sbas_l1_mt7_ai_37,    {"Degradation Factor Indicator ai_37", "sbas_l1.mt7.ai_37",    FT_UINT16, BASE_DEC,  VALS(DEGRADATION_FACTOR_INDICATOR), 0x03c0, NULL, HFILL}},
2133         {&hf_sbas_l1_mt7_ai_38,    {"Degradation Factor Indicator ai_38", "sbas_l1.mt7.ai_38",    FT_UINT16, BASE_DEC,  VALS(DEGRADATION_FACTOR_INDICATOR), 0x3c00, NULL, HFILL}},
2134         {&hf_sbas_l1_mt7_ai_39,    {"Degradation Factor Indicator ai_39", "sbas_l1.mt7.ai_39",    FT_UINT16, BASE_DEC,  VALS(DEGRADATION_FACTOR_INDICATOR), 0x03c0, NULL, HFILL}},
2135         {&hf_sbas_l1_mt7_ai_40,    {"Degradation Factor Indicator ai_40", "sbas_l1.mt7.ai_40",    FT_UINT16, BASE_DEC,  VALS(DEGRADATION_FACTOR_INDICATOR), 0x3c00, NULL, HFILL}},
2136         {&hf_sbas_l1_mt7_ai_41,    {"Degradation Factor Indicator ai_41", "sbas_l1.mt7.ai_41",    FT_UINT16, BASE_DEC,  VALS(DEGRADATION_FACTOR_INDICATOR), 0x03c0, NULL, HFILL}},
2137         {&hf_sbas_l1_mt7_ai_42,    {"Degradation Factor Indicator ai_42", "sbas_l1.mt7.ai_42",    FT_UINT16, BASE_DEC,  VALS(DEGRADATION_FACTOR_INDICATOR), 0x3c00, NULL, HFILL}},
2138         {&hf_sbas_l1_mt7_ai_43,    {"Degradation Factor Indicator ai_43", "sbas_l1.mt7.ai_43",    FT_UINT16, BASE_DEC,  VALS(DEGRADATION_FACTOR_INDICATOR), 0x03c0, NULL, HFILL}},
2139         {&hf_sbas_l1_mt7_ai_44,    {"Degradation Factor Indicator ai_44", "sbas_l1.mt7.ai_44",    FT_UINT16, BASE_DEC,  VALS(DEGRADATION_FACTOR_INDICATOR), 0x3c00, NULL, HFILL}},
2140         {&hf_sbas_l1_mt7_ai_45,    {"Degradation Factor Indicator ai_45", "sbas_l1.mt7.ai_45",    FT_UINT16, BASE_DEC,  VALS(DEGRADATION_FACTOR_INDICATOR), 0x03c0, NULL, HFILL}},
2141         {&hf_sbas_l1_mt7_ai_46,    {"Degradation Factor Indicator ai_46", "sbas_l1.mt7.ai_46",    FT_UINT16, BASE_DEC,  VALS(DEGRADATION_FACTOR_INDICATOR), 0x3c00, NULL, HFILL}},
2142         {&hf_sbas_l1_mt7_ai_47,    {"Degradation Factor Indicator ai_47", "sbas_l1.mt7.ai_47",    FT_UINT16, BASE_DEC,  VALS(DEGRADATION_FACTOR_INDICATOR), 0x03c0, NULL, HFILL}},
2143         {&hf_sbas_l1_mt7_ai_48,    {"Degradation Factor Indicator ai_48", "sbas_l1.mt7.ai_48",    FT_UINT16, BASE_DEC,  VALS(DEGRADATION_FACTOR_INDICATOR), 0x3c00, NULL, HFILL}},
2144         {&hf_sbas_l1_mt7_ai_49,    {"Degradation Factor Indicator ai_49", "sbas_l1.mt7.ai_49",    FT_UINT16, BASE_DEC,  VALS(DEGRADATION_FACTOR_INDICATOR), 0x03c0, NULL, HFILL}},
2145         {&hf_sbas_l1_mt7_ai_50,    {"Degradation Factor Indicator ai_50", "sbas_l1.mt7.ai_50",    FT_UINT16, BASE_DEC,  VALS(DEGRADATION_FACTOR_INDICATOR), 0x3c00, NULL, HFILL}},
2146         {&hf_sbas_l1_mt7_ai_51,    {"Degradation Factor Indicator ai_51", "sbas_l1.mt7.ai_51",    FT_UINT16, BASE_DEC,  VALS(DEGRADATION_FACTOR_INDICATOR), 0x03c0, NULL, HFILL}},
2147
2148         // MT9
2149         {&hf_sbas_l1_mt9,          {"MT9",                                  "sbas_l1.mt9",          FT_NONE,   BASE_NONE,   NULL,                                0x0,        NULL, HFILL}},
2150         {&hf_sbas_l1_mt9_reserved, {"Reserved",                             "sbas_l1.mt9.reserved", FT_UINT32, BASE_HEX,    NULL,                                0x03fc0000, NULL, HFILL}},
2151         {&hf_sbas_l1_mt9_t_0_geo,  {"t_0,GEO",                              "sbas_l1.mt9.t_0_geo",  FT_UINT32, BASE_CUSTOM, CF_FUNC(&fmt_time_of_applicability), 0x0003ffe0, NULL, HFILL}},
2152         {&hf_sbas_l1_mt9_ura,      {"User Range Accuracy (URA)",            "sbas_l1.mt9.ura",      FT_UINT32, BASE_DEC,    VALS(URA),                           0x0000001e, NULL, HFILL}},
2153         {&hf_sbas_l1_mt9_x_g,      {"X_G",                                  "sbas_l1.mt9.x_g",      FT_INT64,  BASE_CUSTOM, CF_FUNC(&fmt_geo_xy_position2),      0x01fffffff8000000, NULL, HFILL}},
2154         {&hf_sbas_l1_mt9_y_g,      {"Y_G",                                  "sbas_l1.mt9.y_g",      FT_INT64,  BASE_CUSTOM, CF_FUNC(&fmt_geo_xy_position2),      0x07ffffffe0000000, NULL, HFILL}},
2155         {&hf_sbas_l1_mt9_z_g,      {"Z_G",                                  "sbas_l1.mt9.z_g",      FT_INT64,  BASE_CUSTOM, CF_FUNC(&fmt_geo_z_position2),       0x1ffffff000000000, NULL, HFILL}},
2156         {&hf_sbas_l1_mt9_x_g_vel,  {"X_G velocity",                         "sbas_l1.mt9.x_g_vel",  FT_INT32,  BASE_CUSTOM, CF_FUNC(&fmt_geo_xy_velocity2),      0x0ffff800,         NULL, HFILL}},
2157         {&hf_sbas_l1_mt9_y_g_vel,  {"Y_G velocity",                         "sbas_l1.mt9.y_g_vel",  FT_INT32,  BASE_CUSTOM, CF_FUNC(&fmt_geo_xy_velocity2),      0x07fffc00,         NULL, HFILL}},
2158         {&hf_sbas_l1_mt9_z_g_vel,  {"Z_G velocity",                         "sbas_l1.mt9.z_g_vel",  FT_INT32,  BASE_CUSTOM, CF_FUNC(&fmt_geo_z_velocity2),       0x03ffff00,         NULL, HFILL}},
2159         {&hf_sbas_l1_mt9_x_g_acc,  {"X_G acceleration",                     "sbas_l1.mt9.x_g_acc",  FT_INT32,  BASE_CUSTOM, CF_FUNC(&fmt_geo_xy_acceleration),   0xffc00000,         NULL, HFILL}},
2160         {&hf_sbas_l1_mt9_y_g_acc,  {"Y_G acceleration",                     "sbas_l1.mt9.y_g_acc",  FT_INT32,  BASE_CUSTOM, CF_FUNC(&fmt_geo_xy_acceleration),   0x003ff000,         NULL, HFILL}},
2161         {&hf_sbas_l1_mt9_z_g_acc,  {"Z_G acceleration",                     "sbas_l1.mt9.z_g_acc",  FT_INT32,  BASE_CUSTOM, CF_FUNC(&fmt_geo_z_acceleration),    0x00000ffc,         NULL, HFILL}},
2162         {&hf_sbas_l1_mt9_a_gf0,    {"Time offset of the GEO clock (a_Gf0)", "sbas_l1.mt9.a_gf0",    FT_INT32,  BASE_CUSTOM, CF_FUNC(&fmt_clock_correction),      0x03ffc000,         NULL, HFILL}},
2163         {&hf_sbas_l1_mt9_a_gf1,    {"Drift rate of the GEO clock (a_Gf1)",  "sbas_l1.mt9.a_gf1",    FT_INT32,  BASE_CUSTOM, CF_FUNC(&fmt_clk_rate_correction2),  0x00003fc0,         NULL, HFILL}},
2164
2165         // MT17
2166         {&hf_sbas_l1_mt17,                                                {"MT17",                                   "sbas_l1.mt17",                                                FT_NONE,    BASE_NONE,   NULL,                          0x0,        NULL, HFILL}},
2167         {&hf_sbas_l1_mt17_reserved,                                       {"Reserved",                               "sbas_l1.mt17.reserved",                                       FT_UINT8,   BASE_HEX,    NULL,                          0xc0,       NULL, HFILL}},
2168         {&hf_sbas_l1_mt17_prn,                                            {"PRN",                                    "sbas_l1.mt17.prn",                                            FT_UINT16,  BASE_DEC,    NULL,                          0x3fc0,     NULL, HFILL}},
2169         {&hf_sbas_l1_mt17_health_and_status,                              {"Health and Status",                      "sbas_l1.mt17.health_and_status",                              FT_UINT16,  BASE_HEX,    NULL,                          0x3fc0,     NULL, HFILL}},
2170         {&hf_sbas_l1_mt17_health_and_status_spid,                         {"Service Provider Identifier",            "sbas_l1.mt17.health_and_status.spid",                         FT_UINT16,  BASE_DEC,    VALS(SBAS_SPID),               0x3c00,     NULL, HFILL}},
2171         {&hf_sbas_l1_mt17_health_and_status_spare,                        {"Spare",                                  "sbas_l1.mt17.health_and_status.spare",                        FT_UINT16,  BASE_HEX,    NULL,                          0x0200,     NULL, HFILL}},
2172         {&hf_sbas_l1_mt17_health_and_status_sat_status_basic_corrections, {"Satellite Status and Basic Corrections", "sbas_l1.mt17.health_and_status.sat_status_basic_corrections", FT_BOOLEAN, 16,          TFS(&tfs_off_on),              0x0100,     NULL, HFILL}},
2173         {&hf_sbas_l1_mt17_health_and_status_precision_corrections,        {"Precision Corrections",                  "sbas_l1.mt17.health_and_status.precision_corrections",        FT_BOOLEAN, 16,          TFS(&tfs_off_on),              0x0080,     NULL, HFILL}},
2174         {&hf_sbas_l1_mt17_health_and_status_ranging,                      {"Ranging",                                "sbas_l1.mt17.health_and_status.ranging",                      FT_BOOLEAN, 16,          TFS(&tfs_off_on),              0x0040,     NULL, HFILL}},
2175         {&hf_sbas_l1_mt17_x_ga,                                           {"X_G,A",                                  "sbas_l1.mt17.x_ga",                                           FT_INT32,   BASE_CUSTOM, CF_FUNC(&fmt_geo_xy_position), 0x3fff8000, NULL, HFILL}},
2176         {&hf_sbas_l1_mt17_y_ga,                                           {"Y_G,A",                                  "sbas_l1.mt17.y_ga",                                           FT_INT32,   BASE_CUSTOM, CF_FUNC(&fmt_geo_xy_position), 0x7fff0000, NULL, HFILL}},
2177         {&hf_sbas_l1_mt17_z_ga,                                           {"Z_G,A",                                  "sbas_l1.mt17.z_ga",                                           FT_INT32,   BASE_CUSTOM, CF_FUNC(&fmt_geo_z_position),  0x0000ff80, NULL, HFILL}},
2178         {&hf_sbas_l1_mt17_x_ga_vel,                                       {"X_G,A velocity",                         "sbas_l1.mt17.x_ga_vel",                                       FT_INT32,   BASE_CUSTOM, CF_FUNC(&fmt_geo_xy_velocity), 0x00000070, NULL, HFILL}},
2179         {&hf_sbas_l1_mt17_y_ga_vel,                                       {"Y_G,A velocity",                         "sbas_l1.mt17.y_ga_vel",                                       FT_INT32,   BASE_CUSTOM, CF_FUNC(&fmt_geo_xy_velocity), 0x0000000e, NULL, HFILL}},
2180         {&hf_sbas_l1_mt17_z_ga_vel,                                       {"Z_G,A velocity",                         "sbas_l1.mt17.z_ga_vel",                                       FT_INT32,   BASE_CUSTOM, CF_FUNC(&fmt_geo_z_velocity),  0x000001e0, NULL, HFILL}},
2181         {&hf_sbas_l1_mt17_t_a,                                            {"t_almanac",                              "sbas_l1.mt17.t_a",                                            FT_UINT32,  BASE_CUSTOM, CF_FUNC(&fmt_time_of_almanac), 0x0001ffc0, NULL, HFILL}},
2182
2183         // MT18
2184         {&hf_sbas_l1_mt18,                {"MT18",                                "sbas_l1.mt18",                FT_NONE,   BASE_NONE, NULL, 0x0,                NULL, HFILL}},
2185         {&hf_sbas_l1_mt18_nr_igp_bands,   {"Number of IGP Bands",                 "sbas_l1.mt18.nr_igp_bands",   FT_UINT16, BASE_DEC,  NULL, 0x03c0,             NULL, HFILL}},
2186         {&hf_sbas_l1_mt18_igp_band_id,    {"IGP Band ID",                         "sbas_l1.mt18.igp_band_id",    FT_UINT16, BASE_DEC,  NULL, 0x003c,             NULL, HFILL}},
2187         {&hf_sbas_l1_mt18_iodi_k,         {"Issue of Data - Ionosphere (IODI_k)", "sbas_l1.mt18.iodi_k",         FT_UINT16, BASE_DEC,  NULL, 0x0003,             NULL, HFILL}},
2188         {&hf_sbas_l1_mt18_igp_mask_180w,  {"IGP Mask 180W /  75S -  85N",         "sbas_l1.mt18.igp_mask_180w",  FT_UINT64, BASE_HEX,  NULL, 0xfffffff000000000, NULL, HFILL}},
2189         {&hf_sbas_l1_mt18_igp_mask_175w,  {"IGP Mask 175W /  55S -  55N",         "sbas_l1.mt18.igp_mask_175w",  FT_UINT64, BASE_HEX,  NULL, 0x0000000fffffe000, NULL, HFILL}},
2190         {&hf_sbas_l1_mt18_igp_mask_170w,  {"IGP Mask 170W /  75S -  75N",         "sbas_l1.mt18.igp_mask_170w",  FT_UINT64, BASE_HEX,  NULL, 0x1ffffffc00000000, NULL, HFILL}},
2191         {&hf_sbas_l1_mt18_igp_mask_165w,  {"IGP Mask 165W /  55S -  55N",         "sbas_l1.mt18.igp_mask_165w",  FT_UINT64, BASE_HEX,  NULL, 0x00000003fffff800, NULL, HFILL}},
2192         {&hf_sbas_l1_mt18_igp_mask_160w,  {"IGP Mask 160W /  75S -  75N",         "sbas_l1.mt18.igp_mask_160w",  FT_UINT64, BASE_HEX,  NULL, 0x07ffffff00000000, NULL, HFILL}},
2193         {&hf_sbas_l1_mt18_igp_mask_155w,  {"IGP Mask 155W /  55S -  55N",         "sbas_l1.mt18.igp_mask_155w",  FT_UINT64, BASE_HEX,  NULL, 0x00000000fffffe00, NULL, HFILL}},
2194         {&hf_sbas_l1_mt18_igp_mask_150w,  {"IGP Mask 150W /  75S -  75N",         "sbas_l1.mt18.igp_mask_150w",  FT_UINT64, BASE_HEX,  NULL, 0x01ffffffc0000000, NULL, HFILL}},
2195         {&hf_sbas_l1_mt18_igp_mask_145w,  {"IGP Mask 145W /  55S -  55N",         "sbas_l1.mt18.igp_mask_145w",  FT_UINT64, BASE_HEX,  NULL, 0x000000003fffff80, NULL, HFILL}},
2196         {&hf_sbas_l1_mt18_igp_mask_140w,  {"IGP Mask 140W /  85S -  75N",         "sbas_l1.mt18.igp_mask_i40w",  FT_UINT64, BASE_HEX,  NULL, 0xfffffff000000000, NULL, HFILL}},
2197         {&hf_sbas_l1_mt18_igp_mask_135w,  {"IGP Mask 135W /  55S -  55N",         "sbas_l1.mt18.igp_mask_135w",  FT_UINT64, BASE_HEX,  NULL, 0x0000000fffffe000, NULL, HFILL}},
2198         {&hf_sbas_l1_mt18_igp_mask_130w,  {"IGP Mask 130W /  75S -  75N",         "sbas_l1.mt18.igp_mask_130w",  FT_UINT64, BASE_HEX,  NULL, 0x1ffffffc00000000, NULL, HFILL}},
2199         {&hf_sbas_l1_mt18_igp_mask_125w,  {"IGP Mask 125W /  55S -  55N",         "sbas_l1.mt18.igp_mask_125w",  FT_UINT64, BASE_HEX,  NULL, 0x00000003fffff800, NULL, HFILL}},
2200         {&hf_sbas_l1_mt18_igp_mask_120w,  {"IGP Mask 120W /  75S -  75N",         "sbas_l1.mt18.igp_mask_120w",  FT_UINT64, BASE_HEX,  NULL, 0x07ffffff00000000, NULL, HFILL}},
2201         {&hf_sbas_l1_mt18_igp_mask_115w,  {"IGP Mask 115W /  55S -  55N",         "sbas_l1.mt18.igp_mask_115w",  FT_UINT64, BASE_HEX,  NULL, 0x00000000fffffe00, NULL, HFILL}},
2202         {&hf_sbas_l1_mt18_igp_mask_110w,  {"IGP Mask 110W /  75S -  75N",         "sbas_l1.mt18.igp_mask_110w",  FT_UINT64, BASE_HEX,  NULL, 0x01ffffffc0000000, NULL, HFILL}},
2203         {&hf_sbas_l1_mt18_igp_mask_105w,  {"IGP Mask 105W /  55S -  55N",         "sbas_l1.mt18.igp_mask_105w",  FT_UINT64, BASE_HEX,  NULL, 0x000000003fffff80, NULL, HFILL}},
2204         {&hf_sbas_l1_mt18_igp_mask_100w,  {"IGP Mask 100W /  75S -  75N",         "sbas_l1.mt18.igp_mask_i00w",  FT_UINT64, BASE_HEX,  NULL, 0xffffffe000000000, NULL, HFILL}},
2205         {&hf_sbas_l1_mt18_igp_mask_95w,   {"IGP Mask  95W /  55S -  55N",         "sbas_l1.mt18.igp_mask_95w",   FT_UINT64, BASE_HEX,  NULL, 0x0000001fffffc000, NULL, HFILL}},
2206         {&hf_sbas_l1_mt18_igp_mask_90w,   {"IGP Mask  90W /  75S -  85N",         "sbas_l1.mt18.igp_mask_90w",   FT_UINT64, BASE_HEX,  NULL, 0x3ffffffc00000000, NULL, HFILL}},
2207         {&hf_sbas_l1_mt18_igp_mask_85w,   {"IGP Mask  85W /  55S -  55N",         "sbas_l1.mt18.igp_mask_85w",   FT_UINT64, BASE_HEX,  NULL, 0x00000003fffff800, NULL, HFILL}},
2208         {&hf_sbas_l1_mt18_igp_mask_80w,   {"IGP Mask  80W /  75S -  75N",         "sbas_l1.mt18.igp_mask_80w",   FT_UINT64, BASE_HEX,  NULL, 0x07ffffff00000000, NULL, HFILL}},
2209         {&hf_sbas_l1_mt18_igp_mask_75w,   {"IGP Mask  75W /  55S -  55N",         "sbas_l1.mt18.igp_mask_75w",   FT_UINT64, BASE_HEX,  NULL, 0x00000000fffffe00, NULL, HFILL}},
2210         {&hf_sbas_l1_mt18_igp_mask_70w,   {"IGP Mask  70W /  75S -  75N",         "sbas_l1.mt18.igp_mask_70w",   FT_UINT64, BASE_HEX,  NULL, 0x01ffffffc0000000, NULL, HFILL}},
2211         {&hf_sbas_l1_mt18_igp_mask_65w,   {"IGP Mask  65W /  55S -  55N",         "sbas_l1.mt18.igp_mask_65w",   FT_UINT64, BASE_HEX,  NULL, 0x000000003fffff80, NULL, HFILL}},
2212         {&hf_sbas_l1_mt18_igp_mask_60w,   {"IGP Mask  60W /  75S -  75N",         "sbas_l1.mt18.igp_mask_60w",   FT_UINT64, BASE_HEX,  NULL, 0xffffffe000000000, NULL, HFILL}},
2213         {&hf_sbas_l1_mt18_igp_mask_55w,   {"IGP Mask  55W /  55S -  55N",         "sbas_l1.mt18.igp_mask_55w",   FT_UINT64, BASE_HEX,  NULL, 0x0000001fffffc000, NULL, HFILL}},
2214         {&hf_sbas_l1_mt18_igp_mask_50w,   {"IGP Mask  50W /  85S -  75N",         "sbas_l1.mt18.igp_mask_50w",   FT_UINT64, BASE_HEX,  NULL, 0x3ffffffc00000000, NULL, HFILL}},
2215         {&hf_sbas_l1_mt18_igp_mask_45w,   {"IGP Mask  45W /  55S -  55N",         "sbas_l1.mt18.igp_mask_45w",   FT_UINT64, BASE_HEX,  NULL, 0x00000003fffff800, NULL, HFILL}},
2216         {&hf_sbas_l1_mt18_igp_mask_40w,   {"IGP Mask  40W /  75S -  75N",         "sbas_l1.mt18.igp_mask_40w",   FT_UINT64, BASE_HEX,  NULL, 0x07ffffff00000000, NULL, HFILL}},
2217         {&hf_sbas_l1_mt18_igp_mask_35w,   {"IGP Mask  35W /  55S -  55N",         "sbas_l1.mt18.igp_mask_35w",   FT_UINT64, BASE_HEX,  NULL, 0x00000000fffffe00, NULL, HFILL}},
2218         {&hf_sbas_l1_mt18_igp_mask_30w,   {"IGP Mask  30W /  75S -  75N",         "sbas_l1.mt18.igp_mask_30w",   FT_UINT64, BASE_HEX,  NULL, 0x01ffffffc0000000, NULL, HFILL}},
2219         {&hf_sbas_l1_mt18_igp_mask_25w,   {"IGP Mask  25W /  55S -  55N",         "sbas_l1.mt18.igp_mask_25w",   FT_UINT64, BASE_HEX,  NULL, 0x000000003fffff80, NULL, HFILL}},
2220         {&hf_sbas_l1_mt18_igp_mask_20w,   {"IGP Mask  20W /  75S -  75N",         "sbas_l1.mt18.igp_mask_20w",   FT_UINT64, BASE_HEX,  NULL, 0xffffffe000000000, NULL, HFILL}},
2221         {&hf_sbas_l1_mt18_igp_mask_15w,   {"IGP Mask  15W /  55S -  55N",         "sbas_l1.mt18.igp_mask_15w",   FT_UINT64, BASE_HEX,  NULL, 0x0000001fffffc000, NULL, HFILL}},
2222         {&hf_sbas_l1_mt18_igp_mask_10w,   {"IGP Mask  10W /  75S -  75N",         "sbas_l1.mt18.igp_mask_10w",   FT_UINT64, BASE_HEX,  NULL, 0x3ffffff800000000, NULL, HFILL}},
2223         {&hf_sbas_l1_mt18_igp_mask_5w,    {"IGP Mask   5W /  55S -  55N",         "sbas_l1.mt18.igp_mask_5w",    FT_UINT64, BASE_HEX,  NULL, 0x00000007fffff000, NULL, HFILL}},
2224         {&hf_sbas_l1_mt18_igp_mask_0,     {"IGP Mask    0 /  75S -  85N",         "sbas_l1.mt18.igp_mask_0",     FT_UINT64, BASE_HEX,  NULL, 0x0fffffff00000000, NULL, HFILL}},
2225         {&hf_sbas_l1_mt18_igp_mask_5e,    {"IGP Mask   5E /  55S -  55N",         "sbas_l1.mt18.igp_mask_5e",    FT_UINT64, BASE_HEX,  NULL, 0x00000000fffffe00, NULL, HFILL}},
2226         {&hf_sbas_l1_mt18_igp_mask_10e,   {"IGP Mask  10E /  75S -  75N",         "sbas_l1.mt18.igp_mask_10e",   FT_UINT64, BASE_HEX,  NULL, 0x01ffffffc0000000, NULL, HFILL}},
2227         {&hf_sbas_l1_mt18_igp_mask_15e,   {"IGP Mask  15E /  55S -  55N",         "sbas_l1.mt18.igp_mask_15e",   FT_UINT64, BASE_HEX,  NULL, 0x000000003fffff80, NULL, HFILL}},
2228         {&hf_sbas_l1_mt18_igp_mask_20e,   {"IGP Mask  20E /  75S -  75N",         "sbas_l1.mt18.igp_mask_20e",   FT_UINT64, BASE_HEX,  NULL, 0xffffffe000000000, NULL, HFILL}},
2229         {&hf_sbas_l1_mt18_igp_mask_25e,   {"IGP Mask  25E /  55S -  55N",         "sbas_l1.mt18.igp_mask_25e",   FT_UINT64, BASE_HEX,  NULL, 0x0000001fffffc000, NULL, HFILL}},
2230         {&hf_sbas_l1_mt18_igp_mask_30e,   {"IGP Mask  30E /  75S -  75N",         "sbas_l1.mt18.igp_mask_30e",   FT_UINT64, BASE_HEX,  NULL, 0x3ffffff800000000, NULL, HFILL}},
2231         {&hf_sbas_l1_mt18_igp_mask_35e,   {"IGP Mask  35E /  55S -  55N",         "sbas_l1.mt18.igp_mask_35e",   FT_UINT64, BASE_HEX,  NULL, 0x00000007fffff000, NULL, HFILL}},
2232         {&hf_sbas_l1_mt18_igp_mask_40e,   {"IGP Mask  40E /  85S -  75N",         "sbas_l1.mt18.igp_mask_40e",   FT_UINT64, BASE_HEX,  NULL, 0x0fffffff00000000, NULL, HFILL}},
2233         {&hf_sbas_l1_mt18_igp_mask_45e,   {"IGP Mask  45E /  55S -  55N",         "sbas_l1.mt18.igp_mask_45e",   FT_UINT64, BASE_HEX,  NULL, 0x00000000fffffe00, NULL, HFILL}},
2234         {&hf_sbas_l1_mt18_igp_mask_50e,   {"IGP Mask  50E /  75S -  75N",         "sbas_l1.mt18.igp_mask_50e",   FT_UINT64, BASE_HEX,  NULL, 0x01ffffffc0000000, NULL, HFILL}},
2235         {&hf_sbas_l1_mt18_igp_mask_55e,   {"IGP Mask  55E /  55S -  55N",         "sbas_l1.mt18.igp_mask_55e",   FT_UINT64, BASE_HEX,  NULL, 0x000000003fffff80, NULL, HFILL}},
2236         {&hf_sbas_l1_mt18_igp_mask_60e,   {"IGP Mask  60E /  75S -  75N",         "sbas_l1.mt18.igp_mask_60e",   FT_UINT64, BASE_HEX,  NULL, 0xffffffe000000000, NULL, HFILL}},
2237         {&hf_sbas_l1_mt18_igp_mask_65e,   {"IGP Mask  65E /  55S -  55N",         "sbas_l1.mt18.igp_mask_65e",   FT_UINT64, BASE_HEX,  NULL, 0x0000001fffffc000, NULL, HFILL}},
2238         {&hf_sbas_l1_mt18_igp_mask_70e,   {"IGP Mask  70E /  75S -  75N",         "sbas_l1.mt18.igp_mask_70e",   FT_UINT64, BASE_HEX,  NULL, 0x3ffffff800000000, NULL, HFILL}},
2239         {&hf_sbas_l1_mt18_igp_mask_75e,   {"IGP Mask  75E /  55S -  55N",         "sbas_l1.mt18.igp_mask_75e",   FT_UINT64, BASE_HEX,  NULL, 0x00000007fffff000, NULL, HFILL}},
2240         {&hf_sbas_l1_mt18_igp_mask_80e,   {"IGP Mask  80E /  75S -  75N",         "sbas_l1.mt18.igp_mask_80e",   FT_UINT64, BASE_HEX,  NULL, 0x0ffffffe00000000, NULL, HFILL}},
2241         {&hf_sbas_l1_mt18_igp_mask_85e,   {"IGP Mask  85E /  55S -  55N",         "sbas_l1.mt18.igp_mask_85e",   FT_UINT64, BASE_HEX,  NULL, 0x00000001fffffc00, NULL, HFILL}},
2242         {&hf_sbas_l1_mt18_igp_mask_90e,   {"IGP Mask  90E /  75S -  85N",         "sbas_l1.mt18.igp_mask_90e",   FT_UINT64, BASE_HEX,  NULL, 0x03ffffffc0000000, NULL, HFILL}},
2243         {&hf_sbas_l1_mt18_igp_mask_95e,   {"IGP Mask  95E /  55S -  55N",         "sbas_l1.mt18.igp_mask_95e",   FT_UINT64, BASE_HEX,  NULL, 0x000000003fffff80, NULL, HFILL}},
2244         {&hf_sbas_l1_mt18_igp_mask_100e,  {"IGP Mask 100E /  75S -  75N",         "sbas_l1.mt18.igp_mask_100e",  FT_UINT64, BASE_HEX,  NULL, 0xffffffe000000000, NULL, HFILL}},
2245         {&hf_sbas_l1_mt18_igp_mask_105e,  {"IGP Mask 105E /  55S -  55N",         "sbas_l1.mt18.igp_mask_105e",  FT_UINT64, BASE_HEX,  NULL, 0x0000001fffffc000, NULL, HFILL}},
2246         {&hf_sbas_l1_mt18_igp_mask_110e,  {"IGP Mask 110E /  75S -  75N",         "sbas_l1.mt18.igp_mask_110e",  FT_UINT64, BASE_HEX,  NULL, 0x3ffffff800000000, NULL, HFILL}},
2247         {&hf_sbas_l1_mt18_igp_mask_115e,  {"IGP Mask 115E /  55S -  55N",         "sbas_l1.mt18.igp_mask_115e",  FT_UINT64, BASE_HEX,  NULL, 0x00000007fffff000, NULL, HFILL}},
2248         {&hf_sbas_l1_mt18_igp_mask_120e,  {"IGP Mask 120E /  75S -  75N",         "sbas_l1.mt18.igp_mask_120e",  FT_UINT64, BASE_HEX,  NULL, 0x0ffffffe00000000, NULL, HFILL}},
2249         {&hf_sbas_l1_mt18_igp_mask_125e,  {"IGP Mask 125E /  55S -  55N",         "sbas_l1.mt18.igp_mask_125e",  FT_UINT64, BASE_HEX,  NULL, 0x00000001fffffc00, NULL, HFILL}},
2250         {&hf_sbas_l1_mt18_igp_mask_130e,  {"IGP Mask 130E /  85S -  75N",         "sbas_l1.mt18.igp_mask_130e",  FT_UINT64, BASE_HEX,  NULL, 0x03ffffffc0000000, NULL, HFILL}},
2251         {&hf_sbas_l1_mt18_igp_mask_135e,  {"IGP Mask 135E /  55S -  55N",         "sbas_l1.mt18.igp_mask_135e",  FT_UINT64, BASE_HEX,  NULL, 0x000000003fffff80, NULL, HFILL}},
2252         {&hf_sbas_l1_mt18_igp_mask_140e,  {"IGP Mask 140E /  75S -  75N",         "sbas_l1.mt18.igp_mask_140e",  FT_UINT64, BASE_HEX,  NULL, 0xffffffe000000000, NULL, HFILL}},
2253         {&hf_sbas_l1_mt18_igp_mask_145e,  {"IGP Mask 145E /  55S -  55N",         "sbas_l1.mt18.igp_mask_145e",  FT_UINT64, BASE_HEX,  NULL, 0x0000001fffffc000, NULL, HFILL}},
2254         {&hf_sbas_l1_mt18_igp_mask_150e,  {"IGP Mask 150E /  75S -  75N",         "sbas_l1.mt18.igp_mask_150e",  FT_UINT64, BASE_HEX,  NULL, 0x3ffffff800000000, NULL, HFILL}},
2255         {&hf_sbas_l1_mt18_igp_mask_155e,  {"IGP Mask 155E /  55S -  55N",         "sbas_l1.mt18.igp_mask_155e",  FT_UINT64, BASE_HEX,  NULL, 0x00000007fffff000, NULL, HFILL}},
2256         {&hf_sbas_l1_mt18_igp_mask_160e,  {"IGP Mask 160E /  75S -  75N",         "sbas_l1.mt18.igp_mask_160e",  FT_UINT64, BASE_HEX,  NULL, 0x0ffffffe00000000, NULL, HFILL}},
2257         {&hf_sbas_l1_mt18_igp_mask_165e,  {"IGP Mask 165E /  55S -  55N",         "sbas_l1.mt18.igp_mask_165e",  FT_UINT64, BASE_HEX,  NULL, 0x00000001fffffc00, NULL, HFILL}},
2258         {&hf_sbas_l1_mt18_igp_mask_170e,  {"IGP Mask 170E /  75S -  75N",         "sbas_l1.mt18.igp_mask_170e",  FT_UINT64, BASE_HEX,  NULL, 0x03ffffff80000000, NULL, HFILL}},
2259         {&hf_sbas_l1_mt18_igp_mask_175e,  {"IGP Mask 175E /  55S -  55N",         "sbas_l1.mt18.igp_mask_175e",  FT_UINT64, BASE_HEX,  NULL, 0x000000007fffff00, NULL, HFILL}},
2260         {&hf_sbas_l1_mt18_igp_mask_60n_1, {"IGP Mask  60N / 180W -   5W",         "sbas_l1.mt18.igp_mask_60n_1", FT_UINT64, BASE_HEX,  NULL, 0xfffffffff0000000, NULL, HFILL}},
2261         {&hf_sbas_l1_mt18_igp_mask_60n_2, {"IGP Mask  60N /   5E - 175E",         "sbas_l1.mt18.igp_mask_60n_2", FT_UINT64, BASE_HEX,  NULL, 0x0000000fffffffff, NULL, HFILL}},
2262         {&hf_sbas_l1_mt18_igp_mask_65n,   {"IGP Mask  65N / 180W - 170E",         "sbas_l1.mt18.igp_mask_65n",   FT_UINT64, BASE_HEX,  NULL, 0xfffffffff0000000, NULL, HFILL}},
2263         {&hf_sbas_l1_mt18_igp_mask_70n,   {"IGP Mask  70N / 180W - 170E",         "sbas_l1.mt18.igp_mask_70n",   FT_UINT64, BASE_HEX,  NULL, 0x0000000fffffffff, NULL, HFILL}},
2264         {&hf_sbas_l1_mt18_igp_mask_75n,   {"IGP Mask  75N / 180W - 170E",         "sbas_l1.mt18.igp_mask_75n",   FT_UINT64, BASE_HEX,  NULL, 0xfffffffff0000000, NULL, HFILL}},
2265         {&hf_sbas_l1_mt18_igp_mask_85n,   {"IGP Mask  85N / 180W - 150E",         "sbas_l1.mt18.igp_mask_85n",   FT_UINT64, BASE_HEX,  NULL, 0x000000000fff0000, NULL, HFILL}},
2266         {&hf_sbas_l1_mt18_igp_mask_60s_1, {"IGP Mask  60S / 180W -   5W",         "sbas_l1.mt18.igp_mask_60s_1", FT_UINT64, BASE_HEX,  NULL, 0xfffffffff0000000, NULL, HFILL}},
2267         {&hf_sbas_l1_mt18_igp_mask_60s_2, {"IGP Mask  60S /   5E - 175E",         "sbas_l1.mt18.igp_mask_60s_2", FT_UINT64, BASE_HEX,  NULL, 0x0000000fffffffff, NULL, HFILL}},
2268         {&hf_sbas_l1_mt18_igp_mask_65s,   {"IGP Mask  65S / 180W - 170E",         "sbas_l1.mt18.igp_mask_65s",   FT_UINT64, BASE_HEX,  NULL, 0xfffffffff0000000, NULL, HFILL}},
2269         {&hf_sbas_l1_mt18_igp_mask_70s,   {"IGP Mask  70S / 180W - 170E",         "sbas_l1.mt18.igp_mask_70s",   FT_UINT64, BASE_HEX,  NULL, 0x0000000fffffffff, NULL, HFILL}},
2270         {&hf_sbas_l1_mt18_igp_mask_75s,   {"IGP Mask  75S / 180W - 170E",         "sbas_l1.mt18.igp_mask_75s",   FT_UINT64, BASE_HEX,  NULL, 0xfffffffff0000000, NULL, HFILL}},
2271         {&hf_sbas_l1_mt18_igp_mask_85s,   {"IGP Mask  85S / 170W - 160E",         "sbas_l1.mt18.igp_mask_85s",   FT_UINT64, BASE_HEX,  NULL, 0x000000000fff0000, NULL, HFILL}},
2272         {&hf_sbas_l1_mt18_spare,          {"Spare",                               "sbas_l1.mt18.spare",          FT_UINT8,  BASE_HEX,  NULL, 0x40,               NULL, HFILL}},
2273
2274         // MT24
2275         {&hf_sbas_l1_mt24,                  {"MT24",                                     "sbas_l1.mt24",                  FT_NONE,   BASE_NONE,   NULL,                          0x0,        NULL, HFILL}},
2276         {&hf_sbas_l1_mt24_fc_i1,            {"Fast Correction i1 (FC_i1)",               "sbas_l1.mt24.fc_i1",            FT_INT32,  BASE_CUSTOM, CF_FUNC(&fmt_correction_125m), 0x03ffc000, NULL, HFILL}},
2277         {&hf_sbas_l1_mt24_fc_i2,            {"Fast Correction i2 (FC_i2)",               "sbas_l1.mt24.fc_i2",            FT_INT32,  BASE_CUSTOM, CF_FUNC(&fmt_correction_125m), 0x3ffc0000, NULL, HFILL}},
2278         {&hf_sbas_l1_mt24_fc_i3,            {"Fast Correction i3 (FC_i3)",               "sbas_l1.mt24.fc_i3",            FT_INT32,  BASE_CUSTOM, CF_FUNC(&fmt_correction_125m), 0x03ffc000, NULL, HFILL}},
2279         {&hf_sbas_l1_mt24_fc_i4,            {"Fast Correction i4 (FC_i4)",               "sbas_l1.mt24.fc_i4",            FT_INT32,  BASE_CUSTOM, CF_FUNC(&fmt_correction_125m), 0x3ffc0000, NULL, HFILL}},
2280         {&hf_sbas_l1_mt24_fc_i5,            {"Fast Correction i5 (FC_i5)",               "sbas_l1.mt24.fc_i5",            FT_INT32,  BASE_CUSTOM, CF_FUNC(&fmt_correction_125m), 0x03ffc000, NULL, HFILL}},
2281         {&hf_sbas_l1_mt24_fc_i6,            {"Fast Correction i6 (FC_i6)",               "sbas_l1.mt24.fc_i6",            FT_INT32,  BASE_CUSTOM, CF_FUNC(&fmt_correction_125m), 0x3ffc0000, NULL, HFILL}},
2282         {&hf_sbas_l1_mt24_udrei_i1,         {"UDREI_i1",                                 "sbas_l1.mt24.udrei_i1",         FT_UINT16, BASE_DEC,    VALS(UDREI_EVALUATION),        0x03c0,     NULL, HFILL}},
2283         {&hf_sbas_l1_mt24_udrei_i2,         {"UDREI_i2",                                 "sbas_l1.mt24.udrei_i2",         FT_UINT16, BASE_DEC,    VALS(UDREI_EVALUATION),        0x3c00,     NULL, HFILL}},
2284         {&hf_sbas_l1_mt24_udrei_i3,         {"UDREI_i3",                                 "sbas_l1.mt24.udrei_i3",         FT_UINT16, BASE_DEC,    VALS(UDREI_EVALUATION),        0x03c0,     NULL, HFILL}},
2285         {&hf_sbas_l1_mt24_udrei_i4,         {"UDREI_i4",                                 "sbas_l1.mt24.udrei_i4",         FT_UINT16, BASE_DEC,    VALS(UDREI_EVALUATION),        0x3c00,     NULL, HFILL}},
2286         {&hf_sbas_l1_mt24_udrei_i5,         {"UDREI_i5",                                 "sbas_l1.mt24.udrei_i5",         FT_UINT16, BASE_DEC,    VALS(UDREI_EVALUATION),        0x03c0,     NULL, HFILL}},
2287         {&hf_sbas_l1_mt24_udrei_i6,         {"UDREI_i6",                                 "sbas_l1.mt24.udrei_i6",         FT_UINT16, BASE_DEC,    VALS(UDREI_EVALUATION),        0x3c00,     NULL, HFILL}},
2288         {&hf_sbas_l1_mt24_iodp,             {"Issue of Data - PRN (IODP)",               "sbas_l1.mt24.iodp",             FT_UINT8,  BASE_DEC,    NULL,                          0x03,   NULL, HFILL}},
2289         {&hf_sbas_l1_mt24_fc_type,          {"Fast Correction Type ID",                  "sbas_l1.mt24.fc_type",          FT_UINT8,  BASE_DEC,    NULL,                          0xc0,   NULL, HFILL}},
2290         {&hf_sbas_l1_mt24_iodf_j,           {"Issue of Data - Fast Correction (IODF_j)", "sbas_l1.mt24.iodf_j",           FT_UINT8,  BASE_DEC,    NULL,                          0x30,       NULL, HFILL}},
2291         {&hf_sbas_l1_mt24_spare,            {"Spare",                                    "sbas_l1.mt24.spare",            FT_UINT8,  BASE_DEC,    NULL,                           0x0f,    NULL, HFILL}},
2292         {&hf_sbas_l1_mt24_velocity_code,    {"Velocity Code",                            "sbas_l1.mt24.velocity_code",    FT_UINT8,  BASE_DEC,    NULL,                           0x80,   NULL, HFILL}},
2293         {&hf_sbas_l1_mt24_v0_prn_mask_nr_1, {"PRN Mask Number",                          "sbas_l1.mt24.v0.prn_mask_nr_1", FT_UINT8,  BASE_DEC,    NULL,                           0x7e, NULL, HFILL}},
2294         {&hf_sbas_l1_mt24_v0_iod_1,         {"Issue of Data (IOD_i)",                    "sbas_l1.mt24.v0.iod_1",         FT_UINT16, BASE_DEC,    NULL,                           0x01fe, NULL, HFILL}},
2295         {&hf_sbas_l1_mt24_v0_delta_x_1,     {"dx_i",                                     "sbas_l1.mt24.v0.dx_1",          FT_INT16,  BASE_CUSTOM, CF_FUNC(&fmt_correction_125m),  0x01ff, NULL, HFILL}},
2296         {&hf_sbas_l1_mt24_v0_delta_y_1,     {"dy_i",                                     "sbas_l1.mt24.v0.dy_1",          FT_INT16,  BASE_CUSTOM, CF_FUNC(&fmt_correction_125m),  0xff80, NULL, HFILL}},
2297         {&hf_sbas_l1_mt24_v0_delta_z_1,     {"dz_i",                                     "sbas_l1.mt24.v0.dz_1",          FT_INT16,  BASE_CUSTOM, CF_FUNC(&fmt_correction_125m),  0x7fc0, NULL, HFILL}},
2298         {&hf_sbas_l1_mt24_v0_delta_a_1_f0,  {"da_i_f0",                                  "sbas_l1.mt24.v0.da_f0_1",       FT_INT16,  BASE_CUSTOM, CF_FUNC(&fmt_clock_correction), 0x3ff0, NULL, HFILL}},
2299         {&hf_sbas_l1_mt24_v0_prn_mask_nr_2, {"PRN Mask Number",                          "sbas_l1.mt24.v0.prn_mask_nr_2", FT_UINT16, BASE_DEC,    NULL,                           0x0fc0, NULL, HFILL}},
2300         {&hf_sbas_l1_mt24_v0_iod_2,         {"Issue of Data (IOD_i)",                    "sbas_l1.mt24.v0.iod_2",         FT_UINT16, BASE_DEC,    NULL,                           0x3fc0, NULL, HFILL}},
2301         {&hf_sbas_l1_mt24_v0_delta_x_2,     {"dx_i",                                     "sbas_l1.mt24.v0.dx_2",          FT_INT16,  BASE_CUSTOM, CF_FUNC(&fmt_correction_125m),  0x3fe0, NULL, HFILL}},
2302         {&hf_sbas_l1_mt24_v0_delta_y_2,     {"dy_i",                                     "sbas_l1.mt24.v0.dy_2",          FT_INT16,  BASE_CUSTOM, CF_FUNC(&fmt_correction_125m),  0x1ff0, NULL, HFILL}},
2303         {&hf_sbas_l1_mt24_v0_delta_z_2,     {"dz_i",                                     "sbas_l1.mt24.v0.dz_2",          FT_INT16,  BASE_CUSTOM, CF_FUNC(&fmt_correction_125m),  0x0ff8, NULL, HFILL}},
2304         {&hf_sbas_l1_mt24_v0_delta_a_2_f0,  {"da_i_f0",                                  "sbas_l1.mt24.v0.da_f0_2",       FT_INT16,  BASE_CUSTOM, CF_FUNC(&fmt_clock_correction), 0x07fe, NULL, HFILL}},
2305         {&hf_sbas_l1_mt24_v0_iodp,          {"Issue of Data PRN (IODP)",                 "sbas_l1.mt24.v0.iodp",          FT_UINT16, BASE_DEC,    NULL,                           0x0180,   NULL, HFILL}},
2306         {&hf_sbas_l1_mt24_v0_spare,         {"Spare",                                    "sbas_l1.mt24.v0.spare",         FT_UINT8,  BASE_DEC,    NULL,                           0x40,   NULL, HFILL}},
2307         {&hf_sbas_l1_mt24_v1_prn_mask_nr,   {"PRN Mask Number",                          "sbas_l1.mt24.v1.prn_mask_nr",   FT_UINT8,  BASE_DEC,    NULL,                           0x7e, NULL, HFILL}},
2308         {&hf_sbas_l1_mt24_v1_iod,           {"Issue of Data (IOD_i)",                    "sbas_l1.mt24.v1.iod",           FT_UINT16, BASE_DEC,    NULL,                           0x01fe, NULL, HFILL}},
2309         {&hf_sbas_l1_mt24_v1_delta_x,       {"dx_i",                                     "sbas_l1.mt24.v1.dx",            FT_INT32,  BASE_CUSTOM, CF_FUNC(&fmt_correction_125m),      0x01ffc000, NULL, HFILL}},
2310         {&hf_sbas_l1_mt24_v1_delta_y,       {"dy_i",                                     "sbas_l1.mt24.v1.dy",            FT_INT32,  BASE_CUSTOM, CF_FUNC(&fmt_correction_125m),      0x3ff80000, NULL, HFILL}},
2311         {&hf_sbas_l1_mt24_v1_delta_z,       {"dz_i",                                     "sbas_l1.mt24.v1.dz",            FT_INT32,  BASE_CUSTOM, CF_FUNC(&fmt_correction_125m),      0x07ff0000, NULL, HFILL}},
2312         {&hf_sbas_l1_mt24_v1_delta_a_f0,    {"da_i_f0",                                  "sbas_l1.mt24.v1.da_f0",         FT_INT32,  BASE_CUSTOM, CF_FUNC(&fmt_clock_correction),     0xffe00000, NULL, HFILL}},
2313         {&hf_sbas_l1_mt24_v1_delta_x_vel,   {"dx_vel_i",                                 "sbas_l1.mt24.v1.dx_vel",        FT_INT32,  BASE_CUSTOM, CF_FUNC(&fmt_velo_correction),      0x1fe00000, NULL, HFILL}},
2314         {&hf_sbas_l1_mt24_v1_delta_y_vel,   {"dy_vel_i",                                 "sbas_l1.mt24.v1.dy_vel",        FT_INT32,  BASE_CUSTOM, CF_FUNC(&fmt_velo_correction),      0x1fe00000, NULL, HFILL}},
2315         {&hf_sbas_l1_mt24_v1_delta_z_vel,   {"dz_vel_i",                                 "sbas_l1.mt24.v1.dz_vel",        FT_INT32,  BASE_CUSTOM, CF_FUNC(&fmt_velo_correction),      0x1fe00000, NULL, HFILL}},
2316         {&hf_sbas_l1_mt24_v1_delta_a_f1,    {"da_i_f1",                                  "sbas_l1.mt24.v1.da_f1",         FT_INT32,  BASE_CUSTOM, CF_FUNC(&fmt_clk_rate_correction),  0x1fe00000, NULL, HFILL}},
2317         {&hf_sbas_l1_mt24_v1_t_lt,          {"t_i_lt",                                   "sbas_l1.mt24.v1.t_lt",          FT_UINT16, BASE_CUSTOM, CF_FUNC(&fmt_time_of_applicability),0x1fff,     NULL, HFILL}},
2318         {&hf_sbas_l1_mt24_v1_iodp,          {"Issue of Data PRN (IODP)",                 "sbas_l1.mt24.v1.iodp",          FT_UINT8,  BASE_DEC,    NULL,                               0xc0,       NULL, HFILL}},
2319
2320         // MT25
2321         {&hf_sbas_l1_mt25,                       {"MT25",                     "sbas_l1.mt25",                     FT_NONE,   BASE_NONE,   NULL,                               0x0,        NULL, HFILL}},
2322         {&hf_sbas_l1_mt25_h1_velocity_code,      {"Velocity Code",            "sbas_l1.mt25.h1.velocity_code",    FT_UINT8,  BASE_DEC,    NULL,                               0x02,       NULL, HFILL}},
2323         {&hf_sbas_l1_mt25_h1_v0_prn_mask_nr_1,   {"PRN Mask Number",          "sbas_l1.mt25.h1.v0.prn_mask_nr_1", FT_UINT16, BASE_DEC,    NULL,                               0x01f8,     NULL, HFILL}},
2324         {&hf_sbas_l1_mt25_h1_v0_iod_1,           {"Issue of Data (IOD_i)",    "sbas_l1.mt25.h1.v0.iod_1",         FT_UINT16, BASE_DEC,    NULL,                               0x07f8,     NULL, HFILL}},
2325         {&hf_sbas_l1_mt25_h1_v0_delta_x_1,       {"dx_i",                     "sbas_l1.mt25.h1.v0.dx_1",          FT_INT16,  BASE_CUSTOM, CF_FUNC(&fmt_correction_125m),      0x07fc,     NULL, HFILL}},
2326         {&hf_sbas_l1_mt25_h1_v0_delta_y_1,       {"dy_i",                     "sbas_l1.mt25.h1.v0.dy_1",          FT_INT16,  BASE_CUSTOM, CF_FUNC(&fmt_correction_125m),      0x03fe,     NULL, HFILL}},
2327         {&hf_sbas_l1_mt25_h1_v0_delta_z_1,       {"dz_i",                     "sbas_l1.mt25.h1.v0.dz_1",          FT_INT16,  BASE_CUSTOM, CF_FUNC(&fmt_correction_125m),      0x01ff,     NULL, HFILL}},
2328         {&hf_sbas_l1_mt25_h1_v0_delta_a_1_f0,    {"da_i_f0",                  "sbas_l1.mt25.h1.v0.da_f0_1",       FT_INT16,  BASE_CUSTOM, CF_FUNC(&fmt_clock_correction),     0xffc0,     NULL, HFILL}},
2329         {&hf_sbas_l1_mt25_h1_v0_prn_mask_nr_2,   {"PRN Mask Number",          "sbas_l1.mt25.h1.v0.prn_mask_nr_2", FT_UINT8,  BASE_DEC,    NULL,                               0x3f,       NULL, HFILL}},
2330         {&hf_sbas_l1_mt25_h1_v0_iod_2,           {"Issue of Data (IOD_i)",    "sbas_l1.mt25.h1.v0.iod_2",         FT_UINT8,  BASE_DEC,    NULL,                               0xff,       NULL, HFILL}},
2331         {&hf_sbas_l1_mt25_h1_v0_delta_x_2,       {"dx_i",                     "sbas_l1.mt25.h1.v0.dx_2",          FT_INT16,  BASE_CUSTOM, CF_FUNC(&fmt_correction_125m),      0xff80,     NULL, HFILL}},
2332         {&hf_sbas_l1_mt25_h1_v0_delta_y_2,       {"dy_i",                     "sbas_l1.mt25.h1.v0.dy_2",          FT_INT16,  BASE_CUSTOM, CF_FUNC(&fmt_correction_125m),      0x7fc0,     NULL, HFILL}},
2333         {&hf_sbas_l1_mt25_h1_v0_delta_z_2,       {"dz_i",                     "sbas_l1.mt25.h1.v0.dz_2",          FT_INT16,  BASE_CUSTOM, CF_FUNC(&fmt_correction_125m),      0x3fe0,     NULL, HFILL}},
2334         {&hf_sbas_l1_mt25_h1_v0_delta_a_2_f0,    {"da_i_f0",                  "sbas_l1.mt25.h1.v0.da_f0_2",       FT_INT16,  BASE_CUSTOM, CF_FUNC(&fmt_clock_correction),     0x1ff8,     NULL, HFILL}},
2335         {&hf_sbas_l1_mt25_h1_v0_iodp,            {"Issue of Data - PRN (IODP)", "sbas_l1.mt25.h1.v0.iodp",          FT_UINT8,  BASE_DEC,    NULL,                               0x06,       NULL, HFILL}},
2336         {&hf_sbas_l1_mt25_h1_v0_spare,           {"Spare",                    "sbas_l1.mt25.h1.v0.spare",         FT_NONE,   BASE_NONE,   NULL,                               0x0,        NULL, HFILL}},
2337         {&hf_sbas_l1_mt25_h1_v1_prn_mask_nr,     {"PRN Mask Number",          "sbas_l1.mt25.h1.v1.prn_mask_nr_1", FT_UINT16, BASE_DEC,    NULL,                               0x01f8,     NULL, HFILL}},
2338         {&hf_sbas_l1_mt25_h1_v1_iod,             {"Issue of Data (IOD_i)",    "sbas_l1.mt25.h1.v1.iod",           FT_UINT16, BASE_DEC,    NULL,                               0x07f8,     NULL, HFILL}},
2339         {&hf_sbas_l1_mt25_h1_v1_delta_x,         {"dx_i",                     "sbas_l1.mt25.h1.v1.dx",            FT_INT32,  BASE_CUSTOM, CF_FUNC(&fmt_correction_125m),      0x07ff0000, NULL, HFILL}},
2340         {&hf_sbas_l1_mt25_h1_v1_delta_y,         {"dy_i",                     "sbas_l1.mt25.h1.v1.dy",            FT_INT32,  BASE_CUSTOM, CF_FUNC(&fmt_correction_125m),      0xffe00000, NULL, HFILL}},
2341         {&hf_sbas_l1_mt25_h1_v1_delta_z,         {"dz_i",                     "sbas_l1.mt25.h1.v1.dz",            FT_INT32,  BASE_CUSTOM, CF_FUNC(&fmt_correction_125m),      0x1ffc0000, NULL, HFILL}},
2342         {&hf_sbas_l1_mt25_h1_v1_delta_a_f0,      {"da_i_f0",                  "sbas_l1.mt25.h1.v1.da_f0",         FT_INT32,  BASE_CUSTOM, CF_FUNC(&fmt_clock_correction),     0x03ff8000, NULL, HFILL}},
2343         {&hf_sbas_l1_mt25_h1_v1_delta_x_vel,     {"dx_vel_i",                 "sbas_l1.mt25.h1.v1.dx_vel",        FT_INT32,  BASE_CUSTOM, CF_FUNC(&fmt_velo_correction),      0x7f800000, NULL, HFILL}},
2344         {&hf_sbas_l1_mt25_h1_v1_delta_y_vel,     {"dy_vel_i",                 "sbas_l1.mt25.h1.v1.dy_vel",        FT_INT32,  BASE_CUSTOM, CF_FUNC(&fmt_velo_correction),      0x7f800000, NULL, HFILL}},
2345         {&hf_sbas_l1_mt25_h1_v1_delta_z_vel,     {"dz_vel_i",                 "sbas_l1.mt25.h1.v1.dz_vel",        FT_INT32,  BASE_CUSTOM, CF_FUNC(&fmt_velo_correction),      0x7f800000, NULL, HFILL}},
2346         {&hf_sbas_l1_mt25_h1_v1_delta_a_f1,      {"da_i_f1",                  "sbas_l1.mt25.h1.v1.da_f1",         FT_INT32,  BASE_CUSTOM, CF_FUNC(&fmt_clk_rate_correction),  0x7f800000, NULL, HFILL}},
2347         {&hf_sbas_l1_mt25_h1_v1_t_lt,            {"t_i_lt",                   "sbas_l1.mt25.h1.v1.t_lt",          FT_UINT16, BASE_CUSTOM, CF_FUNC(&fmt_time_of_applicability),0x7ffc,     NULL, HFILL}},
2348         {&hf_sbas_l1_mt25_h1_v1_iodp,            {"Issue of Data - PRN (IODP)", "sbas_l1.mt25.h1.v1.iodp",          FT_UINT8,  BASE_DEC,    NULL,                               0x03,       NULL, HFILL}},
2349         {&hf_sbas_l1_mt25_h2_velocity_code,      {"Velocity Code",            "sbas_l1.mt25.h2.velocity_code",    FT_UINT8,  BASE_DEC,    NULL,                               0x80,       NULL, HFILL}},
2350         {&hf_sbas_l1_mt25_h2_v0_prn_mask_nr_1,   {"PRN Mask Number",          "sbas_l1.mt25.h2.v0.prn_mask_nr_1", FT_UINT8,  BASE_DEC,    NULL,                               0x7e,       NULL, HFILL}},
2351         {&hf_sbas_l1_mt25_h2_v0_iod_1,           {"Issue of Data (IOD_i)",    "sbas_l1.mt25.h2.v0.iod_1",         FT_UINT16, BASE_DEC,    NULL,                               0x01fe,     NULL, HFILL}},
2352         {&hf_sbas_l1_mt25_h2_v0_delta_x_1,       {"dx_i",                     "sbas_l1.mt25.h2.v0.dx_1",          FT_INT16,  BASE_CUSTOM, CF_FUNC(&fmt_correction_125m),      0x01ff,     NULL, HFILL}},
2353         {&hf_sbas_l1_mt25_h2_v0_delta_y_1,       {"dy_i",                     "sbas_l1.mt25.h2.v0.dy_1",          FT_INT16,  BASE_CUSTOM, CF_FUNC(&fmt_correction_125m),      0xff80,     NULL, HFILL}},
2354         {&hf_sbas_l1_mt25_h2_v0_delta_z_1,       {"dz_i",                     "sbas_l1.mt25.h2.v0.dz_1",          FT_INT16,  BASE_CUSTOM, CF_FUNC(&fmt_correction_125m),      0x7fc0,     NULL, HFILL}},
2355         {&hf_sbas_l1_mt25_h2_v0_delta_a_1_f0,    {"da_i_f0",                  "sbas_l1.mt25.h2.v0.da_f0_1",       FT_INT16,  BASE_CUSTOM, CF_FUNC(&fmt_clock_correction),     0x3ff0,     NULL, HFILL}},
2356         {&hf_sbas_l1_mt25_h2_v0_prn_mask_nr_2,   {"PRN Mask Number",          "sbas_l1.mt25.h2.v0.prn_mask_nr_2", FT_UINT16, BASE_DEC,    NULL,                               0x0fc0,     NULL, HFILL}},
2357         {&hf_sbas_l1_mt25_h2_v0_iod_2,           {"Issue of Data (IOD_i)",    "sbas_l1.mt25.h2.v0.iod_2",         FT_UINT16, BASE_DEC,    NULL,                               0x3fc0,     NULL, HFILL}},
2358         {&hf_sbas_l1_mt25_h2_v0_delta_x_2,       {"dx_i",                     "sbas_l1.mt25.h2.v0.dx_2",          FT_INT16,  BASE_CUSTOM, CF_FUNC(&fmt_correction_125m),      0x3fe0,     NULL, HFILL}},
2359         {&hf_sbas_l1_mt25_h2_v0_delta_y_2,       {"dy_i",                     "sbas_l1.mt25.h2.v0.dy_2",          FT_INT16,  BASE_CUSTOM, CF_FUNC(&fmt_correction_125m),      0x1ff0,     NULL, HFILL}},
2360         {&hf_sbas_l1_mt25_h2_v0_delta_z_2,       {"dz_i",                     "sbas_l1.mt25.h2.v0.dz_2",          FT_INT16,  BASE_CUSTOM, CF_FUNC(&fmt_correction_125m),      0x0ff8,     NULL, HFILL}},
2361         {&hf_sbas_l1_mt25_h2_v0_delta_a_2_f0,    {"da_i_f0",                  "sbas_l1.mt25.h2.v0.da_f0_2",       FT_INT16,  BASE_CUSTOM, CF_FUNC(&fmt_clock_correction),     0x07fe,     NULL, HFILL}},
2362         {&hf_sbas_l1_mt25_h2_v0_iodp,            {"Issue of Data PRN (IODP)", "sbas_l1.mt25.h2.v0.iodp",          FT_UINT16, BASE_DEC,    NULL,                               0x0180,     NULL, HFILL}},
2363         {&hf_sbas_l1_mt25_h2_v0_spare,           {"Spare",                    "sbas_l1.mt25.h2.v0.spare",         FT_NONE,   BASE_NONE,   NULL,                               0x0,        NULL, HFILL}},
2364         {&hf_sbas_l1_mt25_h2_v1_prn_mask_nr,     {"PRN Mask Number",          "sbas_l1.mt25.h2.v1.prn_mask_nr",   FT_UINT8,  BASE_DEC,    NULL,                               0x7e,       NULL, HFILL}},
2365         {&hf_sbas_l1_mt25_h2_v1_iod,             {"Issue of Data (IOD_i)",    "sbas_l1.mt25.h2.v1.iod",           FT_UINT16, BASE_DEC,    NULL,                               0x01fe,     NULL, HFILL}},
2366         {&hf_sbas_l1_mt25_h2_v1_delta_x,         {"dx_i",                     "sbas_l1.mt25.h2.v1.dx",            FT_INT32,  BASE_CUSTOM, CF_FUNC(&fmt_correction_125m),      0x01ffc000, NULL, HFILL}},
2367         {&hf_sbas_l1_mt25_h2_v1_delta_y,         {"dy_i",                     "sbas_l1.mt25.h2.v1.dy",            FT_INT32,  BASE_CUSTOM, CF_FUNC(&fmt_correction_125m),      0x3ff80000, NULL, HFILL}},
2368         {&hf_sbas_l1_mt25_h2_v1_delta_z,         {"dz_i",                     "sbas_l1.mt25.h2.v1.dz",            FT_INT32,  BASE_CUSTOM, CF_FUNC(&fmt_correction_125m),      0x07ff0000, NULL, HFILL}},
2369         {&hf_sbas_l1_mt25_h2_v1_delta_a_f0,      {"da_i_f0",                  "sbas_l1.mt25.h2.v1.da_f0",         FT_INT32,  BASE_CUSTOM, CF_FUNC(&fmt_clock_correction),     0xffe00000, NULL, HFILL}},
2370         {&hf_sbas_l1_mt25_h2_v1_delta_x_vel,     {"dx_vel_i",                 "sbas_l1.mt25.h2.v1.dx_vel",        FT_INT32,  BASE_CUSTOM, CF_FUNC(&fmt_velo_correction),      0x1fe00000, NULL, HFILL}},
2371         {&hf_sbas_l1_mt25_h2_v1_delta_y_vel,     {"dy_vel_i",                 "sbas_l1.mt25.h2.v1.dy_vel",        FT_INT32,  BASE_CUSTOM, CF_FUNC(&fmt_velo_correction),      0x1fe00000, NULL, HFILL}},
2372         {&hf_sbas_l1_mt25_h2_v1_delta_z_vel,     {"dz_vel_i",                 "sbas_l1.mt25.h2.v1.dz_vel",        FT_INT32,  BASE_CUSTOM, CF_FUNC(&fmt_velo_correction),      0x1fe00000, NULL, HFILL}},
2373         {&hf_sbas_l1_mt25_h2_v1_delta_a_f1,      {"da_i_f1",                  "sbas_l1.mt25.h2.v1.da_f1",         FT_INT32,  BASE_CUSTOM, CF_FUNC(&fmt_clk_rate_correction),  0x1fe00000, NULL, HFILL}},
2374         {&hf_sbas_l1_mt25_h2_v1_t_lt,            {"t_i_lt",                   "sbas_l1.mt25.h2.v1.t_lt",          FT_UINT16, BASE_CUSTOM, CF_FUNC(&fmt_time_of_applicability),0x1fff,     NULL, HFILL}},
2375         {&hf_sbas_l1_mt25_h2_v1_iodp,            {"Issue of Data PRN (IODP)", "sbas_l1.mt25.h2.v1.iodp",          FT_UINT8,  BASE_DEC,    NULL,                               0xc0,       NULL, HFILL}},
2376
2377         // MT26
2378         {&hf_sbas_l1_mt26,                           {"MT26",                          "sbas_l1.mt26",                                     FT_NONE,   BASE_NONE,   NULL,                          0x0,    NULL, HFILL}},
2379         {&hf_sbas_l1_mt26_igp_band_id,               {"IGP Band Identifier",           "sbas_l1.mt26.igp_band_id",                         FT_UINT16, BASE_DEC,    NULL,                          0x03c0, NULL, HFILL}},
2380         {&hf_sbas_l1_mt26_igp_block_id,              {"IGP Block Identifier",          "sbas_l1.mt26.igp_block_id",                        FT_UINT16, BASE_DEC,    NULL,                          0x3c,   NULL, HFILL}},
2381         {&hf_sbas_l1_mt26_igp_vertical_delay_est_1,  {"IGP Vertical Delay Estimate 1", "sbas_l1.mt26.igp_vertical_delay_est_1",            FT_UINT16, BASE_CUSTOM, CF_FUNC(&fmt_correction_125m), 0x03fe, NULL, HFILL}},
2382         {&hf_sbas_l1_mt26_givei_1,                   {"Grid Ionospheric Vertical Error Indicator 1 (GIVEI_1)", "sbas_l1.mt26.givei_1",     FT_UINT16, BASE_DEC,    VALS(GIVEI_EVALUATION),        0x01e0, NULL, HFILL}},
2383         {&hf_sbas_l1_mt26_igp_vertical_delay_est_2,  {"IGP Vertical Delay Estimate 2", "sbas_l1.mt26.igp_vertical_delay_est_2",            FT_UINT16, BASE_CUSTOM, CF_FUNC(&fmt_correction_125m), 0x1ff0, NULL, HFILL}},
2384         {&hf_sbas_l1_mt26_givei_2,                   {"Grid Ionospheric Vertical Error Indicator 2 (GIVEI_2)", "sbas_l1.mt26.givei_2",     FT_UINT16, BASE_DEC,    VALS(GIVEI_EVALUATION),        0x0f00, NULL, HFILL}},
2385         {&hf_sbas_l1_mt26_igp_vertical_delay_est_3,  {"IGP Vertical Delay Estimate 3", "sbas_l1.mt26.igp_vertical_delay_est_3",            FT_UINT16, BASE_CUSTOM, CF_FUNC(&fmt_correction_125m), 0xff80, NULL, HFILL}},
2386         {&hf_sbas_l1_mt26_givei_3,                   {"Grid Ionospheric Vertical Error Indicator 3 (GIVEI_3)", "sbas_l1.mt26.givei_3",     FT_UINT16, BASE_DEC,    VALS(GIVEI_EVALUATION),        0x7800, NULL, HFILL}},
2387         {&hf_sbas_l1_mt26_igp_vertical_delay_est_4,  {"IGP Vertical Delay Estimate 4", "sbas_l1.mt26.igp_vertical_delay_est_4",            FT_UINT16, BASE_CUSTOM, CF_FUNC(&fmt_correction_125m), 0x07fc, NULL, HFILL}},
2388         {&hf_sbas_l1_mt26_givei_4,                   {"Grid Ionospheric Vertical Error Indicator 4 (GIVEI_4)", "sbas_l1.mt26.givei_4",     FT_UINT16, BASE_DEC,    VALS(GIVEI_EVALUATION),        0x03c0, NULL, HFILL}},
2389         {&hf_sbas_l1_mt26_igp_vertical_delay_est_5,  {"IGP Vertical Delay Estimate 5", "sbas_l1.mt26.igp_vertical_delay_est_5",            FT_UINT16, BASE_CUSTOM, CF_FUNC(&fmt_correction_125m), 0x3fe0, NULL, HFILL}},
2390         {&hf_sbas_l1_mt26_givei_5,                   {"Grid Ionospheric Vertical Error Indicator 5 (GIVEI_5)", "sbas_l1.mt26.givei_5",     FT_UINT16, BASE_DEC,    VALS(GIVEI_EVALUATION),        0x1e00, NULL, HFILL}},
2391         {&hf_sbas_l1_mt26_igp_vertical_delay_est_6,  {"IGP Vertical Delay Estimate 6", "sbas_l1.mt26.igp_vertical_delay_est_6",            FT_UINT16, BASE_CUSTOM, CF_FUNC(&fmt_correction_125m), 0x01ff, NULL, HFILL}},
2392         {&hf_sbas_l1_mt26_givei_6,                   {"Grid Ionospheric Vertical Error Indicator 6 (GIVEI_6)", "sbas_l1.mt26.givei_6",     FT_UINT16, BASE_DEC,    VALS(GIVEI_EVALUATION),        0xf000, NULL, HFILL}},
2393         {&hf_sbas_l1_mt26_igp_vertical_delay_est_7,  {"IGP Vertical Delay Estimate 7", "sbas_l1.mt26.igp_vertical_delay_est_7",            FT_UINT16, BASE_CUSTOM, CF_FUNC(&fmt_correction_125m), 0x0ff8, NULL, HFILL}},
2394         {&hf_sbas_l1_mt26_givei_7,                   {"Grid Ionospheric Vertical Error Indicator 7 (GIVEI_7)", "sbas_l1.mt26.givei_7",     FT_UINT16, BASE_DEC,    VALS(GIVEI_EVALUATION),        0x0780, NULL, HFILL}},
2395         {&hf_sbas_l1_mt26_igp_vertical_delay_est_8,  {"IGP Vertical Delay Estimate 8", "sbas_l1.mt26.igp_vertical_delay_est_8",            FT_UINT16, BASE_CUSTOM, CF_FUNC(&fmt_correction_125m), 0x7fc0, NULL, HFILL}},
2396         {&hf_sbas_l1_mt26_givei_8,                   {"Grid Ionospheric Vertical Error Indicator 8 (GIVEI_8)", "sbas_l1.mt26.givei_8",     FT_UINT16, BASE_DEC,    VALS(GIVEI_EVALUATION),        0x3c00, NULL, HFILL}},
2397         {&hf_sbas_l1_mt26_igp_vertical_delay_est_9,  {"IGP Vertical Delay Estimate 9", "sbas_l1.mt26.igp_vertical_delay_est_9",            FT_UINT16, BASE_CUSTOM, CF_FUNC(&fmt_correction_125m), 0x03fe, NULL, HFILL}},
2398         {&hf_sbas_l1_mt26_givei_9,                   {"Grid Ionospheric Vertical Error Indicator 9 (GIVEI_9)", "sbas_l1.mt26.givei_9",     FT_UINT16, BASE_DEC,    VALS(GIVEI_EVALUATION),        0x01e0, NULL, HFILL}},
2399         {&hf_sbas_l1_mt26_igp_vertical_delay_est_10,  {"IGP Vertical Delay Estimate 10", "sbas_l1.mt26.igp_vertical_delay_est_10",         FT_UINT16, BASE_CUSTOM, CF_FUNC(&fmt_correction_125m), 0x1ff0, NULL, HFILL}},
2400         {&hf_sbas_l1_mt26_givei_10,                   {"Grid Ionospheric Vertical Error Indicator 10 (GIVEI_10)", "sbas_l1.mt26.givei_10", FT_UINT16, BASE_DEC,    VALS(GIVEI_EVALUATION),        0x0f00, NULL, HFILL}},
2401         {&hf_sbas_l1_mt26_igp_vertical_delay_est_11,  {"IGP Vertical Delay Estimate 11", "sbas_l1.mt26.igp_vertical_delay_est_11",         FT_UINT16, BASE_CUSTOM, CF_FUNC(&fmt_correction_125m), 0xff80, NULL, HFILL}},
2402         {&hf_sbas_l1_mt26_givei_11,                   {"Grid Ionospheric Vertical Error Indicator 11 (GIVEI_11)", "sbas_l1.mt26.givei_11", FT_UINT16, BASE_DEC,    VALS(GIVEI_EVALUATION),        0x7800, NULL, HFILL}},
2403         {&hf_sbas_l1_mt26_igp_vertical_delay_est_12,  {"IGP Vertical Delay Estimate 12", "sbas_l1.mt26.igp_vertical_delay_est_12",         FT_UINT16, BASE_CUSTOM, CF_FUNC(&fmt_correction_125m), 0x07fc, NULL, HFILL}},
2404         {&hf_sbas_l1_mt26_givei_12,                   {"Grid Ionospheric Vertical Error Indicator 12 (GIVEI_12)", "sbas_l1.mt26.givei_12", FT_UINT16, BASE_DEC,    VALS(GIVEI_EVALUATION),        0x03c0, NULL, HFILL}},
2405         {&hf_sbas_l1_mt26_igp_vertical_delay_est_13,  {"IGP Vertical Delay Estimate 13", "sbas_l1.mt26.igp_vertical_delay_est_13",         FT_UINT16, BASE_CUSTOM, CF_FUNC(&fmt_correction_125m), 0x3fe0, NULL, HFILL}},
2406         {&hf_sbas_l1_mt26_givei_13,                   {"Grid Ionospheric Vertical Error Indicator 13 (GIVEI_13)", "sbas_l1.mt26.givei_13", FT_UINT16, BASE_DEC,    VALS(GIVEI_EVALUATION),        0x1e00, NULL, HFILL}},
2407         {&hf_sbas_l1_mt26_igp_vertical_delay_est_14,  {"IGP Vertical Delay Estimate 14", "sbas_l1.mt26.igp_vertical_delay_est_14",         FT_UINT16, BASE_CUSTOM, CF_FUNC(&fmt_correction_125m), 0x01ff, NULL, HFILL}},
2408         {&hf_sbas_l1_mt26_givei_14,                   {"Grid Ionospheric Vertical Error Indicator 14 (GIVEI_14)", "sbas_l1.mt26.givei_14", FT_UINT16, BASE_DEC,    VALS(GIVEI_EVALUATION),        0xf000, NULL, HFILL}},
2409         {&hf_sbas_l1_mt26_igp_vertical_delay_est_15,  {"IGP Vertical Delay Estimate 15", "sbas_l1.mt26.igp_vertical_delay_est_15",         FT_UINT16, BASE_CUSTOM, CF_FUNC(&fmt_correction_125m), 0x0ff8, NULL, HFILL}},
2410         {&hf_sbas_l1_mt26_givei_15,                   {"Grid Ionospheric Vertical Error Indicator 15 (GIVEI_15)", "sbas_l1.mt26.givei_15", FT_UINT16, BASE_DEC,    VALS(GIVEI_EVALUATION),        0x0780, NULL, HFILL}},
2411         {&hf_sbas_l1_mt26_iodi_k,                     {"Issue of Data - IGP (IODI_k)", "sbas_l1.mt26.iodi_k",                              FT_UINT8,  BASE_DEC,    NULL,                          0x60,   NULL, HFILL}},
2412         {&hf_sbas_l1_mt26_spare,                      {"Spare", "sbas_l1.mt26.spare",                                                      FT_UINT16, BASE_DEC,    NULL,                          0x1fc0, NULL, HFILL}},
2413
2414         // MT27
2415         {&hf_sbas_l1_mt27,                  {"MT27",                              "sbas_l1.mt27",              FT_NONE,   BASE_NONE,                  NULL,                       0x0,                NULL, HFILL}},
2416         {&hf_sbas_l1_mt27_iods,             {"Issue of Data, service (IODS)",     "sbas_l1.mt27.iods",         FT_UINT16, BASE_DEC,                   NULL,                       0x0380,             NULL, HFILL}},
2417         {&hf_sbas_l1_mt27_num_svc_msgs,     {"Number of Service Messages",        "sbas_l1.mt27.num_svc_msgs", FT_UINT16, BASE_CUSTOM,                CF_FUNC(&fmt_num_svc_msg),  0x7000,             NULL, HFILL}},
2418         {&hf_sbas_l1_mt27_svc_msg_num,      {"Service Message Number",            "sbas_l1.mt27.svc_msg_num",  FT_UINT16, BASE_CUSTOM,                CF_FUNC(&fmt_num_svc_msg),  0x0e00,             NULL, HFILL}},
2419         {&hf_sbas_l1_mt27_num_regions,      {"Number of Regions",                 "sbas_l1.mt27.num_regions",  FT_UINT16, BASE_DEC,                   NULL,                       0x01c0,             NULL, HFILL}},
2420         {&hf_sbas_l1_mt27_prio_code,        {"Priority Code",                     "sbas_l1.mt27.prio_code",    FT_UINT16, BASE_DEC,                   NULL,                       0x0030,             NULL, HFILL}},
2421         {&hf_sbas_l1_mt27_dudre_in,         {UTF8_DELTA "UDRE indicator-inside",  "sbas_l1.mt27.dudre_in",     FT_UINT16, BASE_DEC,                   VALS(DELTA_UDRE_INDICATOR), 0x000f,             NULL, HFILL}},
2422         {&hf_sbas_l1_mt27_dudre_out,        {UTF8_DELTA "UDRE indicator-outside", "sbas_l1.mt27.dudre_out",    FT_UINT16, BASE_DEC,                   VALS(DELTA_UDRE_INDICATOR), 0xf000,             NULL, HFILL}},
2423         {&hf_sbas_l1_mt27_region[0],        {"Region 1",                          "sbas_l1.mt27.r1",           FT_UINT64, BASE_HEX,                   NULL,                       0x0000000000000000, NULL, HFILL}},
2424         {&hf_sbas_l1_mt27_region_c1_lat[0], {"Coordinate 1 Latitude",             "sbas_l1.mt27.r1.c1.lat",    FT_INT64,  BASE_DEC|BASE_UNIT_STRING,  UNS(&units_degree_bearing), 0x0ff0000000000000, NULL, HFILL}},
2425         {&hf_sbas_l1_mt27_region_c1_lon[0], {"Coordinate 1 Longitude",            "sbas_l1.mt27.r1.c1.lon",    FT_INT64,  BASE_DEC|BASE_UNIT_STRING,  UNS(&units_degree_bearing), 0x000ff80000000000, NULL, HFILL}},
2426         {&hf_sbas_l1_mt27_region_c2_lat[0], {"Coordinate 2 Latitude",             "sbas_l1.mt27.r1.c2.lat",    FT_INT64,  BASE_DEC|BASE_UNIT_STRING,  UNS(&units_degree_bearing), 0x000007f800000000, NULL, HFILL}},
2427         {&hf_sbas_l1_mt27_region_c2_lon[0], {"Coordinate 2 Longitude",            "sbas_l1.mt27.r1.c2.lon",    FT_INT64,  BASE_DEC|BASE_UNIT_STRING,  UNS(&units_degree_bearing), 0x00000007fc000000, NULL, HFILL}},
2428         {&hf_sbas_l1_mt27_region_shape[0],  {"Region Shape",                      "sbas_l1.mt27.r1.shape",     FT_UINT64, BASE_DEC|BASE_VAL64_STRING, VALS64(REGION_SHAPE),       0x0000000002000000, NULL, HFILL}},
2429         {&hf_sbas_l1_mt27_region[1],        {"Region 2",                          "sbas_l1.mt27.r2",           FT_UINT64, BASE_HEX,    NULL,                       0x0000000000000000, NULL, HFILL}},
2430         {&hf_sbas_l1_mt27_region_c1_lat[1], {"Coordinate 1 Latitude",             "sbas_l1.mt27.r2.c1.lat",    FT_INT64,  BASE_DEC|BASE_UNIT_STRING,  UNS(&units_degree_bearing), 0x01fe000000000000, NULL, HFILL}},
2431         {&hf_sbas_l1_mt27_region_c1_lon[1], {"Coordinate 1 Longitude",            "sbas_l1.mt27.r2.c1.lon",    FT_INT64,  BASE_DEC|BASE_UNIT_STRING,  UNS(&units_degree_bearing), 0x0001ff0000000000, NULL, HFILL}},
2432         {&hf_sbas_l1_mt27_region_c2_lat[1], {"Coordinate 2 Latitude",             "sbas_l1.mt27.r2.c2.lat",    FT_INT64,  BASE_DEC|BASE_UNIT_STRING,  UNS(&units_degree_bearing), 0x000000ff00000000, NULL, HFILL}},
2433         {&hf_sbas_l1_mt27_region_c2_lon[1], {"Coordinate 2 Longitude",            "sbas_l1.mt27.r2.c2.lon",    FT_INT64,  BASE_DEC|BASE_UNIT_STRING,  UNS(&units_degree_bearing), 0x00000000ff800000, NULL, HFILL}},
2434         {&hf_sbas_l1_mt27_region_shape[1],  {"Region Shape",                      "sbas_l1.mt27.r2.shape",     FT_UINT64, BASE_DEC|BASE_VAL64_STRING, VALS64(REGION_SHAPE),       0x0000000000400000, NULL, HFILL}},
2435         {&hf_sbas_l1_mt27_region[2],        {"Region 3",                          "sbas_l1.mt27.r3",           FT_UINT64, BASE_HEX,    NULL,                       0x0000000000000000, NULL, HFILL}},
2436         {&hf_sbas_l1_mt27_region_c1_lat[2], {"Coordinate 1 Latitude",             "sbas_l1.mt27.r3.c1.lat",    FT_INT64,  BASE_DEC|BASE_UNIT_STRING,  UNS(&units_degree_bearing), 0x3fc0000000000000, NULL, HFILL}},
2437         {&hf_sbas_l1_mt27_region_c1_lon[2], {"Coordinate 1 Longitude",            "sbas_l1.mt27.r3.c1.lon",    FT_INT64,  BASE_DEC|BASE_UNIT_STRING,  UNS(&units_degree_bearing), 0x003fe00000000000, NULL, HFILL}},
2438         {&hf_sbas_l1_mt27_region_c2_lat[2], {"Coordinate 2 Latitude",             "sbas_l1.mt27.r3.c2.lat",    FT_INT64,  BASE_DEC|BASE_UNIT_STRING,  UNS(&units_degree_bearing), 0x00001fe000000000, NULL, HFILL}},
2439         {&hf_sbas_l1_mt27_region_c2_lon[2], {"Coordinate 2 Longitude",            "sbas_l1.mt27.r3.c2.lon",    FT_INT64,  BASE_DEC|BASE_UNIT_STRING,  UNS(&units_degree_bearing), 0x0000001ff0000000, NULL, HFILL}},
2440         {&hf_sbas_l1_mt27_region_shape[2],  {"Region Shape",                      "sbas_l1.mt27.r3.shape",     FT_UINT64, BASE_DEC|BASE_VAL64_STRING, VALS64(REGION_SHAPE),       0x0000000008000000, NULL, HFILL}},
2441         {&hf_sbas_l1_mt27_region[3],        {"Region 4",                          "sbas_l1.mt27.r4",           FT_UINT64, BASE_HEX,    NULL,                       0x0000000000000000, NULL, HFILL}},
2442         {&hf_sbas_l1_mt27_region_c1_lat[3], {"Coordinate 1 Latitude",             "sbas_l1.mt27.r4.c1.lat",    FT_INT64,  BASE_DEC|BASE_UNIT_STRING,  UNS(&units_degree_bearing), 0x07f8000000000000, NULL, HFILL}},
2443         {&hf_sbas_l1_mt27_region_c1_lon[3], {"Coordinate 1 Longitude",            "sbas_l1.mt27.r4.c1.lon",    FT_INT64,  BASE_DEC|BASE_UNIT_STRING,  UNS(&units_degree_bearing), 0x0007fc0000000000, NULL, HFILL}},
2444         {&hf_sbas_l1_mt27_region_c2_lat[3], {"Coordinate 2 Latitude",             "sbas_l1.mt27.r4.c2.lat",    FT_INT64,  BASE_DEC|BASE_UNIT_STRING,  UNS(&units_degree_bearing), 0x000003fc00000000, NULL, HFILL}},
2445         {&hf_sbas_l1_mt27_region_c2_lon[3], {"Coordinate 2 Longitude",            "sbas_l1.mt27.r4.c2.lon",    FT_INT64,  BASE_DEC|BASE_UNIT_STRING,  UNS(&units_degree_bearing), 0x00000003fe000000, NULL, HFILL}},
2446         {&hf_sbas_l1_mt27_region_shape[3],  {"Region Shape",                      "sbas_l1.mt27.r4.shape",     FT_UINT64, BASE_DEC|BASE_VAL64_STRING, VALS64(REGION_SHAPE),       0x0000000001000000, NULL, HFILL}},
2447         {&hf_sbas_l1_mt27_region[4],        {"Region 5",                          "sbas_l1.mt27.r5",           FT_UINT64, BASE_HEX,    NULL,                       0x0000000000000000, NULL, HFILL}},
2448         {&hf_sbas_l1_mt27_region_c1_lat[4], {"Coordinate 1 Latitude",             "sbas_l1.mt27.r5.c1.lat",    FT_INT64,  BASE_DEC|BASE_UNIT_STRING,  UNS(&units_degree_bearing), 0x00ff000000000000, NULL, HFILL}},
2449         {&hf_sbas_l1_mt27_region_c1_lon[4], {"Coordinate 1 Longitude",            "sbas_l1.mt27.r5.c1.lon",    FT_INT64,  BASE_DEC|BASE_UNIT_STRING,  UNS(&units_degree_bearing), 0x0000ff8000000000, NULL, HFILL}},
2450         {&hf_sbas_l1_mt27_region_c2_lat[4], {"Coordinate 2 Latitude",             "sbas_l1.mt27.r5.c2.lat",    FT_INT64,  BASE_DEC|BASE_UNIT_STRING,  UNS(&units_degree_bearing), 0x0000007f80000000, NULL, HFILL}},
2451         {&hf_sbas_l1_mt27_region_c2_lon[4], {"Coordinate 2 Longitude",            "sbas_l1.mt27.r5.c2.lon",    FT_INT64,  BASE_DEC|BASE_UNIT_STRING,  UNS(&units_degree_bearing), 0x000000007fc00000, NULL, HFILL}},
2452         {&hf_sbas_l1_mt27_region_shape[4],  {"Region Shape",                      "sbas_l1.mt27.r5.shape",     FT_UINT64, BASE_DEC|BASE_VAL64_STRING, VALS64(REGION_SHAPE),       0x0000000000200000, NULL, HFILL}},
2453         {&hf_sbas_l1_mt27_spare,            {"Spare",                             "sbas_l1.mt27.spare",        FT_UINT32, BASE_HEX,                   NULL,                       0x001fffc0,         NULL, HFILL}},
2454
2455         // MT63
2456         {&hf_sbas_l1_mt63,         {"MT63",    "sbas_l1.mt63",         FT_NONE,  BASE_NONE, NULL, 0x00, NULL, HFILL}},
2457         {&hf_sbas_l1_mt63_spare_1, {"Spare 1", "sbas_l1.mt63.spare_1", FT_UINT8, BASE_HEX,  NULL, 0x03, NULL, HFILL}},
2458         {&hf_sbas_l1_mt63_spare_2, {"Spare 2", "sbas_l1.mt63.spare_2", FT_BYTES, SEP_SPACE, NULL, 0x00, NULL, HFILL}},
2459         {&hf_sbas_l1_mt63_spare_3, {"Spare 3", "sbas_l1.mt63.spare_3", FT_UINT8, BASE_HEX,  NULL, 0xc0, NULL, HFILL}},
2460     };
2461
2462     expert_module_t *expert_sbas_l1;
2463
2464     static ei_register_info ei[] = {
2465         {&ei_sbas_l1_preamble,          {"sbas_l1.illegal_preamble",          PI_PROTOCOL, PI_WARN, "Illegal preamble", EXPFILL}},
2466         {&ei_sbas_l1_mt0,               {"sbas_l1.mt0",                       PI_PROTOCOL, PI_WARN, "MT is 0", EXPFILL}},
2467         {&ei_sbas_l1_crc,               {"sbas_l1.crc",                       PI_CHECKSUM, PI_WARN, "CRC", EXPFILL}},
2468         {&ei_sbas_l1_mt26_igp_band_id,  {"sbas_l1.mt26.illegal_igp_band_id",  PI_PROTOCOL, PI_WARN, "Illegal IGP Band Identifier", EXPFILL}},
2469         {&ei_sbas_l1_mt26_igp_block_id, {"sbas_l1.mt26.illegal_igp_block_id", PI_PROTOCOL, PI_WARN, "Illegal IGP Block Identifier", EXPFILL}},
2470     };
2471
2472     static int *ett[] = {
2473         &ett_sbas_l1,
2474         &ett_sbas_l1_mt0,
2475         &ett_sbas_l1_mt1,
2476         &ett_sbas_l1_mt2,
2477         &ett_sbas_l1_mt3,
2478         &ett_sbas_l1_mt4,
2479         &ett_sbas_l1_mt5,
2480         &ett_sbas_l1_mt6,
2481         &ett_sbas_l1_mt7,
2482         &ett_sbas_l1_mt9,
2483         &ett_sbas_l1_mt17,
2484         &ett_sbas_l1_mt17_prn_data[0],
2485         &ett_sbas_l1_mt17_prn_data[1],
2486         &ett_sbas_l1_mt17_prn_data[2],
2487         &ett_sbas_l1_mt17_health_and_status,
2488         &ett_sbas_l1_mt18,
2489         &ett_sbas_l1_mt24,
2490         &ett_sbas_l1_mt25,
2491         &ett_sbas_l1_mt26,
2492         &ett_sbas_l1_mt27,
2493         &ett_sbas_l1_mt27_region[0],
2494         &ett_sbas_l1_mt27_region[1],
2495         &ett_sbas_l1_mt27_region[2],
2496         &ett_sbas_l1_mt27_region[3],
2497         &ett_sbas_l1_mt27_region[4],
2498         &ett_sbas_l1_mt63,
2499     };
2500
2501     proto_sbas_l1 = proto_register_protocol("SBAS L1 Navigation Message", "SBAS L1", "sbas_l1");
2502
2503     proto_register_field_array(proto_sbas_l1, hf, array_length(hf));
2504     proto_register_subtree_array(ett, array_length(ett));
2505
2506     expert_sbas_l1 = expert_register_protocol(proto_sbas_l1);
2507     expert_register_field_array(expert_sbas_l1, ei, array_length(ei));
2508
2509     register_dissector("sbas_l1", dissect_sbas_l1, proto_sbas_l1);
2510
2511     sbas_l1_mt_dissector_table = register_dissector_table("sbas_l1.mt",
2512             "SBAS L1 MT", proto_sbas_l1, FT_UINT8, BASE_DEC);
2513 }
2514
2515
2516 void proto_reg_handoff_sbas_l1(void) {
2517     dissector_add_uint("ubx.rxm.sfrbx.gnssid", GNSS_ID_SBAS,
2518         create_dissector_handle(dissect_sbas_l1, proto_sbas_l1));
2519
2520     dissector_add_uint("sbas_l1.mt", 0,  create_dissector_handle(dissect_sbas_l1_mt0,  proto_sbas_l1));
2521     dissector_add_uint("sbas_l1.mt", 1,  create_dissector_handle(dissect_sbas_l1_mt1,  proto_sbas_l1));
2522     dissector_add_uint("sbas_l1.mt", 2,  create_dissector_handle(dissect_sbas_l1_mt2,  proto_sbas_l1));
2523     dissector_add_uint("sbas_l1.mt", 3,  create_dissector_handle(dissect_sbas_l1_mt3,  proto_sbas_l1));
2524     dissector_add_uint("sbas_l1.mt", 4,  create_dissector_handle(dissect_sbas_l1_mt4,  proto_sbas_l1));
2525     dissector_add_uint("sbas_l1.mt", 5,  create_dissector_handle(dissect_sbas_l1_mt5,  proto_sbas_l1));
2526     dissector_add_uint("sbas_l1.mt", 6,  create_dissector_handle(dissect_sbas_l1_mt6,  proto_sbas_l1));
2527     dissector_add_uint("sbas_l1.mt", 7,  create_dissector_handle(dissect_sbas_l1_mt7,  proto_sbas_l1));
2528     dissector_add_uint("sbas_l1.mt", 9,  create_dissector_handle(dissect_sbas_l1_mt9,  proto_sbas_l1));
2529     dissector_add_uint("sbas_l1.mt", 17, create_dissector_handle(dissect_sbas_l1_mt17, proto_sbas_l1));
2530     dissector_add_uint("sbas_l1.mt", 18, create_dissector_handle(dissect_sbas_l1_mt18, proto_sbas_l1));
2531     dissector_add_uint("sbas_l1.mt", 24, create_dissector_handle(dissect_sbas_l1_mt24, proto_sbas_l1));
2532     dissector_add_uint("sbas_l1.mt", 25, create_dissector_handle(dissect_sbas_l1_mt25, proto_sbas_l1));
2533     dissector_add_uint("sbas_l1.mt", 26, create_dissector_handle(dissect_sbas_l1_mt26, proto_sbas_l1));
2534     dissector_add_uint("sbas_l1.mt", 27, create_dissector_handle(dissect_sbas_l1_mt27, proto_sbas_l1));
2535     dissector_add_uint("sbas_l1.mt", 63, create_dissector_handle(dissect_sbas_l1_mt63, proto_sbas_l1));
2536 }