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 // SBAS service provider identifier mapping
  39 // see ICAO Annex 10, Vol I, Table B-27
  40 static const value_string SBAS_SPID[] = {
  41     {0, "WAAS"},
  42     {1, "EGNOS"},
  43     {2, "MSAS"},
  44     {0, NULL}
  45 };
  46
  47 // UDREI_i mapping
  48 // see ICAO Annex 10, Vol I, Table B-29
  49 const value_string UDREI_EVALUATION[] = {
  50     {0,  "0.0520 m" UTF8_SUPERSCRIPT_TWO},
  51     {1,  "0.0924 m" UTF8_SUPERSCRIPT_TWO},
  52     {2,  "0.1444 m" UTF8_SUPERSCRIPT_TWO},
  53     {3,  "0.2830 m" UTF8_SUPERSCRIPT_TWO},
  54     {4,  "0.4678 m" UTF8_SUPERSCRIPT_TWO},
  55     {5,  "0.8315 m" UTF8_SUPERSCRIPT_TWO},
  56     {6,  "1.2992 m" UTF8_SUPERSCRIPT_TWO},
  57     {7,  "1.8709 m" UTF8_SUPERSCRIPT_TWO},
  58     {8,  "2.5465 m" UTF8_SUPERSCRIPT_TWO},
  59     {9,  "3.3260 m" UTF8_SUPERSCRIPT_TWO},
  60     {10, "5.1968 m" UTF8_SUPERSCRIPT_TWO},
  61     {11, "20.7870 m" UTF8_SUPERSCRIPT_TWO},
  62     {12, "230.9661 m" UTF8_SUPERSCRIPT_TWO},
  63     {13, "2078.695 m" UTF8_SUPERSCRIPT_TWO},
  64     {14, "Not Monitored"},
  65     {15, "Do Not Use"},
  66     {0,  NULL}
  67 };
  68
  69 // GIVEI_i mapping
  70 // see ICAO Annex 10, Vol I, Table B-33
  71 static const value_string GIVEI_EVALUATION[] = {
  72     {0,  "0.0084 m" UTF8_SUPERSCRIPT_TWO},
  73     {1,  "0.0333 m" UTF8_SUPERSCRIPT_TWO},
  74     {2,  "0.0749 m" UTF8_SUPERSCRIPT_TWO},
  75     {3,  "0.1331 m" UTF8_SUPERSCRIPT_TWO},
  76     {4,  "0.2079 m" UTF8_SUPERSCRIPT_TWO},
  77     {5,  "0.2994 m" UTF8_SUPERSCRIPT_TWO},
  78     {6,  "0.4075 m" UTF8_SUPERSCRIPT_TWO},
  79     {7,  "0.5322 m" UTF8_SUPERSCRIPT_TWO},
  80     {8,  "0.6735 m" UTF8_SUPERSCRIPT_TWO},
  81     {9,  "0.8315 m" UTF8_SUPERSCRIPT_TWO},
  82     {10, "1.1974 m" UTF8_SUPERSCRIPT_TWO},
  83     {11, "1.8709 m" UTF8_SUPERSCRIPT_TWO},
  84     {12, "3.3260 m" UTF8_SUPERSCRIPT_TWO},
  85     {13, "20.787 m" UTF8_SUPERSCRIPT_TWO},
  86     {14, "187.0826 m" UTF8_SUPERSCRIPT_TWO},
  87     {15, "Not Monitored"},
  88     {0,  NULL}
  89 };
  90
  91 // Mapping for fast correction degradation factor
  92 // see ICAO Annex 10, Vol I, Table B-34
  93 static const value_string DEGRADATION_FACTOR_INDICATOR[] = {
  94     {0,  "0.0 mm/s" UTF8_SUPERSCRIPT_TWO},
  95     {1,  "0.05 mm/s" UTF8_SUPERSCRIPT_TWO},
  96     {2,  "0.09 mm/s" UTF8_SUPERSCRIPT_TWO},
  97     {3,  "0.12 mm/s" UTF8_SUPERSCRIPT_TWO},
  98     {4,  "0.15 mm/s" UTF8_SUPERSCRIPT_TWO},
  99     {5,  "0.20 mm/s" UTF8_SUPERSCRIPT_TWO},
 100     {6,  "0.30 mm/s" UTF8_SUPERSCRIPT_TWO},
 101     {7,  "0.45 mm/s" UTF8_SUPERSCRIPT_TWO},
 102     {8,  "0.60 mm/s" UTF8_SUPERSCRIPT_TWO},
 103     {9,  "0.90 mm/s" UTF8_SUPERSCRIPT_TWO},
 104     {10, "1.50 mm/s" UTF8_SUPERSCRIPT_TWO},
 105     {11, "2.10 mm/s" UTF8_SUPERSCRIPT_TWO},
 106     {12, "2.70 mm/s" UTF8_SUPERSCRIPT_TWO},
 107     {13, "3.30 mm/s" UTF8_SUPERSCRIPT_TWO},
 108     {14, "4.60 mm/s" UTF8_SUPERSCRIPT_TWO},
 109     {15, "5.80 mm/s" UTF8_SUPERSCRIPT_TWO},
 110     {0,  NULL}
 111 };
 112
 113 // table for SBAS L1 CRC24Q computation
 114 static const uint32_t CRC24Q_TBL[] = {
 115     0x000000, 0x864CFB, 0x8AD50D, 0x0C99F6, 0x93E6E1, 0x15AA1A, 0x1933EC, 0x9F7F17,
 116     0xA18139, 0x27CDC2, 0x2B5434, 0xAD18CF, 0x3267D8, 0xB42B23, 0xB8B2D5, 0x3EFE2E,
 117     0xC54E89, 0x430272, 0x4F9B84, 0xC9D77F, 0x56A868, 0xD0E493, 0xDC7D65, 0x5A319E,
 118     0x64CFB0, 0xE2834B, 0xEE1ABD, 0x685646, 0xF72951, 0x7165AA, 0x7DFC5C, 0xFBB0A7,
 119     0x0CD1E9, 0x8A9D12, 0x8604E4, 0x00481F, 0x9F3708, 0x197BF3, 0x15E205, 0x93AEFE,
 120     0xAD50D0, 0x2B1C2B, 0x2785DD, 0xA1C926, 0x3EB631, 0xB8FACA, 0xB4633C, 0x322FC7,
 121     0xC99F60, 0x4FD39B, 0x434A6D, 0xC50696, 0x5A7981, 0xDC357A, 0xD0AC8C, 0x56E077,
 122     0x681E59, 0xEE52A2, 0xE2CB54, 0x6487AF, 0xFBF8B8, 0x7DB443, 0x712DB5, 0xF7614E,
 123     0x19A3D2, 0x9FEF29, 0x9376DF, 0x153A24, 0x8A4533, 0x0C09C8, 0x00903E, 0x86DCC5,
 124     0xB822EB, 0x3E6E10, 0x32F7E6, 0xB4BB1D, 0x2BC40A, 0xAD88F1, 0xA11107, 0x275DFC,
 125     0xDCED5B, 0x5AA1A0, 0x563856, 0xD074AD, 0x4F0BBA, 0xC94741, 0xC5DEB7, 0x43924C,
 126     0x7D6C62, 0xFB2099, 0xF7B96F, 0x71F594, 0xEE8A83, 0x68C678, 0x645F8E, 0xE21375,
 127     0x15723B, 0x933EC0, 0x9FA736, 0x19EBCD, 0x8694DA, 0x00D821, 0x0C41D7, 0x8A0D2C,
 128     0xB4F302, 0x32BFF9, 0x3E260F, 0xB86AF4, 0x2715E3, 0xA15918, 0xADC0EE, 0x2B8C15,
 129     0xD03CB2, 0x567049, 0x5AE9BF, 0xDCA544, 0x43DA53, 0xC596A8, 0xC90F5E, 0x4F43A5,
 130     0x71BD8B, 0xF7F170, 0xFB6886, 0x7D247D, 0xE25B6A, 0x641791, 0x688E67, 0xEEC29C,
 131     0x3347A4, 0xB50B5F, 0xB992A9, 0x3FDE52, 0xA0A145, 0x26EDBE, 0x2A7448, 0xAC38B3,
 132     0x92C69D, 0x148A66, 0x181390, 0x9E5F6B, 0x01207C, 0x876C87, 0x8BF571, 0x0DB98A,
 133     0xF6092D, 0x7045D6, 0x7CDC20, 0xFA90DB, 0x65EFCC, 0xE3A337, 0xEF3AC1, 0x69763A,
 134     0x578814, 0xD1C4EF, 0xDD5D19, 0x5B11E2, 0xC46EF5, 0x42220E, 0x4EBBF8, 0xC8F703,
 135     0x3F964D, 0xB9DAB6, 0xB54340, 0x330FBB, 0xAC70AC, 0x2A3C57, 0x26A5A1, 0xA0E95A,
 136     0x9E1774, 0x185B8F, 0x14C279, 0x928E82, 0x0DF195, 0x8BBD6E, 0x872498, 0x016863,
 137     0xFAD8C4, 0x7C943F, 0x700DC9, 0xF64132, 0x693E25, 0xEF72DE, 0xE3EB28, 0x65A7D3,
 138     0x5B59FD, 0xDD1506, 0xD18CF0, 0x57C00B, 0xC8BF1C, 0x4EF3E7, 0x426A11, 0xC426EA,
 139     0x2AE476, 0xACA88D, 0xA0317B, 0x267D80, 0xB90297, 0x3F4E6C, 0x33D79A, 0xB59B61,
 140     0x8B654F, 0x0D29B4, 0x01B042, 0x87FCB9, 0x1883AE, 0x9ECF55, 0x9256A3, 0x141A58,
 141     0xEFAAFF, 0x69E604, 0x657FF2, 0xE33309, 0x7C4C1E, 0xFA00E5, 0xF69913, 0x70D5E8,
 142     0x4E2BC6, 0xC8673D, 0xC4FECB, 0x42B230, 0xDDCD27, 0x5B81DC, 0x57182A, 0xD154D1,
 143     0x26359F, 0xA07964, 0xACE092, 0x2AAC69, 0xB5D37E, 0x339F85, 0x3F0673, 0xB94A88,
 144     0x87B4A6, 0x01F85D, 0x0D61AB, 0x8B2D50, 0x145247, 0x921EBC, 0x9E874A, 0x18CBB1,
 145     0xE37B16, 0x6537ED, 0x69AE1B, 0xEFE2E0, 0x709DF7, 0xF6D10C, 0xFA48FA, 0x7C0401,
 146     0x42FA2F, 0xC4B6D4, 0xC82F22, 0x4E63D9, 0xD11CCE, 0x575035, 0x5BC9C3, 0xDD8538
 147 };
 148
 149 /* Initialize the protocol and registered fields */
 150 static int proto_sbas_l1;
 151
 152 // see ICAO Annex 10, Vol I, Appendix B, Section 3.5.3
 153 static int hf_sbas_l1_preamble;
 154 static int hf_sbas_l1_mt;
 155 static int hf_sbas_l1_chksum;
 156
 157 static int hf_sbas_l1_mt0;
 158 static int hf_sbas_l1_mt0_spare_1;
 159 static int hf_sbas_l1_mt0_spare_2;
 160 static int hf_sbas_l1_mt0_spare_3;
 161
 162 // see ICAO Annex 10, Vol I, Table B-38
 163 static int hf_sbas_l1_mt1;
 164 static int hf_sbas_l1_mt1_prn_mask_gps;
 165 static int hf_sbas_l1_mt1_prn_mask_glonass;
 166 static int hf_sbas_l1_mt1_prn_mask_spare_1;
 167 static int hf_sbas_l1_mt1_prn_mask_sbas;
 168 static int hf_sbas_l1_mt1_prn_mask_spare_2;
 169 static int hf_sbas_l1_mt1_iodp;
 170
 171 // see ICAO Annex 10, Vol I, Table B-39
 172 static int hf_sbas_l1_mt2;
 173 static int hf_sbas_l1_mt2_iodf_2;
 174 static int hf_sbas_l1_mt2_iodp;
 175 static int hf_sbas_l1_mt2_fc_1;
 176 static int hf_sbas_l1_mt2_fc_2;
 177 static int hf_sbas_l1_mt2_fc_3;
 178 static int hf_sbas_l1_mt2_fc_4;
 179 static int hf_sbas_l1_mt2_fc_5;
 180 static int hf_sbas_l1_mt2_fc_6;
 181 static int hf_sbas_l1_mt2_fc_7;
 182 static int hf_sbas_l1_mt2_fc_8;
 183 static int hf_sbas_l1_mt2_fc_9;
 184 static int hf_sbas_l1_mt2_fc_10;
 185 static int hf_sbas_l1_mt2_fc_11;
 186 static int hf_sbas_l1_mt2_fc_12;
 187 static int hf_sbas_l1_mt2_fc_13;
 188 static int hf_sbas_l1_mt2_udrei_1;
 189 static int hf_sbas_l1_mt2_udrei_2;
 190 static int hf_sbas_l1_mt2_udrei_3;
 191 static int hf_sbas_l1_mt2_udrei_4;
 192 static int hf_sbas_l1_mt2_udrei_5;
 193 static int hf_sbas_l1_mt2_udrei_6;
 194 static int hf_sbas_l1_mt2_udrei_7;
 195 static int hf_sbas_l1_mt2_udrei_8;
 196 static int hf_sbas_l1_mt2_udrei_9;
 197 static int hf_sbas_l1_mt2_udrei_10;
 198 static int hf_sbas_l1_mt2_udrei_11;
 199 static int hf_sbas_l1_mt2_udrei_12;
 200 static int hf_sbas_l1_mt2_udrei_13;
 201
 202 // see ICAO Annex 10, Vol I, Table B-39
 203 static int hf_sbas_l1_mt3;
 204 static int hf_sbas_l1_mt3_iodf_3;
 205 static int hf_sbas_l1_mt3_iodp;
 206 static int hf_sbas_l1_mt3_fc_14;
 207 static int hf_sbas_l1_mt3_fc_15;
 208 static int hf_sbas_l1_mt3_fc_16;
 209 static int hf_sbas_l1_mt3_fc_17;
 210 static int hf_sbas_l1_mt3_fc_18;
 211 static int hf_sbas_l1_mt3_fc_19;
 212 static int hf_sbas_l1_mt3_fc_20;
 213 static int hf_sbas_l1_mt3_fc_21;
 214 static int hf_sbas_l1_mt3_fc_22;
 215 static int hf_sbas_l1_mt3_fc_23;
 216 static int hf_sbas_l1_mt3_fc_24;
 217 static int hf_sbas_l1_mt3_fc_25;
 218 static int hf_sbas_l1_mt3_fc_26;
 219 static int hf_sbas_l1_mt3_udrei_14;
 220 static int hf_sbas_l1_mt3_udrei_15;
 221 static int hf_sbas_l1_mt3_udrei_16;
 222 static int hf_sbas_l1_mt3_udrei_17;
 223 static int hf_sbas_l1_mt3_udrei_18;
 224 static int hf_sbas_l1_mt3_udrei_19;
 225 static int hf_sbas_l1_mt3_udrei_20;
 226 static int hf_sbas_l1_mt3_udrei_21;
 227 static int hf_sbas_l1_mt3_udrei_22;
 228 static int hf_sbas_l1_mt3_udrei_23;
 229 static int hf_sbas_l1_mt3_udrei_24;
 230 static int hf_sbas_l1_mt3_udrei_25;
 231 static int hf_sbas_l1_mt3_udrei_26;
 232
 233 // see ICAO Annex 10, Vol I, Table B-39
 234 static int hf_sbas_l1_mt4;
 235 static int hf_sbas_l1_mt4_iodf_4;
 236 static int hf_sbas_l1_mt4_iodp;
 237 static int hf_sbas_l1_mt4_fc_27;
 238 static int hf_sbas_l1_mt4_fc_28;
 239 static int hf_sbas_l1_mt4_fc_29;
 240 static int hf_sbas_l1_mt4_fc_30;
 241 static int hf_sbas_l1_mt4_fc_31;
 242 static int hf_sbas_l1_mt4_fc_32;
 243 static int hf_sbas_l1_mt4_fc_33;
 244 static int hf_sbas_l1_mt4_fc_34;
 245 static int hf_sbas_l1_mt4_fc_35;
 246 static int hf_sbas_l1_mt4_fc_36;
 247 static int hf_sbas_l1_mt4_fc_37;
 248 static int hf_sbas_l1_mt4_fc_38;
 249 static int hf_sbas_l1_mt4_fc_39;
 250 static int hf_sbas_l1_mt4_udrei_27;
 251 static int hf_sbas_l1_mt4_udrei_28;
 252 static int hf_sbas_l1_mt4_udrei_29;
 253 static int hf_sbas_l1_mt4_udrei_30;
 254 static int hf_sbas_l1_mt4_udrei_31;
 255 static int hf_sbas_l1_mt4_udrei_32;
 256 static int hf_sbas_l1_mt4_udrei_33;
 257 static int hf_sbas_l1_mt4_udrei_34;
 258 static int hf_sbas_l1_mt4_udrei_35;
 259 static int hf_sbas_l1_mt4_udrei_36;
 260 static int hf_sbas_l1_mt4_udrei_37;
 261 static int hf_sbas_l1_mt4_udrei_38;
 262 static int hf_sbas_l1_mt4_udrei_39;
 263
 264 // see ICAO Annex 10, Vol I, Table B-39
 265 static int hf_sbas_l1_mt5;
 266 static int hf_sbas_l1_mt5_iodf_5;
 267 static int hf_sbas_l1_mt5_iodp;
 268 static int hf_sbas_l1_mt5_fc_40;
 269 static int hf_sbas_l1_mt5_fc_41;
 270 static int hf_sbas_l1_mt5_fc_42;
 271 static int hf_sbas_l1_mt5_fc_43;
 272 static int hf_sbas_l1_mt5_fc_44;
 273 static int hf_sbas_l1_mt5_fc_45;
 274 static int hf_sbas_l1_mt5_fc_46;
 275 static int hf_sbas_l1_mt5_fc_47;
 276 static int hf_sbas_l1_mt5_fc_48;
 277 static int hf_sbas_l1_mt5_fc_49;
 278 static int hf_sbas_l1_mt5_fc_50;
 279 static int hf_sbas_l1_mt5_fc_51;
 280 static int hf_sbas_l1_mt5_fc_52;
 281 static int hf_sbas_l1_mt5_udrei_40;
 282 static int hf_sbas_l1_mt5_udrei_41;
 283 static int hf_sbas_l1_mt5_udrei_42;
 284 static int hf_sbas_l1_mt5_udrei_43;
 285 static int hf_sbas_l1_mt5_udrei_44;
 286 static int hf_sbas_l1_mt5_udrei_45;
 287 static int hf_sbas_l1_mt5_udrei_46;
 288 static int hf_sbas_l1_mt5_udrei_47;
 289 static int hf_sbas_l1_mt5_udrei_48;
 290 static int hf_sbas_l1_mt5_udrei_49;
 291 static int hf_sbas_l1_mt5_udrei_50;
 292 static int hf_sbas_l1_mt5_udrei_51;
 293 static int hf_sbas_l1_mt5_udrei_52;
 294
 295 // see ICAO Annex 10, Vol I, Table B-40
 296 static int hf_sbas_l1_mt6;
 297 static int hf_sbas_l1_mt6_iodf_2;
 298 static int hf_sbas_l1_mt6_iodf_3;
 299 static int hf_sbas_l1_mt6_iodf_4;
 300 static int hf_sbas_l1_mt6_iodf_5;
 301 static int hf_sbas_l1_mt6_udrei_1;
 302 static int hf_sbas_l1_mt6_udrei_2;
 303 static int hf_sbas_l1_mt6_udrei_3;
 304 static int hf_sbas_l1_mt6_udrei_4;
 305 static int hf_sbas_l1_mt6_udrei_5;
 306 static int hf_sbas_l1_mt6_udrei_6;
 307 static int hf_sbas_l1_mt6_udrei_7;
 308 static int hf_sbas_l1_mt6_udrei_8;
 309 static int hf_sbas_l1_mt6_udrei_9;
 310 static int hf_sbas_l1_mt6_udrei_10;
 311 static int hf_sbas_l1_mt6_udrei_11;
 312 static int hf_sbas_l1_mt6_udrei_12;
 313 static int hf_sbas_l1_mt6_udrei_13;
 314 static int hf_sbas_l1_mt6_udrei_14;
 315 static int hf_sbas_l1_mt6_udrei_15;
 316 static int hf_sbas_l1_mt6_udrei_16;
 317 static int hf_sbas_l1_mt6_udrei_17;
 318 static int hf_sbas_l1_mt6_udrei_18;
 319 static int hf_sbas_l1_mt6_udrei_19;
 320 static int hf_sbas_l1_mt6_udrei_20;
 321 static int hf_sbas_l1_mt6_udrei_21;
 322 static int hf_sbas_l1_mt6_udrei_22;
 323 static int hf_sbas_l1_mt6_udrei_23;
 324 static int hf_sbas_l1_mt6_udrei_24;
 325 static int hf_sbas_l1_mt6_udrei_25;
 326 static int hf_sbas_l1_mt6_udrei_26;
 327 static int hf_sbas_l1_mt6_udrei_27;
 328 static int hf_sbas_l1_mt6_udrei_28;
 329 static int hf_sbas_l1_mt6_udrei_29;
 330 static int hf_sbas_l1_mt6_udrei_30;
 331 static int hf_sbas_l1_mt6_udrei_31;
 332 static int hf_sbas_l1_mt6_udrei_32;
 333 static int hf_sbas_l1_mt6_udrei_33;
 334 static int hf_sbas_l1_mt6_udrei_34;
 335 static int hf_sbas_l1_mt6_udrei_35;
 336 static int hf_sbas_l1_mt6_udrei_36;
 337 static int hf_sbas_l1_mt6_udrei_37;
 338 static int hf_sbas_l1_mt6_udrei_38;
 339 static int hf_sbas_l1_mt6_udrei_39;
 340 static int hf_sbas_l1_mt6_udrei_40;
 341 static int hf_sbas_l1_mt6_udrei_41;
 342 static int hf_sbas_l1_mt6_udrei_42;
 343 static int hf_sbas_l1_mt6_udrei_43;
 344 static int hf_sbas_l1_mt6_udrei_44;
 345 static int hf_sbas_l1_mt6_udrei_45;
 346 static int hf_sbas_l1_mt6_udrei_46;
 347 static int hf_sbas_l1_mt6_udrei_47;
 348 static int hf_sbas_l1_mt6_udrei_48;
 349 static int hf_sbas_l1_mt6_udrei_49;
 350 static int hf_sbas_l1_mt6_udrei_50;
 351 static int hf_sbas_l1_mt6_udrei_51;
 352
 353 // see ICAO Annex 10, Vol I, Table B-41
 354 static int hf_sbas_l1_mt7;
 355 static int hf_sbas_l1_mt7_t_lat;
 356 static int hf_sbas_l1_mt7_iodp;
 357 static int hf_sbas_l1_mt7_spare;
 358 static int hf_sbas_l1_mt7_ai_1;
 359 static int hf_sbas_l1_mt7_ai_2;
 360 static int hf_sbas_l1_mt7_ai_3;
 361 static int hf_sbas_l1_mt7_ai_4;
 362 static int hf_sbas_l1_mt7_ai_5;
 363 static int hf_sbas_l1_mt7_ai_6;
 364 static int hf_sbas_l1_mt7_ai_7;
 365 static int hf_sbas_l1_mt7_ai_8;
 366 static int hf_sbas_l1_mt7_ai_9;
 367 static int hf_sbas_l1_mt7_ai_10;
 368 static int hf_sbas_l1_mt7_ai_11;
 369 static int hf_sbas_l1_mt7_ai_12;
 370 static int hf_sbas_l1_mt7_ai_13;
 371 static int hf_sbas_l1_mt7_ai_14;
 372 static int hf_sbas_l1_mt7_ai_15;
 373 static int hf_sbas_l1_mt7_ai_16;
 374 static int hf_sbas_l1_mt7_ai_17;
 375 static int hf_sbas_l1_mt7_ai_18;
 376 static int hf_sbas_l1_mt7_ai_19;
 377 static int hf_sbas_l1_mt7_ai_20;
 378 static int hf_sbas_l1_mt7_ai_21;
 379 static int hf_sbas_l1_mt7_ai_22;
 380 static int hf_sbas_l1_mt7_ai_23;
 381 static int hf_sbas_l1_mt7_ai_24;
 382 static int hf_sbas_l1_mt7_ai_25;
 383 static int hf_sbas_l1_mt7_ai_26;
 384 static int hf_sbas_l1_mt7_ai_27;
 385 static int hf_sbas_l1_mt7_ai_28;
 386 static int hf_sbas_l1_mt7_ai_29;
 387 static int hf_sbas_l1_mt7_ai_30;
 388 static int hf_sbas_l1_mt7_ai_31;
 389 static int hf_sbas_l1_mt7_ai_32;
 390 static int hf_sbas_l1_mt7_ai_33;
 391 static int hf_sbas_l1_mt7_ai_34;
 392 static int hf_sbas_l1_mt7_ai_35;
 393 static int hf_sbas_l1_mt7_ai_36;
 394 static int hf_sbas_l1_mt7_ai_37;
 395 static int hf_sbas_l1_mt7_ai_38;
 396 static int hf_sbas_l1_mt7_ai_39;
 397 static int hf_sbas_l1_mt7_ai_40;
 398 static int hf_sbas_l1_mt7_ai_41;
 399 static int hf_sbas_l1_mt7_ai_42;
 400 static int hf_sbas_l1_mt7_ai_43;
 401 static int hf_sbas_l1_mt7_ai_44;
 402 static int hf_sbas_l1_mt7_ai_45;
 403 static int hf_sbas_l1_mt7_ai_46;
 404 static int hf_sbas_l1_mt7_ai_47;
 405 static int hf_sbas_l1_mt7_ai_48;
 406 static int hf_sbas_l1_mt7_ai_49;
 407 static int hf_sbas_l1_mt7_ai_50;
 408 static int hf_sbas_l1_mt7_ai_51;
 409
 410 // see ICAO Annex 10, Vol I, Table B-45
 411 static int hf_sbas_l1_mt17;
 412 static int hf_sbas_l1_mt17_reserved;
 413 static int hf_sbas_l1_mt17_prn;
 414 static int hf_sbas_l1_mt17_health_and_status;
 415 static int hf_sbas_l1_mt17_health_and_status_spid;
 416 static int hf_sbas_l1_mt17_health_and_status_spare;
 417 static int hf_sbas_l1_mt17_health_and_status_sat_status_basic_corrections;
 418 static int hf_sbas_l1_mt17_health_and_status_precision_corrections;
 419 static int hf_sbas_l1_mt17_health_and_status_ranging;
 420 static int hf_sbas_l1_mt17_x_ga;
 421 static int hf_sbas_l1_mt17_y_ga;
 422 static int hf_sbas_l1_mt17_z_ga;
 423 static int hf_sbas_l1_mt17_x_ga_vel;
 424 static int hf_sbas_l1_mt17_y_ga_vel;
 425 static int hf_sbas_l1_mt17_z_ga_vel;
 426 static int hf_sbas_l1_mt17_t_a;
 427
 428 static int * const sbas_l1_mt17_health_and_status_fields[] = {
 429     &hf_sbas_l1_mt17_health_and_status_spid,
 430     &hf_sbas_l1_mt17_health_and_status_spare,
 431     &hf_sbas_l1_mt17_health_and_status_sat_status_basic_corrections,
 432     &hf_sbas_l1_mt17_health_and_status_precision_corrections,
 433     &hf_sbas_l1_mt17_health_and_status_ranging,
 434     NULL
 435 };
 436
 437 // see ICAO Annex 10, Vol I, Table B-46
 438 static int hf_sbas_l1_mt18;
 439 static int hf_sbas_l1_mt18_nr_igp_bands;
 440 static int hf_sbas_l1_mt18_igp_band_id;
 441 static int hf_sbas_l1_mt18_iodi_k;
 442 static int hf_sbas_l1_mt18_igp_mask_180w;
 443 static int hf_sbas_l1_mt18_igp_mask_175w;
 444 static int hf_sbas_l1_mt18_igp_mask_170w;
 445 static int hf_sbas_l1_mt18_igp_mask_165w;
 446 static int hf_sbas_l1_mt18_igp_mask_160w;
 447 static int hf_sbas_l1_mt18_igp_mask_155w;
 448 static int hf_sbas_l1_mt18_igp_mask_150w;
 449 static int hf_sbas_l1_mt18_igp_mask_145w;
 450 static int hf_sbas_l1_mt18_igp_mask_140w;
 451 static int hf_sbas_l1_mt18_igp_mask_135w;
 452 static int hf_sbas_l1_mt18_igp_mask_130w;
 453 static int hf_sbas_l1_mt18_igp_mask_125w;
 454 static int hf_sbas_l1_mt18_igp_mask_120w;
 455 static int hf_sbas_l1_mt18_igp_mask_115w;
 456 static int hf_sbas_l1_mt18_igp_mask_110w;
 457 static int hf_sbas_l1_mt18_igp_mask_105w;
 458 static int hf_sbas_l1_mt18_igp_mask_100w;
 459 static int hf_sbas_l1_mt18_igp_mask_95w;
 460 static int hf_sbas_l1_mt18_igp_mask_90w;
 461 static int hf_sbas_l1_mt18_igp_mask_85w;
 462 static int hf_sbas_l1_mt18_igp_mask_80w;
 463 static int hf_sbas_l1_mt18_igp_mask_75w;
 464 static int hf_sbas_l1_mt18_igp_mask_70w;
 465 static int hf_sbas_l1_mt18_igp_mask_65w;
 466 static int hf_sbas_l1_mt18_igp_mask_60w;
 467 static int hf_sbas_l1_mt18_igp_mask_55w;
 468 static int hf_sbas_l1_mt18_igp_mask_50w;
 469 static int hf_sbas_l1_mt18_igp_mask_45w;
 470 static int hf_sbas_l1_mt18_igp_mask_40w;
 471 static int hf_sbas_l1_mt18_igp_mask_35w;
 472 static int hf_sbas_l1_mt18_igp_mask_30w;
 473 static int hf_sbas_l1_mt18_igp_mask_25w;
 474 static int hf_sbas_l1_mt18_igp_mask_20w;
 475 static int hf_sbas_l1_mt18_igp_mask_15w;
 476 static int hf_sbas_l1_mt18_igp_mask_10w;
 477 static int hf_sbas_l1_mt18_igp_mask_5w;
 478 static int hf_sbas_l1_mt18_igp_mask_0;
 479 static int hf_sbas_l1_mt18_igp_mask_5e;
 480 static int hf_sbas_l1_mt18_igp_mask_10e;
 481 static int hf_sbas_l1_mt18_igp_mask_15e;
 482 static int hf_sbas_l1_mt18_igp_mask_20e;
 483 static int hf_sbas_l1_mt18_igp_mask_25e;
 484 static int hf_sbas_l1_mt18_igp_mask_30e;
 485 static int hf_sbas_l1_mt18_igp_mask_35e;
 486 static int hf_sbas_l1_mt18_igp_mask_40e;
 487 static int hf_sbas_l1_mt18_igp_mask_45e;
 488 static int hf_sbas_l1_mt18_igp_mask_50e;
 489 static int hf_sbas_l1_mt18_igp_mask_55e;
 490 static int hf_sbas_l1_mt18_igp_mask_60e;
 491 static int hf_sbas_l1_mt18_igp_mask_65e;
 492 static int hf_sbas_l1_mt18_igp_mask_70e;
 493 static int hf_sbas_l1_mt18_igp_mask_75e;
 494 static int hf_sbas_l1_mt18_igp_mask_80e;
 495 static int hf_sbas_l1_mt18_igp_mask_85e;
 496 static int hf_sbas_l1_mt18_igp_mask_90e;
 497 static int hf_sbas_l1_mt18_igp_mask_95e;
 498 static int hf_sbas_l1_mt18_igp_mask_100e;
 499 static int hf_sbas_l1_mt18_igp_mask_105e;
 500 static int hf_sbas_l1_mt18_igp_mask_110e;
 501 static int hf_sbas_l1_mt18_igp_mask_115e;
 502 static int hf_sbas_l1_mt18_igp_mask_120e;
 503 static int hf_sbas_l1_mt18_igp_mask_125e;
 504 static int hf_sbas_l1_mt18_igp_mask_130e;
 505 static int hf_sbas_l1_mt18_igp_mask_135e;
 506 static int hf_sbas_l1_mt18_igp_mask_140e;
 507 static int hf_sbas_l1_mt18_igp_mask_145e;
 508 static int hf_sbas_l1_mt18_igp_mask_150e;
 509 static int hf_sbas_l1_mt18_igp_mask_155e;
 510 static int hf_sbas_l1_mt18_igp_mask_160e;
 511 static int hf_sbas_l1_mt18_igp_mask_165e;
 512 static int hf_sbas_l1_mt18_igp_mask_170e;
 513 static int hf_sbas_l1_mt18_igp_mask_175e;
 514 static int hf_sbas_l1_mt18_igp_mask_60n_1;
 515 static int hf_sbas_l1_mt18_igp_mask_60n_2;
 516 static int hf_sbas_l1_mt18_igp_mask_65n;
 517 static int hf_sbas_l1_mt18_igp_mask_70n;
 518 static int hf_sbas_l1_mt18_igp_mask_75n;
 519 static int hf_sbas_l1_mt18_igp_mask_85n;
 520 static int hf_sbas_l1_mt18_igp_mask_60s_1;
 521 static int hf_sbas_l1_mt18_igp_mask_60s_2;
 522 static int hf_sbas_l1_mt18_igp_mask_65s;
 523 static int hf_sbas_l1_mt18_igp_mask_70s;
 524 static int hf_sbas_l1_mt18_igp_mask_75s;
 525 static int hf_sbas_l1_mt18_igp_mask_85s;
 526 static int hf_sbas_l1_mt18_spare;
 527
 528 // see ICAO Annex 10, Vol I, Table B-47
 529 static int hf_sbas_l1_mt24;
 530 static int hf_sbas_l1_mt24_fc_i1;
 531 static int hf_sbas_l1_mt24_fc_i2;
 532 static int hf_sbas_l1_mt24_fc_i3;
 533 static int hf_sbas_l1_mt24_fc_i4;
 534 static int hf_sbas_l1_mt24_fc_i5;
 535 static int hf_sbas_l1_mt24_fc_i6;
 536 static int hf_sbas_l1_mt24_udrei_i1;
 537 static int hf_sbas_l1_mt24_udrei_i2;
 538 static int hf_sbas_l1_mt24_udrei_i3;
 539 static int hf_sbas_l1_mt24_udrei_i4;
 540 static int hf_sbas_l1_mt24_udrei_i5;
 541 static int hf_sbas_l1_mt24_udrei_i6;
 542 static int hf_sbas_l1_mt24_iodp;
 543 static int hf_sbas_l1_mt24_fc_type;
 544 static int hf_sbas_l1_mt24_iodf_j;
 545 static int hf_sbas_l1_mt24_spare;
 546 static int hf_sbas_l1_mt24_velocity_code;
 547 static int hf_sbas_l1_mt24_v0_prn_mask_nr_1;
 548 static int hf_sbas_l1_mt24_v0_iod_1;
 549 static int hf_sbas_l1_mt24_v0_delta_x_1;
 550 static int hf_sbas_l1_mt24_v0_delta_y_1;
 551 static int hf_sbas_l1_mt24_v0_delta_z_1;
 552 static int hf_sbas_l1_mt24_v0_delta_a_1_f0;
 553 static int hf_sbas_l1_mt24_v0_prn_mask_nr_2;
 554 static int hf_sbas_l1_mt24_v0_iod_2;
 555 static int hf_sbas_l1_mt24_v0_delta_x_2;
 556 static int hf_sbas_l1_mt24_v0_delta_y_2;
 557 static int hf_sbas_l1_mt24_v0_delta_z_2;
 558 static int hf_sbas_l1_mt24_v0_delta_a_2_f0;
 559 static int hf_sbas_l1_mt24_v0_iodp;
 560 static int hf_sbas_l1_mt24_v0_spare;
 561 static int hf_sbas_l1_mt24_v1_prn_mask_nr;
 562 static int hf_sbas_l1_mt24_v1_iod;
 563 static int hf_sbas_l1_mt24_v1_delta_x;
 564 static int hf_sbas_l1_mt24_v1_delta_y;
 565 static int hf_sbas_l1_mt24_v1_delta_z;
 566 static int hf_sbas_l1_mt24_v1_delta_a_f0;
 567 static int hf_sbas_l1_mt24_v1_delta_x_vel;
 568 static int hf_sbas_l1_mt24_v1_delta_y_vel;
 569 static int hf_sbas_l1_mt24_v1_delta_z_vel;
 570 static int hf_sbas_l1_mt24_v1_delta_a_f1;
 571 static int hf_sbas_l1_mt24_v1_t_lt;
 572 static int hf_sbas_l1_mt24_v1_iodp;
 573
 574 // see ICAO Annex 10, Vol I, Table B-48
 575 static int hf_sbas_l1_mt25;
 576 static int hf_sbas_l1_mt25_h1_velocity_code;
 577 static int hf_sbas_l1_mt25_h1_v0_prn_mask_nr_1;
 578 static int hf_sbas_l1_mt25_h1_v0_iod_1;
 579 static int hf_sbas_l1_mt25_h1_v0_delta_x_1;
 580 static int hf_sbas_l1_mt25_h1_v0_delta_y_1;
 581 static int hf_sbas_l1_mt25_h1_v0_delta_z_1;
 582 static int hf_sbas_l1_mt25_h1_v0_delta_a_1_f0;
 583 static int hf_sbas_l1_mt25_h1_v0_prn_mask_nr_2;
 584 static int hf_sbas_l1_mt25_h1_v0_iod_2;
 585 static int hf_sbas_l1_mt25_h1_v0_delta_x_2;
 586 static int hf_sbas_l1_mt25_h1_v0_delta_y_2;
 587 static int hf_sbas_l1_mt25_h1_v0_delta_z_2;
 588 static int hf_sbas_l1_mt25_h1_v0_delta_a_2_f0;
 589 static int hf_sbas_l1_mt25_h1_v0_iodp;
 590 static int hf_sbas_l1_mt25_h1_v0_spare;
 591 static int hf_sbas_l1_mt25_h1_v1_prn_mask_nr;
 592 static int hf_sbas_l1_mt25_h1_v1_iod;
 593 static int hf_sbas_l1_mt25_h1_v1_delta_x;
 594 static int hf_sbas_l1_mt25_h1_v1_delta_y;
 595 static int hf_sbas_l1_mt25_h1_v1_delta_z;
 596 static int hf_sbas_l1_mt25_h1_v1_delta_a_f0;
 597 static int hf_sbas_l1_mt25_h1_v1_delta_x_vel;
 598 static int hf_sbas_l1_mt25_h1_v1_delta_y_vel;
 599 static int hf_sbas_l1_mt25_h1_v1_delta_z_vel;
 600 static int hf_sbas_l1_mt25_h1_v1_delta_a_f1;
 601 static int hf_sbas_l1_mt25_h1_v1_t_lt;
 602 static int hf_sbas_l1_mt25_h1_v1_iodp;
 603 static int hf_sbas_l1_mt25_h2_velocity_code;
 604 static int hf_sbas_l1_mt25_h2_v0_prn_mask_nr_1;
 605 static int hf_sbas_l1_mt25_h2_v0_iod_1;
 606 static int hf_sbas_l1_mt25_h2_v0_delta_x_1;
 607 static int hf_sbas_l1_mt25_h2_v0_delta_y_1;
 608 static int hf_sbas_l1_mt25_h2_v0_delta_z_1;
 609 static int hf_sbas_l1_mt25_h2_v0_delta_a_1_f0;
 610 static int hf_sbas_l1_mt25_h2_v0_prn_mask_nr_2;
 611 static int hf_sbas_l1_mt25_h2_v0_iod_2;
 612 static int hf_sbas_l1_mt25_h2_v0_delta_x_2;
 613 static int hf_sbas_l1_mt25_h2_v0_delta_y_2;
 614 static int hf_sbas_l1_mt25_h2_v0_delta_z_2;
 615 static int hf_sbas_l1_mt25_h2_v0_delta_a_2_f0;
 616 static int hf_sbas_l1_mt25_h2_v0_iodp;
 617 static int hf_sbas_l1_mt25_h2_v0_spare;
 618 static int hf_sbas_l1_mt25_h2_v1_prn_mask_nr;
 619 static int hf_sbas_l1_mt25_h2_v1_iod;
 620 static int hf_sbas_l1_mt25_h2_v1_delta_x;
 621 static int hf_sbas_l1_mt25_h2_v1_delta_y;
 622 static int hf_sbas_l1_mt25_h2_v1_delta_z;
 623 static int hf_sbas_l1_mt25_h2_v1_delta_a_f0;
 624 static int hf_sbas_l1_mt25_h2_v1_delta_x_vel;
 625 static int hf_sbas_l1_mt25_h2_v1_delta_y_vel;
 626 static int hf_sbas_l1_mt25_h2_v1_delta_z_vel;
 627 static int hf_sbas_l1_mt25_h2_v1_delta_a_f1;
 628 static int hf_sbas_l1_mt25_h2_v1_t_lt;
 629 static int hf_sbas_l1_mt25_h2_v1_iodp;
 630
 631 // see ICAO Annex 10, Vol I, Table B-50
 632 static int hf_sbas_l1_mt26;
 633 static int hf_sbas_l1_mt26_igp_band_id;
 634 static int hf_sbas_l1_mt26_igp_block_id;
 635 static int hf_sbas_l1_mt26_igp_vertical_delay_est_1;
 636 static int hf_sbas_l1_mt26_givei_1;
 637 static int hf_sbas_l1_mt26_igp_vertical_delay_est_2;
 638 static int hf_sbas_l1_mt26_givei_2;
 639 static int hf_sbas_l1_mt26_igp_vertical_delay_est_3;
 640 static int hf_sbas_l1_mt26_givei_3;
 641 static int hf_sbas_l1_mt26_igp_vertical_delay_est_4;
 642 static int hf_sbas_l1_mt26_givei_4;
 643 static int hf_sbas_l1_mt26_igp_vertical_delay_est_5;
 644 static int hf_sbas_l1_mt26_givei_5;
 645 static int hf_sbas_l1_mt26_igp_vertical_delay_est_6;
 646 static int hf_sbas_l1_mt26_givei_6;
 647 static int hf_sbas_l1_mt26_igp_vertical_delay_est_7;
 648 static int hf_sbas_l1_mt26_givei_7;
 649 static int hf_sbas_l1_mt26_igp_vertical_delay_est_8;
 650 static int hf_sbas_l1_mt26_givei_8;
 651 static int hf_sbas_l1_mt26_igp_vertical_delay_est_9;
 652 static int hf_sbas_l1_mt26_givei_9;
 653 static int hf_sbas_l1_mt26_igp_vertical_delay_est_10;
 654 static int hf_sbas_l1_mt26_givei_10;
 655 static int hf_sbas_l1_mt26_igp_vertical_delay_est_11;
 656 static int hf_sbas_l1_mt26_givei_11;
 657 static int hf_sbas_l1_mt26_igp_vertical_delay_est_12;
 658 static int hf_sbas_l1_mt26_givei_12;
 659 static int hf_sbas_l1_mt26_igp_vertical_delay_est_13;
 660 static int hf_sbas_l1_mt26_givei_13;
 661 static int hf_sbas_l1_mt26_igp_vertical_delay_est_14;
 662 static int hf_sbas_l1_mt26_givei_14;
 663 static int hf_sbas_l1_mt26_igp_vertical_delay_est_15;
 664 static int hf_sbas_l1_mt26_givei_15;
 665 static int hf_sbas_l1_mt26_iodi_k;
 666 static int hf_sbas_l1_mt26_spare;
 667
 668 // see ICAO Annex 10, Vol I, Table B-52
 669 static int hf_sbas_l1_mt63;
 670 static int hf_sbas_l1_mt63_spare_1;
 671 static int hf_sbas_l1_mt63_spare_2;
 672 static int hf_sbas_l1_mt63_spare_3;
 673
 674 static dissector_table_t sbas_l1_mt_dissector_table;
 675
 676 static expert_field ei_sbas_l1_preamble;
 677 static expert_field ei_sbas_l1_mt0;
 678 static expert_field ei_sbas_l1_crc;
 679 static expert_field ei_sbas_l1_mt26_igp_band_id;
 680 static expert_field ei_sbas_l1_mt26_igp_block_id;
 681
 682 static int ett_sbas_l1;
 683 static int ett_sbas_l1_mt0;
 684 static int ett_sbas_l1_mt1;
 685 static int ett_sbas_l1_mt2;
 686 static int ett_sbas_l1_mt3;
 687 static int ett_sbas_l1_mt4;
 688 static int ett_sbas_l1_mt5;
 689 static int ett_sbas_l1_mt6;
 690 static int ett_sbas_l1_mt7;
 691 static int ett_sbas_l1_mt17;
 692 static int ett_sbas_l1_mt17_prn_data[3];
 693 static int ett_sbas_l1_mt17_health_and_status;
 694 static int ett_sbas_l1_mt18;
 695 static int ett_sbas_l1_mt24;
 696 static int ett_sbas_l1_mt25;
 697 static int ett_sbas_l1_mt26;
 698 static int ett_sbas_l1_mt63;
 699
 700 // compute the CRC24Q checksum for an SBAS L1 nav msg
 701 // see ICAO Annex 10, Vol I, Appendix B, Section 3.5.3.5
 702 static uint32_t sbas_crc24q(const uint8_t *data) {
 703     uint32_t crc = 0;
 704
 705     // source byte and bit level index
 706     int s8 = 0, s1 = 7;
 707
 708     uint8_t s,d = 0;
 709
 710     // At byte level, nav msg needs to be right aligned.
 711     // So, pretend that 6 bits (with value zero) have been processed.
 712     uint8_t d1 = 6;
 713
 714     // process 226 bits nav msg (= 28 bytes + 2 bits)
 715     while ((s8 < 28) || (s8 == 28 && s1 > 5)) {
 716
 717         // get next bit from nav msg
 718         s = (data[s8] >> s1) & 0x01;
 719
 720         // include next bit
 721         d = (d << 1) ^ s;
 722
 723         // 8 bits included?
 724         if (d1 == 7) {
 725             // do crc update
 726             crc=((crc<<8) & 0xffffff) ^ CRC24Q_TBL[(crc>>16) ^ d];
 727
 728             d1 = 0;
 729         }
 730         else {
 731             d1++;
 732         }
 733
 734         // move to next byte if the last bit of current one was processed.
 735         if (s1 == 0) {
 736             s8++;
 737             s1 = 7;
 738         }
 739         else {
 740             s1--;
 741         }
 742     }
 743
 744     return crc;
 745 }
 746
 747 /* Format GEO position (X or Y axis) with 2600m resolution */
 748 static void fmt_geo_xy_position(char *label, int32_t c) {
 749     snprintf(label, ITEM_LABEL_LENGTH, "%d m", c * 2600);
 750 }
 751
 752 /* Format GEO position (Z axis) with 26000m resolution */
 753 static void fmt_geo_z_position(char *label, int32_t c) {
 754     snprintf(label, ITEM_LABEL_LENGTH, "%d m", c * 26000);
 755 }
 756
 757 /* Format GEO velocity (X or Y axis) with 10m/s resolution */
 758 static void fmt_geo_xy_velocity(char *label, int32_t c) {
 759     snprintf(label, ITEM_LABEL_LENGTH, "%d m/s", c * 10);
 760 }
 761
 762 /* Format GEO velocity (Z axis) with 60m/s resolution */
 763 static void fmt_geo_z_velocity(char *label, int32_t c) {
 764     snprintf(label, ITEM_LABEL_LENGTH, "%d m/s", c * 60);
 765 }
 766
 767 /* Format time of almanac with 64s resolution */
 768 static void fmt_time_of_almanac(char *label, uint32_t c) {
 769     c = c * 64;
 770     snprintf(label, ITEM_LABEL_LENGTH, "%us (%02u:%02u:%02u)", c, c / 3600, (c / 60) % 60, c % 60);
 771 }
 772
 773 /* Format clock corrections */
 774 static void fmt_clock_correction(char *label, int32_t c) {
 775     snprintf(label, ITEM_LABEL_LENGTH, "%d * 2^-31 s", c);
 776 }
 777
 778 /* Format corrections with 0.125m resolution */
 779 static void fmt_correction_125m(char *label, int32_t c) {
 780     c = c * 125;
 781     if (c >= 0) {
 782         snprintf(label, ITEM_LABEL_LENGTH, "%d.%03dm", c / 1000, c % 1000);
 783     }
 784     else {
 785         snprintf(label, ITEM_LABEL_LENGTH, "-%d.%03dm", -c / 1000, -c % 1000);
 786     }
 787 }
 788
 789 /* Format velocity corrections with 2^-11 m/s resolution */
 790 static void fmt_velo_correction(char *label, int32_t c) {
 791     int64_t temp = c * INT64_C(48828125);
 792     if (c >= 0) {
 793         snprintf(label, ITEM_LABEL_LENGTH, " %" PRId64 ".%011" PRId64 "m/s", temp / 100000000000, temp % 100000000000);
 794     }
 795     else {
 796         snprintf(label, ITEM_LABEL_LENGTH, "-%" PRId64 ".%011" PRId64 "m/s", -temp / 100000000000, -temp % 100000000000);
 797     }
 798 }
 799
 800 /* Format clock rate corrections with 2^-39 s/s resolution */
 801 static void fmt_clk_rate_correction(char *label, int32_t c) {
 802     snprintf(label, ITEM_LABEL_LENGTH, "%d * 2^-39s/s", c);
 803 }
 804
 805 /* Format time of applicability with 16s resolution */
 806 static void fmt_time_of_applicability(char *label, uint32_t c) {
 807     c = c * 16;
 808     snprintf(label, ITEM_LABEL_LENGTH, "%us (%02u:%02u:%02u)", c, c / 3600, (c / 60) % 60, c % 60);
 809 }
 810
 811 /* Dissect SBAS L1 message */
 812 static int dissect_sbas_l1(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void *data _U_) {
 813     tvbuff_t *next_tvb;
 814     uint32_t preamble, mt, cmp_crc;
 815
 816     col_set_str(pinfo->cinfo, COL_PROTOCOL, "SBAS L1");
 817     col_clear(pinfo->cinfo, COL_INFO);
 818
 819     proto_item *ti = proto_tree_add_item(tree, proto_sbas_l1, tvb, 0, 32, ENC_NA);
 820     proto_tree *sbas_l1_tree = proto_item_add_subtree(ti, ett_sbas_l1);
 821
 822     // preamble
 823     proto_item* pi_preamble = proto_tree_add_item_ret_uint(
 824             sbas_l1_tree, hf_sbas_l1_preamble,
 825             tvb, 0, 1, ENC_BIG_ENDIAN,
 826             &preamble);
 827     if (preamble != SBAS_L1_PREAMBLE_1 &&
 828             preamble != SBAS_L1_PREAMBLE_2 &&
 829             preamble != SBAS_L1_PREAMBLE_3) {
 830         expert_add_info_format(pinfo, pi_preamble, &ei_sbas_l1_preamble,
 831                 "Erroneous preamble");
 832     }
 833
 834     // message type
 835     proto_item* pi_mt = proto_tree_add_item_ret_uint(
 836             sbas_l1_tree, hf_sbas_l1_mt,
 837             tvb, 1, 1, ENC_BIG_ENDIAN,
 838             &mt);
 839     if (mt == 0) { // flag "Do Not Use" MT0 messages
 840         expert_add_info(pinfo, pi_mt, &ei_sbas_l1_mt0);
 841     }
 842
 843     // checksum
 844     cmp_crc = sbas_crc24q((uint8_t *)tvb_memdup(pinfo->pool, tvb, 0, 29));
 845     proto_tree_add_checksum(sbas_l1_tree, tvb, 28, hf_sbas_l1_chksum, -1,
 846             &ei_sbas_l1_crc, NULL, cmp_crc, ENC_BIG_ENDIAN, PROTO_CHECKSUM_VERIFY);
 847
 848     // try to dissect MT data
 849     next_tvb = tvb_new_subset_length(tvb, 1, 28);
 850     if (!dissector_try_uint(sbas_l1_mt_dissector_table, mt, next_tvb, pinfo, tree)) {
 851         call_data_dissector(next_tvb, pinfo, tree);
 852     }
 853
 854     return tvb_captured_length(tvb);
 855 }
 856
 857 /* Dissect SBAS L1 MT 0 */
 858 static int dissect_sbas_l1_mt0(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void *data _U_) {
 859     col_set_str(pinfo->cinfo, COL_PROTOCOL, "SBAS L1 MT0");
 860     col_clear(pinfo->cinfo, COL_INFO);
 861
 862     proto_item *ti = proto_tree_add_item(tree, hf_sbas_l1_mt0, tvb, 0, 32, ENC_NA);
 863     proto_tree *sbas_l1_mt0_tree = proto_item_add_subtree(ti, ett_sbas_l1_mt0);
 864
 865     proto_tree_add_item(sbas_l1_mt0_tree, hf_sbas_l1_mt0_spare_1, tvb,  0,  1, ENC_NA);
 866     proto_tree_add_item(sbas_l1_mt0_tree, hf_sbas_l1_mt0_spare_2, tvb,  1, 26, ENC_NA);
 867     proto_tree_add_item(sbas_l1_mt0_tree, hf_sbas_l1_mt0_spare_3, tvb, 27,  1, ENC_NA);
 868
 869     return tvb_captured_length(tvb);
 870 }
 871
 872 /* Dissect SBAS L1 MT 1 */
 873 static int dissect_sbas_l1_mt1(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void *data _U_) {
 874     col_set_str(pinfo->cinfo, COL_PROTOCOL, "SBAS L1 MT1");
 875     col_clear(pinfo->cinfo, COL_INFO);
 876
 877     proto_item *ti = proto_tree_add_item(tree, hf_sbas_l1_mt1, tvb, 0, 32, ENC_NA);
 878     proto_tree *sbas_l1_mt1_tree = proto_item_add_subtree(ti, ett_sbas_l1_mt1);
 879
 880     proto_tree_add_item(sbas_l1_mt1_tree, hf_sbas_l1_mt1_prn_mask_gps,     tvb, 0,  8, ENC_BIG_ENDIAN);
 881     proto_tree_add_item(sbas_l1_mt1_tree, hf_sbas_l1_mt1_prn_mask_glonass, tvb, 5,  8, ENC_BIG_ENDIAN);
 882     proto_tree_add_item(sbas_l1_mt1_tree, hf_sbas_l1_mt1_prn_mask_spare_1, tvb, 8,  8, ENC_BIG_ENDIAN);
 883     proto_tree_add_item(sbas_l1_mt1_tree, hf_sbas_l1_mt1_prn_mask_sbas,    tvb, 15, 8, ENC_BIG_ENDIAN);
 884     proto_tree_add_item(sbas_l1_mt1_tree, hf_sbas_l1_mt1_prn_mask_spare_2, tvb, 20, 8, ENC_BIG_ENDIAN);
 885     proto_tree_add_item(sbas_l1_mt1_tree, hf_sbas_l1_mt1_iodp,             tvb, 27, 1, ENC_NA);
 886
 887     return tvb_captured_length(tvb);
 888 }
 889
 890 /* Dissect SBAS L1 MT 2 */
 891 static int dissect_sbas_l1_mt2(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void *data _U_) {
 892     col_set_str(pinfo->cinfo, COL_PROTOCOL, "SBAS L1 MT2");
 893     col_clear(pinfo->cinfo, COL_INFO);
 894
 895     proto_item *ti = proto_tree_add_item(tree, hf_sbas_l1_mt2, tvb, 0, 32, ENC_NA);
 896     proto_tree *sbas_l1_mt2_tree = proto_item_add_subtree(ti, ett_sbas_l1_mt2);
 897
 898     proto_tree_add_item(sbas_l1_mt2_tree, hf_sbas_l1_mt2_iodf_2,   tvb, 0,  1, ENC_NA);
 899     proto_tree_add_item(sbas_l1_mt2_tree, hf_sbas_l1_mt2_iodp,     tvb, 1,  1, ENC_NA);
 900     proto_tree_add_item(sbas_l1_mt2_tree, hf_sbas_l1_mt2_fc_1,     tvb, 1,  4, ENC_BIG_ENDIAN);
 901     proto_tree_add_item(sbas_l1_mt2_tree, hf_sbas_l1_mt2_fc_2,     tvb, 2,  4, ENC_BIG_ENDIAN);
 902     proto_tree_add_item(sbas_l1_mt2_tree, hf_sbas_l1_mt2_fc_3,     tvb, 4,  4, ENC_BIG_ENDIAN);
 903     proto_tree_add_item(sbas_l1_mt2_tree, hf_sbas_l1_mt2_fc_4,     tvb, 5,  4, ENC_BIG_ENDIAN);
 904     proto_tree_add_item(sbas_l1_mt2_tree, hf_sbas_l1_mt2_fc_5,     tvb, 7,  4, ENC_BIG_ENDIAN);
 905     proto_tree_add_item(sbas_l1_mt2_tree, hf_sbas_l1_mt2_fc_6,     tvb, 8,  4, ENC_BIG_ENDIAN);
 906     proto_tree_add_item(sbas_l1_mt2_tree, hf_sbas_l1_mt2_fc_7,     tvb, 10, 4, ENC_BIG_ENDIAN);
 907     proto_tree_add_item(sbas_l1_mt2_tree, hf_sbas_l1_mt2_fc_8,     tvb, 11, 4, ENC_BIG_ENDIAN);
 908     proto_tree_add_item(sbas_l1_mt2_tree, hf_sbas_l1_mt2_fc_9,     tvb, 13, 4, ENC_BIG_ENDIAN);
 909     proto_tree_add_item(sbas_l1_mt2_tree, hf_sbas_l1_mt2_fc_10,    tvb, 14, 4, ENC_BIG_ENDIAN);
 910     proto_tree_add_item(sbas_l1_mt2_tree, hf_sbas_l1_mt2_fc_11,    tvb, 16, 4, ENC_BIG_ENDIAN);
 911     proto_tree_add_item(sbas_l1_mt2_tree, hf_sbas_l1_mt2_fc_12,    tvb, 17, 4, ENC_BIG_ENDIAN);
 912     proto_tree_add_item(sbas_l1_mt2_tree, hf_sbas_l1_mt2_fc_13,    tvb, 19, 4, ENC_BIG_ENDIAN);
 913     proto_tree_add_item(sbas_l1_mt2_tree, hf_sbas_l1_mt2_udrei_1,  tvb, 20, 2, ENC_BIG_ENDIAN);
 914     proto_tree_add_item(sbas_l1_mt2_tree, hf_sbas_l1_mt2_udrei_2,  tvb, 21, 2, ENC_BIG_ENDIAN);
 915     proto_tree_add_item(sbas_l1_mt2_tree, hf_sbas_l1_mt2_udrei_3,  tvb, 21, 2, ENC_BIG_ENDIAN);
 916     proto_tree_add_item(sbas_l1_mt2_tree, hf_sbas_l1_mt2_udrei_4,  tvb, 22, 2, ENC_BIG_ENDIAN);
 917     proto_tree_add_item(sbas_l1_mt2_tree, hf_sbas_l1_mt2_udrei_5,  tvb, 22, 2, ENC_BIG_ENDIAN);
 918     proto_tree_add_item(sbas_l1_mt2_tree, hf_sbas_l1_mt2_udrei_6,  tvb, 23, 2, ENC_BIG_ENDIAN);
 919     proto_tree_add_item(sbas_l1_mt2_tree, hf_sbas_l1_mt2_udrei_7,  tvb, 23, 2, ENC_BIG_ENDIAN);
 920     proto_tree_add_item(sbas_l1_mt2_tree, hf_sbas_l1_mt2_udrei_8,  tvb, 24, 2, ENC_BIG_ENDIAN);
 921     proto_tree_add_item(sbas_l1_mt2_tree, hf_sbas_l1_mt2_udrei_9,  tvb, 24, 2, ENC_BIG_ENDIAN);
 922     proto_tree_add_item(sbas_l1_mt2_tree, hf_sbas_l1_mt2_udrei_10, tvb, 25, 2, ENC_BIG_ENDIAN);
 923     proto_tree_add_item(sbas_l1_mt2_tree, hf_sbas_l1_mt2_udrei_11, tvb, 25, 2, ENC_BIG_ENDIAN);
 924     proto_tree_add_item(sbas_l1_mt2_tree, hf_sbas_l1_mt2_udrei_12, tvb, 26, 2, ENC_BIG_ENDIAN);
 925     proto_tree_add_item(sbas_l1_mt2_tree, hf_sbas_l1_mt2_udrei_13, tvb, 26, 2, ENC_BIG_ENDIAN);
 926
 927     return tvb_captured_length(tvb);
 928 }
 929
 930 /* Dissect SBAS L1 MT 3 */
 931 static int dissect_sbas_l1_mt3(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void *data _U_) {
 932     col_set_str(pinfo->cinfo, COL_PROTOCOL, "SBAS L1 MT3");
 933     col_clear(pinfo->cinfo, COL_INFO);
 934
 935     proto_item *ti = proto_tree_add_item(tree, hf_sbas_l1_mt3, tvb, 0, 32, ENC_NA);
 936     proto_tree *sbas_l1_mt3_tree = proto_item_add_subtree(ti, ett_sbas_l1_mt3);
 937
 938     proto_tree_add_item(sbas_l1_mt3_tree, hf_sbas_l1_mt3_iodf_3,   tvb, 0,  1, ENC_NA);
 939     proto_tree_add_item(sbas_l1_mt3_tree, hf_sbas_l1_mt3_iodp,     tvb, 1,  1, ENC_NA);
 940     proto_tree_add_item(sbas_l1_mt3_tree, hf_sbas_l1_mt3_fc_14,    tvb, 1,  4, ENC_BIG_ENDIAN);
 941     proto_tree_add_item(sbas_l1_mt3_tree, hf_sbas_l1_mt3_fc_15,    tvb, 2,  4, ENC_BIG_ENDIAN);
 942     proto_tree_add_item(sbas_l1_mt3_tree, hf_sbas_l1_mt3_fc_16,    tvb, 4,  4, ENC_BIG_ENDIAN);
 943     proto_tree_add_item(sbas_l1_mt3_tree, hf_sbas_l1_mt3_fc_17,    tvb, 5,  4, ENC_BIG_ENDIAN);
 944     proto_tree_add_item(sbas_l1_mt3_tree, hf_sbas_l1_mt3_fc_18,    tvb, 7,  4, ENC_BIG_ENDIAN);
 945     proto_tree_add_item(sbas_l1_mt3_tree, hf_sbas_l1_mt3_fc_19,    tvb, 8,  4, ENC_BIG_ENDIAN);
 946     proto_tree_add_item(sbas_l1_mt3_tree, hf_sbas_l1_mt3_fc_20,    tvb, 10, 4, ENC_BIG_ENDIAN);
 947     proto_tree_add_item(sbas_l1_mt3_tree, hf_sbas_l1_mt3_fc_21,    tvb, 11, 4, ENC_BIG_ENDIAN);
 948     proto_tree_add_item(sbas_l1_mt3_tree, hf_sbas_l1_mt3_fc_22,    tvb, 13, 4, ENC_BIG_ENDIAN);
 949     proto_tree_add_item(sbas_l1_mt3_tree, hf_sbas_l1_mt3_fc_23,    tvb, 14, 4, ENC_BIG_ENDIAN);
 950     proto_tree_add_item(sbas_l1_mt3_tree, hf_sbas_l1_mt3_fc_24,    tvb, 16, 4, ENC_BIG_ENDIAN);
 951     proto_tree_add_item(sbas_l1_mt3_tree, hf_sbas_l1_mt3_fc_25,    tvb, 17, 4, ENC_BIG_ENDIAN);
 952     proto_tree_add_item(sbas_l1_mt3_tree, hf_sbas_l1_mt3_fc_26,    tvb, 19, 4, ENC_BIG_ENDIAN);
 953     proto_tree_add_item(sbas_l1_mt3_tree, hf_sbas_l1_mt3_udrei_14, tvb, 20, 2, ENC_BIG_ENDIAN);
 954     proto_tree_add_item(sbas_l1_mt3_tree, hf_sbas_l1_mt3_udrei_15, tvb, 21, 2, ENC_BIG_ENDIAN);
 955     proto_tree_add_item(sbas_l1_mt3_tree, hf_sbas_l1_mt3_udrei_16, tvb, 21, 2, ENC_BIG_ENDIAN);
 956     proto_tree_add_item(sbas_l1_mt3_tree, hf_sbas_l1_mt3_udrei_17, tvb, 22, 2, ENC_BIG_ENDIAN);
 957     proto_tree_add_item(sbas_l1_mt3_tree, hf_sbas_l1_mt3_udrei_18, tvb, 22, 2, ENC_BIG_ENDIAN);
 958     proto_tree_add_item(sbas_l1_mt3_tree, hf_sbas_l1_mt3_udrei_19, tvb, 23, 2, ENC_BIG_ENDIAN);
 959     proto_tree_add_item(sbas_l1_mt3_tree, hf_sbas_l1_mt3_udrei_20, tvb, 23, 2, ENC_BIG_ENDIAN);
 960     proto_tree_add_item(sbas_l1_mt3_tree, hf_sbas_l1_mt3_udrei_21, tvb, 24, 2, ENC_BIG_ENDIAN);
 961     proto_tree_add_item(sbas_l1_mt3_tree, hf_sbas_l1_mt3_udrei_22, tvb, 24, 2, ENC_BIG_ENDIAN);
 962     proto_tree_add_item(sbas_l1_mt3_tree, hf_sbas_l1_mt3_udrei_23, tvb, 25, 2, ENC_BIG_ENDIAN);
 963     proto_tree_add_item(sbas_l1_mt3_tree, hf_sbas_l1_mt3_udrei_24, tvb, 25, 2, ENC_BIG_ENDIAN);
 964     proto_tree_add_item(sbas_l1_mt3_tree, hf_sbas_l1_mt3_udrei_25, tvb, 26, 2, ENC_BIG_ENDIAN);
 965     proto_tree_add_item(sbas_l1_mt3_tree, hf_sbas_l1_mt3_udrei_26, tvb, 26, 2, ENC_BIG_ENDIAN);
 966
 967     return tvb_captured_length(tvb);
 968 }
 969
 970 /* Dissect SBAS L1 MT 4 */
 971 static int dissect_sbas_l1_mt4(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void *data _U_) {
 972     col_set_str(pinfo->cinfo, COL_PROTOCOL, "SBAS L1 MT4");
 973     col_clear(pinfo->cinfo, COL_INFO);
 974
 975     proto_item *ti = proto_tree_add_item(tree, hf_sbas_l1_mt4, tvb, 0, 32, ENC_NA);
 976     proto_tree *sbas_l1_mt4_tree = proto_item_add_subtree(ti, ett_sbas_l1_mt4);
 977
 978     proto_tree_add_item(sbas_l1_mt4_tree, hf_sbas_l1_mt4_iodf_4,   tvb, 0,  1, ENC_NA);
 979     proto_tree_add_item(sbas_l1_mt4_tree, hf_sbas_l1_mt4_iodp,     tvb, 1,  1, ENC_NA);
 980     proto_tree_add_item(sbas_l1_mt4_tree, hf_sbas_l1_mt4_fc_27,    tvb, 1,  4, ENC_BIG_ENDIAN);
 981     proto_tree_add_item(sbas_l1_mt4_tree, hf_sbas_l1_mt4_fc_28,    tvb, 2,  4, ENC_BIG_ENDIAN);
 982     proto_tree_add_item(sbas_l1_mt4_tree, hf_sbas_l1_mt4_fc_29,    tvb, 4,  4, ENC_BIG_ENDIAN);
 983     proto_tree_add_item(sbas_l1_mt4_tree, hf_sbas_l1_mt4_fc_30,    tvb, 5,  4, ENC_BIG_ENDIAN);
 984     proto_tree_add_item(sbas_l1_mt4_tree, hf_sbas_l1_mt4_fc_31,    tvb, 7,  4, ENC_BIG_ENDIAN);
 985     proto_tree_add_item(sbas_l1_mt4_tree, hf_sbas_l1_mt4_fc_32,    tvb, 8,  4, ENC_BIG_ENDIAN);
 986     proto_tree_add_item(sbas_l1_mt4_tree, hf_sbas_l1_mt4_fc_33,    tvb, 10, 4, ENC_BIG_ENDIAN);
 987     proto_tree_add_item(sbas_l1_mt4_tree, hf_sbas_l1_mt4_fc_34,    tvb, 11, 4, ENC_BIG_ENDIAN);
 988     proto_tree_add_item(sbas_l1_mt4_tree, hf_sbas_l1_mt4_fc_35,    tvb, 13, 4, ENC_BIG_ENDIAN);
 989     proto_tree_add_item(sbas_l1_mt4_tree, hf_sbas_l1_mt4_fc_36,    tvb, 14, 4, ENC_BIG_ENDIAN);
 990     proto_tree_add_item(sbas_l1_mt4_tree, hf_sbas_l1_mt4_fc_37,    tvb, 16, 4, ENC_BIG_ENDIAN);
 991     proto_tree_add_item(sbas_l1_mt4_tree, hf_sbas_l1_mt4_fc_38,    tvb, 17, 4, ENC_BIG_ENDIAN);
 992     proto_tree_add_item(sbas_l1_mt4_tree, hf_sbas_l1_mt4_fc_39,    tvb, 19, 4, ENC_BIG_ENDIAN);
 993     proto_tree_add_item(sbas_l1_mt4_tree, hf_sbas_l1_mt4_udrei_27, tvb, 20, 2, ENC_BIG_ENDIAN);
 994     proto_tree_add_item(sbas_l1_mt4_tree, hf_sbas_l1_mt4_udrei_28, tvb, 21, 2, ENC_BIG_ENDIAN);
 995     proto_tree_add_item(sbas_l1_mt4_tree, hf_sbas_l1_mt4_udrei_29, tvb, 21, 2, ENC_BIG_ENDIAN);
 996     proto_tree_add_item(sbas_l1_mt4_tree, hf_sbas_l1_mt4_udrei_30, tvb, 22, 2, ENC_BIG_ENDIAN);
 997     proto_tree_add_item(sbas_l1_mt4_tree, hf_sbas_l1_mt4_udrei_31, tvb, 22, 2, ENC_BIG_ENDIAN);
 998     proto_tree_add_item(sbas_l1_mt4_tree, hf_sbas_l1_mt4_udrei_32, tvb, 23, 2, ENC_BIG_ENDIAN);
 999     proto_tree_add_item(sbas_l1_mt4_tree, hf_sbas_l1_mt4_udrei_33, tvb, 23, 2, ENC_BIG_ENDIAN);
1000     proto_tree_add_item(sbas_l1_mt4_tree, hf_sbas_l1_mt4_udrei_34, tvb, 24, 2, ENC_BIG_ENDIAN);
1001     proto_tree_add_item(sbas_l1_mt4_tree, hf_sbas_l1_mt4_udrei_35, tvb, 24, 2, ENC_BIG_ENDIAN);
1002     proto_tree_add_item(sbas_l1_mt4_tree, hf_sbas_l1_mt4_udrei_36, tvb, 25, 2, ENC_BIG_ENDIAN);
1003     proto_tree_add_item(sbas_l1_mt4_tree, hf_sbas_l1_mt4_udrei_37, tvb, 25, 2, ENC_BIG_ENDIAN);
1004     proto_tree_add_item(sbas_l1_mt4_tree, hf_sbas_l1_mt4_udrei_38, tvb, 26, 2, ENC_BIG_ENDIAN);
1005     proto_tree_add_item(sbas_l1_mt4_tree, hf_sbas_l1_mt4_udrei_39, tvb, 26, 2, ENC_BIG_ENDIAN);
1006
1007     return tvb_captured_length(tvb);
1008 }
1009
1010 /* Dissect SBAS L1 MT 5 */
1011 static int dissect_sbas_l1_mt5(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void *data _U_) {
1012     col_set_str(pinfo->cinfo, COL_PROTOCOL, "SBAS L1 MT5");
1013     col_clear(pinfo->cinfo, COL_INFO);
1014
1015     proto_item *ti = proto_tree_add_item(tree, hf_sbas_l1_mt5, tvb, 0, 32, ENC_NA);
1016     proto_tree *sbas_l1_mt5_tree = proto_item_add_subtree(ti, ett_sbas_l1_mt5);
1017
1018     proto_tree_add_item(sbas_l1_mt5_tree, hf_sbas_l1_mt5_iodf_5,   tvb, 0,  1, ENC_NA);
1019     proto_tree_add_item(sbas_l1_mt5_tree, hf_sbas_l1_mt5_iodp,     tvb, 1,  1, ENC_NA);
1020     proto_tree_add_item(sbas_l1_mt5_tree, hf_sbas_l1_mt5_fc_40,    tvb, 1,  4, ENC_BIG_ENDIAN);
1021     proto_tree_add_item(sbas_l1_mt5_tree, hf_sbas_l1_mt5_fc_41,    tvb, 2,  4, ENC_BIG_ENDIAN);
1022     proto_tree_add_item(sbas_l1_mt5_tree, hf_sbas_l1_mt5_fc_42,    tvb, 4,  4, ENC_BIG_ENDIAN);
1023     proto_tree_add_item(sbas_l1_mt5_tree, hf_sbas_l1_mt5_fc_43,    tvb, 5,  4, ENC_BIG_ENDIAN);
1024     proto_tree_add_item(sbas_l1_mt5_tree, hf_sbas_l1_mt5_fc_44,    tvb, 7,  4, ENC_BIG_ENDIAN);
1025     proto_tree_add_item(sbas_l1_mt5_tree, hf_sbas_l1_mt5_fc_45,    tvb, 8,  4, ENC_BIG_ENDIAN);
1026     proto_tree_add_item(sbas_l1_mt5_tree, hf_sbas_l1_mt5_fc_46,    tvb, 10, 4, ENC_BIG_ENDIAN);
1027     proto_tree_add_item(sbas_l1_mt5_tree, hf_sbas_l1_mt5_fc_47,    tvb, 11, 4, ENC_BIG_ENDIAN);
1028     proto_tree_add_item(sbas_l1_mt5_tree, hf_sbas_l1_mt5_fc_48,    tvb, 13, 4, ENC_BIG_ENDIAN);
1029     proto_tree_add_item(sbas_l1_mt5_tree, hf_sbas_l1_mt5_fc_49,    tvb, 14, 4, ENC_BIG_ENDIAN);
1030     proto_tree_add_item(sbas_l1_mt5_tree, hf_sbas_l1_mt5_fc_50,    tvb, 16, 4, ENC_BIG_ENDIAN);
1031     proto_tree_add_item(sbas_l1_mt5_tree, hf_sbas_l1_mt5_fc_51,    tvb, 17, 4, ENC_BIG_ENDIAN);
1032     proto_tree_add_item(sbas_l1_mt5_tree, hf_sbas_l1_mt5_fc_52,    tvb, 19, 4, ENC_BIG_ENDIAN);
1033     proto_tree_add_item(sbas_l1_mt5_tree, hf_sbas_l1_mt5_udrei_40, tvb, 20, 2, ENC_BIG_ENDIAN);
1034     proto_tree_add_item(sbas_l1_mt5_tree, hf_sbas_l1_mt5_udrei_41, tvb, 21, 2, ENC_BIG_ENDIAN);
1035     proto_tree_add_item(sbas_l1_mt5_tree, hf_sbas_l1_mt5_udrei_42, tvb, 21, 2, ENC_BIG_ENDIAN);
1036     proto_tree_add_item(sbas_l1_mt5_tree, hf_sbas_l1_mt5_udrei_43, tvb, 22, 2, ENC_BIG_ENDIAN);
1037     proto_tree_add_item(sbas_l1_mt5_tree, hf_sbas_l1_mt5_udrei_44, tvb, 22, 2, ENC_BIG_ENDIAN);
1038     proto_tree_add_item(sbas_l1_mt5_tree, hf_sbas_l1_mt5_udrei_45, tvb, 23, 2, ENC_BIG_ENDIAN);
1039     proto_tree_add_item(sbas_l1_mt5_tree, hf_sbas_l1_mt5_udrei_46, tvb, 23, 2, ENC_BIG_ENDIAN);
1040     proto_tree_add_item(sbas_l1_mt5_tree, hf_sbas_l1_mt5_udrei_47, tvb, 24, 2, ENC_BIG_ENDIAN);
1041     proto_tree_add_item(sbas_l1_mt5_tree, hf_sbas_l1_mt5_udrei_48, tvb, 24, 2, ENC_BIG_ENDIAN);
1042     proto_tree_add_item(sbas_l1_mt5_tree, hf_sbas_l1_mt5_udrei_49, tvb, 25, 2, ENC_BIG_ENDIAN);
1043     proto_tree_add_item(sbas_l1_mt5_tree, hf_sbas_l1_mt5_udrei_50, tvb, 25, 2, ENC_BIG_ENDIAN);
1044     proto_tree_add_item(sbas_l1_mt5_tree, hf_sbas_l1_mt5_udrei_51, tvb, 26, 2, ENC_BIG_ENDIAN);
1045     proto_tree_add_item(sbas_l1_mt5_tree, hf_sbas_l1_mt5_udrei_52, tvb, 26, 2, ENC_BIG_ENDIAN);
1046
1047     return tvb_captured_length(tvb);
1048 }
1049
1050 /* Dissect SBAS L1 MT 6 */
1051 static int dissect_sbas_l1_mt6(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void *data _U_) {
1052     col_set_str(pinfo->cinfo, COL_PROTOCOL, "SBAS L1 MT6");
1053     col_clear(pinfo->cinfo, COL_INFO);
1054
1055     proto_item *ti = proto_tree_add_item(tree, hf_sbas_l1_mt6, tvb, 0, 32, ENC_NA);
1056     proto_tree *sbas_l1_mt6_tree = proto_item_add_subtree(ti, ett_sbas_l1_mt6);
1057
1058     // IODF_2 to IODF_5
1059     proto_tree_add_item(sbas_l1_mt6_tree, hf_sbas_l1_mt6_iodf_2, tvb, 0, 1, ENC_NA);
1060     proto_tree_add_item(sbas_l1_mt6_tree, hf_sbas_l1_mt6_iodf_3, tvb, 1, 1, ENC_NA);
1061     proto_tree_add_item(sbas_l1_mt6_tree, hf_sbas_l1_mt6_iodf_4, tvb, 1, 1, ENC_NA);
1062     proto_tree_add_item(sbas_l1_mt6_tree, hf_sbas_l1_mt6_iodf_5, tvb, 1, 1, ENC_NA);
1063
1064     // UDREI_i
1065     proto_tree_add_item(sbas_l1_mt6_tree, hf_sbas_l1_mt6_udrei_1,  tvb, 1,  2, ENC_BIG_ENDIAN);
1066     proto_tree_add_item(sbas_l1_mt6_tree, hf_sbas_l1_mt6_udrei_2,  tvb, 2,  2, ENC_BIG_ENDIAN);
1067     proto_tree_add_item(sbas_l1_mt6_tree, hf_sbas_l1_mt6_udrei_3,  tvb, 2,  2, ENC_BIG_ENDIAN);
1068     proto_tree_add_item(sbas_l1_mt6_tree, hf_sbas_l1_mt6_udrei_4,  tvb, 3,  2, ENC_BIG_ENDIAN);
1069     proto_tree_add_item(sbas_l1_mt6_tree, hf_sbas_l1_mt6_udrei_5,  tvb, 3,  2, ENC_BIG_ENDIAN);
1070     proto_tree_add_item(sbas_l1_mt6_tree, hf_sbas_l1_mt6_udrei_6,  tvb, 4,  2, ENC_BIG_ENDIAN);
1071     proto_tree_add_item(sbas_l1_mt6_tree, hf_sbas_l1_mt6_udrei_7,  tvb, 4,  2, ENC_BIG_ENDIAN);
1072     proto_tree_add_item(sbas_l1_mt6_tree, hf_sbas_l1_mt6_udrei_8,  tvb, 5,  2, ENC_BIG_ENDIAN);
1073     proto_tree_add_item(sbas_l1_mt6_tree, hf_sbas_l1_mt6_udrei_9,  tvb, 5,  2, ENC_BIG_ENDIAN);
1074     proto_tree_add_item(sbas_l1_mt6_tree, hf_sbas_l1_mt6_udrei_10, tvb, 6,  2, ENC_BIG_ENDIAN);
1075     proto_tree_add_item(sbas_l1_mt6_tree, hf_sbas_l1_mt6_udrei_11, tvb, 6,  2, ENC_BIG_ENDIAN);
1076     proto_tree_add_item(sbas_l1_mt6_tree, hf_sbas_l1_mt6_udrei_12, tvb, 7,  2, ENC_BIG_ENDIAN);
1077     proto_tree_add_item(sbas_l1_mt6_tree, hf_sbas_l1_mt6_udrei_13, tvb, 7,  2, ENC_BIG_ENDIAN);
1078     proto_tree_add_item(sbas_l1_mt6_tree, hf_sbas_l1_mt6_udrei_14, tvb, 8,  2, ENC_BIG_ENDIAN);
1079     proto_tree_add_item(sbas_l1_mt6_tree, hf_sbas_l1_mt6_udrei_15, tvb, 8,  2, ENC_BIG_ENDIAN);
1080     proto_tree_add_item(sbas_l1_mt6_tree, hf_sbas_l1_mt6_udrei_16, tvb, 9,  2, ENC_BIG_ENDIAN);
1081     proto_tree_add_item(sbas_l1_mt6_tree, hf_sbas_l1_mt6_udrei_17, tvb, 9,  2, ENC_BIG_ENDIAN);
1082     proto_tree_add_item(sbas_l1_mt6_tree, hf_sbas_l1_mt6_udrei_18, tvb, 10, 2, ENC_BIG_ENDIAN);
1083     proto_tree_add_item(sbas_l1_mt6_tree, hf_sbas_l1_mt6_udrei_19, tvb, 10, 2, ENC_BIG_ENDIAN);
1084     proto_tree_add_item(sbas_l1_mt6_tree, hf_sbas_l1_mt6_udrei_20, tvb, 11, 2, ENC_BIG_ENDIAN);
1085     proto_tree_add_item(sbas_l1_mt6_tree, hf_sbas_l1_mt6_udrei_21, tvb, 11, 2, ENC_BIG_ENDIAN);
1086     proto_tree_add_item(sbas_l1_mt6_tree, hf_sbas_l1_mt6_udrei_22, tvb, 12, 2, ENC_BIG_ENDIAN);
1087     proto_tree_add_item(sbas_l1_mt6_tree, hf_sbas_l1_mt6_udrei_23, tvb, 12, 2, ENC_BIG_ENDIAN);
1088     proto_tree_add_item(sbas_l1_mt6_tree, hf_sbas_l1_mt6_udrei_24, tvb, 13, 2, ENC_BIG_ENDIAN);
1089     proto_tree_add_item(sbas_l1_mt6_tree, hf_sbas_l1_mt6_udrei_25, tvb, 13, 2, ENC_BIG_ENDIAN);
1090     proto_tree_add_item(sbas_l1_mt6_tree, hf_sbas_l1_mt6_udrei_26, tvb, 14, 2, ENC_BIG_ENDIAN);
1091     proto_tree_add_item(sbas_l1_mt6_tree, hf_sbas_l1_mt6_udrei_27, tvb, 14, 2, ENC_BIG_ENDIAN);
1092     proto_tree_add_item(sbas_l1_mt6_tree, hf_sbas_l1_mt6_udrei_28, tvb, 15, 2, ENC_BIG_ENDIAN);
1093     proto_tree_add_item(sbas_l1_mt6_tree, hf_sbas_l1_mt6_udrei_29, tvb, 15, 2, ENC_BIG_ENDIAN);
1094     proto_tree_add_item(sbas_l1_mt6_tree, hf_sbas_l1_mt6_udrei_30, tvb, 16, 2, ENC_BIG_ENDIAN);
1095     proto_tree_add_item(sbas_l1_mt6_tree, hf_sbas_l1_mt6_udrei_31, tvb, 16, 2, ENC_BIG_ENDIAN);
1096     proto_tree_add_item(sbas_l1_mt6_tree, hf_sbas_l1_mt6_udrei_32, tvb, 17, 2, ENC_BIG_ENDIAN);
1097     proto_tree_add_item(sbas_l1_mt6_tree, hf_sbas_l1_mt6_udrei_33, tvb, 17, 2, ENC_BIG_ENDIAN);
1098     proto_tree_add_item(sbas_l1_mt6_tree, hf_sbas_l1_mt6_udrei_34, tvb, 18, 2, ENC_BIG_ENDIAN);
1099     proto_tree_add_item(sbas_l1_mt6_tree, hf_sbas_l1_mt6_udrei_35, tvb, 18, 2, ENC_BIG_ENDIAN);
1100     proto_tree_add_item(sbas_l1_mt6_tree, hf_sbas_l1_mt6_udrei_36, tvb, 19, 2, ENC_BIG_ENDIAN);
1101     proto_tree_add_item(sbas_l1_mt6_tree, hf_sbas_l1_mt6_udrei_37, tvb, 19, 2, ENC_BIG_ENDIAN);
1102     proto_tree_add_item(sbas_l1_mt6_tree, hf_sbas_l1_mt6_udrei_38, tvb, 20, 2, ENC_BIG_ENDIAN);
1103     proto_tree_add_item(sbas_l1_mt6_tree, hf_sbas_l1_mt6_udrei_39, tvb, 20, 2, ENC_BIG_ENDIAN);
1104     proto_tree_add_item(sbas_l1_mt6_tree, hf_sbas_l1_mt6_udrei_40, tvb, 21, 2, ENC_BIG_ENDIAN);
1105     proto_tree_add_item(sbas_l1_mt6_tree, hf_sbas_l1_mt6_udrei_41, tvb, 21, 2, ENC_BIG_ENDIAN);
1106     proto_tree_add_item(sbas_l1_mt6_tree, hf_sbas_l1_mt6_udrei_42, tvb, 22, 2, ENC_BIG_ENDIAN);
1107     proto_tree_add_item(sbas_l1_mt6_tree, hf_sbas_l1_mt6_udrei_43, tvb, 22, 2, ENC_BIG_ENDIAN);
1108     proto_tree_add_item(sbas_l1_mt6_tree, hf_sbas_l1_mt6_udrei_44, tvb, 23, 2, ENC_BIG_ENDIAN);
1109     proto_tree_add_item(sbas_l1_mt6_tree, hf_sbas_l1_mt6_udrei_45, tvb, 23, 2, ENC_BIG_ENDIAN);
1110     proto_tree_add_item(sbas_l1_mt6_tree, hf_sbas_l1_mt6_udrei_46, tvb, 24, 2, ENC_BIG_ENDIAN);
1111     proto_tree_add_item(sbas_l1_mt6_tree, hf_sbas_l1_mt6_udrei_47, tvb, 24, 2, ENC_BIG_ENDIAN);
1112     proto_tree_add_item(sbas_l1_mt6_tree, hf_sbas_l1_mt6_udrei_48, tvb, 25, 2, ENC_BIG_ENDIAN);
1113     proto_tree_add_item(sbas_l1_mt6_tree, hf_sbas_l1_mt6_udrei_49, tvb, 25, 2, ENC_BIG_ENDIAN);
1114     proto_tree_add_item(sbas_l1_mt6_tree, hf_sbas_l1_mt6_udrei_50, tvb, 26, 2, ENC_BIG_ENDIAN);
1115     proto_tree_add_item(sbas_l1_mt6_tree, hf_sbas_l1_mt6_udrei_51, tvb, 26, 2, ENC_BIG_ENDIAN);
1116
1117     return tvb_captured_length(tvb);
1118 }
1119
1120 /* Dissect SBAS L1 MT 7 */
1121 static int dissect_sbas_l1_mt7(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void *data _U_) {
1122     col_set_str(pinfo->cinfo, COL_PROTOCOL, "SBAS L1 MT7");
1123     col_clear(pinfo->cinfo, COL_INFO);
1124
1125     proto_item *ti = proto_tree_add_item(tree, hf_sbas_l1_mt7, tvb, 0, 32, ENC_NA);
1126     proto_tree *sbas_l1_mt7_tree = proto_item_add_subtree(ti, ett_sbas_l1_mt7);
1127
1128     proto_tree_add_item(sbas_l1_mt7_tree, hf_sbas_l1_mt7_t_lat,  tvb, 0, 2, ENC_BIG_ENDIAN);
1129     proto_tree_add_item(sbas_l1_mt7_tree, hf_sbas_l1_mt7_iodp,   tvb, 1, 1, ENC_NA);
1130     proto_tree_add_item(sbas_l1_mt7_tree, hf_sbas_l1_mt7_spare,  tvb, 1, 1, ENC_NA);
1131
1132     // Degradation factor indicator ai_i
1133     proto_tree_add_item(sbas_l1_mt7_tree, hf_sbas_l1_mt7_ai_1,  tvb, 1,  2, ENC_BIG_ENDIAN);
1134     proto_tree_add_item(sbas_l1_mt7_tree, hf_sbas_l1_mt7_ai_2,  tvb, 2,  2, ENC_BIG_ENDIAN);
1135     proto_tree_add_item(sbas_l1_mt7_tree, hf_sbas_l1_mt7_ai_3,  tvb, 2,  2, ENC_BIG_ENDIAN);
1136     proto_tree_add_item(sbas_l1_mt7_tree, hf_sbas_l1_mt7_ai_4,  tvb, 3,  2, ENC_BIG_ENDIAN);
1137     proto_tree_add_item(sbas_l1_mt7_tree, hf_sbas_l1_mt7_ai_5,  tvb, 3,  2, ENC_BIG_ENDIAN);
1138     proto_tree_add_item(sbas_l1_mt7_tree, hf_sbas_l1_mt7_ai_6,  tvb, 4,  2, ENC_BIG_ENDIAN);
1139     proto_tree_add_item(sbas_l1_mt7_tree, hf_sbas_l1_mt7_ai_7,  tvb, 4,  2, ENC_BIG_ENDIAN);
1140     proto_tree_add_item(sbas_l1_mt7_tree, hf_sbas_l1_mt7_ai_8,  tvb, 5,  2, ENC_BIG_ENDIAN);
1141     proto_tree_add_item(sbas_l1_mt7_tree, hf_sbas_l1_mt7_ai_9,  tvb, 5,  2, ENC_BIG_ENDIAN);
1142     proto_tree_add_item(sbas_l1_mt7_tree, hf_sbas_l1_mt7_ai_10, tvb, 6,  2, ENC_BIG_ENDIAN);
1143     proto_tree_add_item(sbas_l1_mt7_tree, hf_sbas_l1_mt7_ai_11, tvb, 6,  2, ENC_BIG_ENDIAN);
1144     proto_tree_add_item(sbas_l1_mt7_tree, hf_sbas_l1_mt7_ai_12, tvb, 7,  2, ENC_BIG_ENDIAN);
1145     proto_tree_add_item(sbas_l1_mt7_tree, hf_sbas_l1_mt7_ai_13, tvb, 7,  2, ENC_BIG_ENDIAN);
1146     proto_tree_add_item(sbas_l1_mt7_tree, hf_sbas_l1_mt7_ai_14, tvb, 8,  2, ENC_BIG_ENDIAN);
1147     proto_tree_add_item(sbas_l1_mt7_tree, hf_sbas_l1_mt7_ai_15, tvb, 8,  2, ENC_BIG_ENDIAN);
1148     proto_tree_add_item(sbas_l1_mt7_tree, hf_sbas_l1_mt7_ai_16, tvb, 9,  2, ENC_BIG_ENDIAN);
1149     proto_tree_add_item(sbas_l1_mt7_tree, hf_sbas_l1_mt7_ai_17, tvb, 9,  2, ENC_BIG_ENDIAN);
1150     proto_tree_add_item(sbas_l1_mt7_tree, hf_sbas_l1_mt7_ai_18, tvb, 10, 2, ENC_BIG_ENDIAN);
1151     proto_tree_add_item(sbas_l1_mt7_tree, hf_sbas_l1_mt7_ai_19, tvb, 10, 2, ENC_BIG_ENDIAN);
1152     proto_tree_add_item(sbas_l1_mt7_tree, hf_sbas_l1_mt7_ai_20, tvb, 11, 2, ENC_BIG_ENDIAN);
1153     proto_tree_add_item(sbas_l1_mt7_tree, hf_sbas_l1_mt7_ai_21, tvb, 11, 2, ENC_BIG_ENDIAN);
1154     proto_tree_add_item(sbas_l1_mt7_tree, hf_sbas_l1_mt7_ai_22, tvb, 12, 2, ENC_BIG_ENDIAN);
1155     proto_tree_add_item(sbas_l1_mt7_tree, hf_sbas_l1_mt7_ai_23, tvb, 12, 2, ENC_BIG_ENDIAN);
1156     proto_tree_add_item(sbas_l1_mt7_tree, hf_sbas_l1_mt7_ai_24, tvb, 13, 2, ENC_BIG_ENDIAN);
1157     proto_tree_add_item(sbas_l1_mt7_tree, hf_sbas_l1_mt7_ai_25, tvb, 13, 2, ENC_BIG_ENDIAN);
1158     proto_tree_add_item(sbas_l1_mt7_tree, hf_sbas_l1_mt7_ai_26, tvb, 14, 2, ENC_BIG_ENDIAN);
1159     proto_tree_add_item(sbas_l1_mt7_tree, hf_sbas_l1_mt7_ai_27, tvb, 14, 2, ENC_BIG_ENDIAN);
1160     proto_tree_add_item(sbas_l1_mt7_tree, hf_sbas_l1_mt7_ai_28, tvb, 15, 2, ENC_BIG_ENDIAN);
1161     proto_tree_add_item(sbas_l1_mt7_tree, hf_sbas_l1_mt7_ai_29, tvb, 15, 2, ENC_BIG_ENDIAN);
1162     proto_tree_add_item(sbas_l1_mt7_tree, hf_sbas_l1_mt7_ai_30, tvb, 16, 2, ENC_BIG_ENDIAN);
1163     proto_tree_add_item(sbas_l1_mt7_tree, hf_sbas_l1_mt7_ai_31, tvb, 16, 2, ENC_BIG_ENDIAN);
1164     proto_tree_add_item(sbas_l1_mt7_tree, hf_sbas_l1_mt7_ai_32, tvb, 17, 2, ENC_BIG_ENDIAN);
1165     proto_tree_add_item(sbas_l1_mt7_tree, hf_sbas_l1_mt7_ai_33, tvb, 17, 2, ENC_BIG_ENDIAN);
1166     proto_tree_add_item(sbas_l1_mt7_tree, hf_sbas_l1_mt7_ai_34, tvb, 18, 2, ENC_BIG_ENDIAN);
1167     proto_tree_add_item(sbas_l1_mt7_tree, hf_sbas_l1_mt7_ai_35, tvb, 18, 2, ENC_BIG_ENDIAN);
1168     proto_tree_add_item(sbas_l1_mt7_tree, hf_sbas_l1_mt7_ai_36, tvb, 19, 2, ENC_BIG_ENDIAN);
1169     proto_tree_add_item(sbas_l1_mt7_tree, hf_sbas_l1_mt7_ai_37, tvb, 19, 2, ENC_BIG_ENDIAN);
1170     proto_tree_add_item(sbas_l1_mt7_tree, hf_sbas_l1_mt7_ai_38, tvb, 20, 2, ENC_BIG_ENDIAN);
1171     proto_tree_add_item(sbas_l1_mt7_tree, hf_sbas_l1_mt7_ai_39, tvb, 20, 2, ENC_BIG_ENDIAN);
1172     proto_tree_add_item(sbas_l1_mt7_tree, hf_sbas_l1_mt7_ai_40, tvb, 21, 2, ENC_BIG_ENDIAN);
1173     proto_tree_add_item(sbas_l1_mt7_tree, hf_sbas_l1_mt7_ai_41, tvb, 21, 2, ENC_BIG_ENDIAN);
1174     proto_tree_add_item(sbas_l1_mt7_tree, hf_sbas_l1_mt7_ai_42, tvb, 22, 2, ENC_BIG_ENDIAN);
1175     proto_tree_add_item(sbas_l1_mt7_tree, hf_sbas_l1_mt7_ai_43, tvb, 22, 2, ENC_BIG_ENDIAN);
1176     proto_tree_add_item(sbas_l1_mt7_tree, hf_sbas_l1_mt7_ai_44, tvb, 23, 2, ENC_BIG_ENDIAN);
1177     proto_tree_add_item(sbas_l1_mt7_tree, hf_sbas_l1_mt7_ai_45, tvb, 23, 2, ENC_BIG_ENDIAN);
1178     proto_tree_add_item(sbas_l1_mt7_tree, hf_sbas_l1_mt7_ai_46, tvb, 24, 2, ENC_BIG_ENDIAN);
1179     proto_tree_add_item(sbas_l1_mt7_tree, hf_sbas_l1_mt7_ai_47, tvb, 24, 2, ENC_BIG_ENDIAN);
1180     proto_tree_add_item(sbas_l1_mt7_tree, hf_sbas_l1_mt7_ai_48, tvb, 25, 2, ENC_BIG_ENDIAN);
1181     proto_tree_add_item(sbas_l1_mt7_tree, hf_sbas_l1_mt7_ai_49, tvb, 25, 2, ENC_BIG_ENDIAN);
1182     proto_tree_add_item(sbas_l1_mt7_tree, hf_sbas_l1_mt7_ai_50, tvb, 26, 2, ENC_BIG_ENDIAN);
1183     proto_tree_add_item(sbas_l1_mt7_tree, hf_sbas_l1_mt7_ai_51, tvb, 26, 2, ENC_BIG_ENDIAN);
1184
1185     return tvb_captured_length(tvb);
1186 }
1187
1188 /* Dissect SBAS L1 MT 17 */
1189 static int dissect_sbas_l1_mt17(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void *data _U_) {
1190     uint8_t i;
1191     tvbuff_t *prn_tvb;
1192
1193     col_set_str(pinfo->cinfo, COL_PROTOCOL, "SBAS L1 MT17");
1194     col_clear(pinfo->cinfo, COL_INFO);
1195
1196     proto_item *ti = proto_tree_add_item(tree, hf_sbas_l1_mt17, tvb, 0, 32, ENC_NA);
1197     proto_tree *sbas_l1_mt17_tree = proto_item_add_subtree(ti, ett_sbas_l1_mt17);
1198
1199     // dissect data for each of 3 PRNs
1200     for (i = 0; i < 3; i++) {
1201         prn_tvb = tvb_new_octet_aligned(tvb, 6 + i*67, 67);
1202         if (prn_tvb) {
1203             add_new_data_source(pinfo, prn_tvb, "PRN data");
1204
1205             uint16_t prn = (tvb_get_uint16(prn_tvb, 0, ENC_BIG_ENDIAN) >> 6) & 0xff;
1206
1207             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);
1208
1209             proto_tree_add_item(prn_tree, hf_sbas_l1_mt17_reserved, prn_tvb, 0,  1, ENC_NA);
1210             proto_tree_add_item(prn_tree, hf_sbas_l1_mt17_prn,      prn_tvb, 0,  2, ENC_BIG_ENDIAN);
1211
1212             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);
1213
1214             proto_tree_add_item(prn_tree, hf_sbas_l1_mt17_x_ga,     prn_tvb, 2,  4, ENC_BIG_ENDIAN);
1215             proto_tree_add_item(prn_tree, hf_sbas_l1_mt17_y_ga,     prn_tvb, 4,  4, ENC_BIG_ENDIAN);
1216             proto_tree_add_item(prn_tree, hf_sbas_l1_mt17_z_ga,     prn_tvb, 4,  4, ENC_BIG_ENDIAN);
1217             proto_tree_add_item(prn_tree, hf_sbas_l1_mt17_x_ga_vel, prn_tvb, 4,  4, ENC_BIG_ENDIAN);
1218             proto_tree_add_item(prn_tree, hf_sbas_l1_mt17_y_ga_vel, prn_tvb, 4,  4, ENC_BIG_ENDIAN);
1219             proto_tree_add_item(prn_tree, hf_sbas_l1_mt17_z_ga_vel, prn_tvb, 5,  4, ENC_BIG_ENDIAN);
1220         }
1221     }
1222
1223     proto_tree_add_item(sbas_l1_mt17_tree, hf_sbas_l1_mt17_t_a, tvb, 24, 4, ENC_BIG_ENDIAN);
1224
1225     return tvb_captured_length(tvb);
1226 }
1227
1228 /* Dissect SBAS L1 MT 18 */
1229 static int dissect_sbas_l1_mt18(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void *data _U_) {
1230     guint32 band_id;
1231
1232     col_set_str(pinfo->cinfo, COL_PROTOCOL, "SBAS L1 MT18");
1233     col_clear(pinfo->cinfo, COL_INFO);
1234
1235     proto_item *ti = proto_tree_add_item(tree, hf_sbas_l1_mt18, tvb, 0, 32, ENC_NA);
1236     proto_tree *sbas_l1_mt18_tree = proto_item_add_subtree(ti, ett_sbas_l1_mt18);
1237
1238     proto_tree_add_item(sbas_l1_mt18_tree,     hf_sbas_l1_mt18_nr_igp_bands,     tvb,  0, 2, ENC_BIG_ENDIAN);
1239     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);
1240     proto_tree_add_item(sbas_l1_mt18_tree,     hf_sbas_l1_mt18_iodi_k,           tvb,  0, 2, ENC_BIG_ENDIAN);
1241
1242     if (band_id == 0) {
1243         proto_tree_add_item(sbas_l1_mt18_tree, hf_sbas_l1_mt18_igp_mask_180w,    tvb,  2, 8, ENC_BIG_ENDIAN);
1244         proto_tree_add_item(sbas_l1_mt18_tree, hf_sbas_l1_mt18_igp_mask_175w,    tvb,  2, 8, ENC_BIG_ENDIAN);
1245         proto_tree_add_item(sbas_l1_mt18_tree, hf_sbas_l1_mt18_igp_mask_170w,    tvb,  8, 8, ENC_BIG_ENDIAN);
1246         proto_tree_add_item(sbas_l1_mt18_tree, hf_sbas_l1_mt18_igp_mask_165w,    tvb,  8, 8, ENC_BIG_ENDIAN);
1247         proto_tree_add_item(sbas_l1_mt18_tree, hf_sbas_l1_mt18_igp_mask_160w,    tvb, 14, 8, ENC_BIG_ENDIAN);
1248         proto_tree_add_item(sbas_l1_mt18_tree, hf_sbas_l1_mt18_igp_mask_155w,    tvb, 14, 8, ENC_BIG_ENDIAN);
1249         proto_tree_add_item(sbas_l1_mt18_tree, hf_sbas_l1_mt18_igp_mask_150w,    tvb, 20, 8, ENC_BIG_ENDIAN);
1250         proto_tree_add_item(sbas_l1_mt18_tree, hf_sbas_l1_mt18_igp_mask_145w,    tvb, 20, 8, ENC_BIG_ENDIAN);
1251     }
1252     else if (band_id == 1) {
1253         proto_tree_add_item(sbas_l1_mt18_tree, hf_sbas_l1_mt18_igp_mask_140w,    tvb,  2, 8, ENC_BIG_ENDIAN);
1254         proto_tree_add_item(sbas_l1_mt18_tree, hf_sbas_l1_mt18_igp_mask_135w,    tvb,  2, 8, ENC_BIG_ENDIAN);
1255         proto_tree_add_item(sbas_l1_mt18_tree, hf_sbas_l1_mt18_igp_mask_130w,    tvb,  8, 8, ENC_BIG_ENDIAN);
1256         proto_tree_add_item(sbas_l1_mt18_tree, hf_sbas_l1_mt18_igp_mask_125w,    tvb,  8, 8, ENC_BIG_ENDIAN);
1257         proto_tree_add_item(sbas_l1_mt18_tree, hf_sbas_l1_mt18_igp_mask_120w,    tvb, 14, 8, ENC_BIG_ENDIAN);
1258         proto_tree_add_item(sbas_l1_mt18_tree, hf_sbas_l1_mt18_igp_mask_115w,    tvb, 14, 8, ENC_BIG_ENDIAN);
1259         proto_tree_add_item(sbas_l1_mt18_tree, hf_sbas_l1_mt18_igp_mask_110w,    tvb, 20, 8, ENC_BIG_ENDIAN);
1260         proto_tree_add_item(sbas_l1_mt18_tree, hf_sbas_l1_mt18_igp_mask_105w,    tvb, 20, 8, ENC_BIG_ENDIAN);
1261     }
1262     else if (band_id == 2) {
1263         proto_tree_add_item(sbas_l1_mt18_tree, hf_sbas_l1_mt18_igp_mask_100w,    tvb,  2, 8, ENC_BIG_ENDIAN);
1264         proto_tree_add_item(sbas_l1_mt18_tree, hf_sbas_l1_mt18_igp_mask_95w,     tvb,  2, 8, ENC_BIG_ENDIAN);
1265         proto_tree_add_item(sbas_l1_mt18_tree, hf_sbas_l1_mt18_igp_mask_90w,     tvb,  8, 8, ENC_BIG_ENDIAN);
1266         proto_tree_add_item(sbas_l1_mt18_tree, hf_sbas_l1_mt18_igp_mask_85w,     tvb,  8, 8, ENC_BIG_ENDIAN);
1267         proto_tree_add_item(sbas_l1_mt18_tree, hf_sbas_l1_mt18_igp_mask_80w,     tvb, 14, 8, ENC_BIG_ENDIAN);
1268         proto_tree_add_item(sbas_l1_mt18_tree, hf_sbas_l1_mt18_igp_mask_75w,     tvb, 14, 8, ENC_BIG_ENDIAN);
1269         proto_tree_add_item(sbas_l1_mt18_tree, hf_sbas_l1_mt18_igp_mask_70w,     tvb, 20, 8, ENC_BIG_ENDIAN);
1270         proto_tree_add_item(sbas_l1_mt18_tree, hf_sbas_l1_mt18_igp_mask_65w,     tvb, 20, 8, ENC_BIG_ENDIAN);
1271     }
1272     else if (band_id == 3) {
1273         proto_tree_add_item(sbas_l1_mt18_tree, hf_sbas_l1_mt18_igp_mask_60w,     tvb,  2, 8, ENC_BIG_ENDIAN);
1274         proto_tree_add_item(sbas_l1_mt18_tree, hf_sbas_l1_mt18_igp_mask_55w,     tvb,  2, 8, ENC_BIG_ENDIAN);
1275         proto_tree_add_item(sbas_l1_mt18_tree, hf_sbas_l1_mt18_igp_mask_50w,     tvb,  8, 8, ENC_BIG_ENDIAN);
1276         proto_tree_add_item(sbas_l1_mt18_tree, hf_sbas_l1_mt18_igp_mask_45w,     tvb,  8, 8, ENC_BIG_ENDIAN);
1277         proto_tree_add_item(sbas_l1_mt18_tree, hf_sbas_l1_mt18_igp_mask_40w,     tvb, 14, 8, ENC_BIG_ENDIAN);
1278         proto_tree_add_item(sbas_l1_mt18_tree, hf_sbas_l1_mt18_igp_mask_35w,     tvb, 14, 8, ENC_BIG_ENDIAN);
1279         proto_tree_add_item(sbas_l1_mt18_tree, hf_sbas_l1_mt18_igp_mask_30w,     tvb, 20, 8, ENC_BIG_ENDIAN);
1280         proto_tree_add_item(sbas_l1_mt18_tree, hf_sbas_l1_mt18_igp_mask_25w,     tvb, 20, 8, ENC_BIG_ENDIAN);
1281     }
1282     else if (band_id == 4) {
1283         proto_tree_add_item(sbas_l1_mt18_tree, hf_sbas_l1_mt18_igp_mask_20w,     tvb,  2, 8, ENC_BIG_ENDIAN);
1284         proto_tree_add_item(sbas_l1_mt18_tree, hf_sbas_l1_mt18_igp_mask_15w,     tvb,  2, 8, ENC_BIG_ENDIAN);
1285         proto_tree_add_item(sbas_l1_mt18_tree, hf_sbas_l1_mt18_igp_mask_10w,     tvb,  8, 8, ENC_BIG_ENDIAN);
1286         proto_tree_add_item(sbas_l1_mt18_tree, hf_sbas_l1_mt18_igp_mask_5w,      tvb,  8, 8, ENC_BIG_ENDIAN);
1287         proto_tree_add_item(sbas_l1_mt18_tree, hf_sbas_l1_mt18_igp_mask_0,       tvb, 14, 8, ENC_BIG_ENDIAN);
1288         proto_tree_add_item(sbas_l1_mt18_tree, hf_sbas_l1_mt18_igp_mask_5e,      tvb, 14, 8, ENC_BIG_ENDIAN);
1289         proto_tree_add_item(sbas_l1_mt18_tree, hf_sbas_l1_mt18_igp_mask_10e,     tvb, 20, 8, ENC_BIG_ENDIAN);
1290         proto_tree_add_item(sbas_l1_mt18_tree, hf_sbas_l1_mt18_igp_mask_15e,     tvb, 20, 8, ENC_BIG_ENDIAN);
1291     }
1292     else if (band_id == 5) {
1293         proto_tree_add_item(sbas_l1_mt18_tree, hf_sbas_l1_mt18_igp_mask_20e,     tvb,  2, 8, ENC_BIG_ENDIAN);
1294         proto_tree_add_item(sbas_l1_mt18_tree, hf_sbas_l1_mt18_igp_mask_25e,     tvb,  2, 8, ENC_BIG_ENDIAN);
1295         proto_tree_add_item(sbas_l1_mt18_tree, hf_sbas_l1_mt18_igp_mask_30e,     tvb,  8, 8, ENC_BIG_ENDIAN);
1296         proto_tree_add_item(sbas_l1_mt18_tree, hf_sbas_l1_mt18_igp_mask_35e,     tvb,  8, 8, ENC_BIG_ENDIAN);
1297         proto_tree_add_item(sbas_l1_mt18_tree, hf_sbas_l1_mt18_igp_mask_40e,     tvb, 14, 8, ENC_BIG_ENDIAN);
1298         proto_tree_add_item(sbas_l1_mt18_tree, hf_sbas_l1_mt18_igp_mask_45e,     tvb, 14, 8, ENC_BIG_ENDIAN);
1299         proto_tree_add_item(sbas_l1_mt18_tree, hf_sbas_l1_mt18_igp_mask_50e,     tvb, 20, 8, ENC_BIG_ENDIAN);
1300         proto_tree_add_item(sbas_l1_mt18_tree, hf_sbas_l1_mt18_igp_mask_55e,     tvb, 20, 8, ENC_BIG_ENDIAN);
1301     }
1302     else if (band_id == 6) {
1303         proto_tree_add_item(sbas_l1_mt18_tree, hf_sbas_l1_mt18_igp_mask_60e,     tvb,  2, 8, ENC_BIG_ENDIAN);
1304         proto_tree_add_item(sbas_l1_mt18_tree, hf_sbas_l1_mt18_igp_mask_65e,     tvb,  2, 8, ENC_BIG_ENDIAN);
1305         proto_tree_add_item(sbas_l1_mt18_tree, hf_sbas_l1_mt18_igp_mask_70e,     tvb,  8, 8, ENC_BIG_ENDIAN);
1306         proto_tree_add_item(sbas_l1_mt18_tree, hf_sbas_l1_mt18_igp_mask_75e,     tvb,  8, 8, ENC_BIG_ENDIAN);
1307         proto_tree_add_item(sbas_l1_mt18_tree, hf_sbas_l1_mt18_igp_mask_80e,     tvb, 14, 8, ENC_BIG_ENDIAN);
1308         proto_tree_add_item(sbas_l1_mt18_tree, hf_sbas_l1_mt18_igp_mask_85e,     tvb, 14, 8, ENC_BIG_ENDIAN);
1309         proto_tree_add_item(sbas_l1_mt18_tree, hf_sbas_l1_mt18_igp_mask_90e,     tvb, 20, 8, ENC_BIG_ENDIAN);
1310         proto_tree_add_item(sbas_l1_mt18_tree, hf_sbas_l1_mt18_igp_mask_95e,     tvb, 20, 8, ENC_BIG_ENDIAN);
1311     }
1312     else if (band_id == 7) {
1313         proto_tree_add_item(sbas_l1_mt18_tree, hf_sbas_l1_mt18_igp_mask_100e,    tvb,  2, 8, ENC_BIG_ENDIAN);
1314         proto_tree_add_item(sbas_l1_mt18_tree, hf_sbas_l1_mt18_igp_mask_105e,    tvb,  2, 8, ENC_BIG_ENDIAN);
1315         proto_tree_add_item(sbas_l1_mt18_tree, hf_sbas_l1_mt18_igp_mask_110e,    tvb,  8, 8, ENC_BIG_ENDIAN);
1316         proto_tree_add_item(sbas_l1_mt18_tree, hf_sbas_l1_mt18_igp_mask_115e,    tvb,  8, 8, ENC_BIG_ENDIAN);
1317         proto_tree_add_item(sbas_l1_mt18_tree, hf_sbas_l1_mt18_igp_mask_120e,    tvb, 14, 8, ENC_BIG_ENDIAN);
1318         proto_tree_add_item(sbas_l1_mt18_tree, hf_sbas_l1_mt18_igp_mask_125e,    tvb, 14, 8, ENC_BIG_ENDIAN);
1319         proto_tree_add_item(sbas_l1_mt18_tree, hf_sbas_l1_mt18_igp_mask_130e,    tvb, 20, 8, ENC_BIG_ENDIAN);
1320         proto_tree_add_item(sbas_l1_mt18_tree, hf_sbas_l1_mt18_igp_mask_135e,    tvb, 20, 8, ENC_BIG_ENDIAN);
1321     }
1322     else if (band_id == 8) {
1323         proto_tree_add_item(sbas_l1_mt18_tree, hf_sbas_l1_mt18_igp_mask_140e,    tvb,  2, 8, ENC_BIG_ENDIAN);
1324         proto_tree_add_item(sbas_l1_mt18_tree, hf_sbas_l1_mt18_igp_mask_145e,    tvb,  2, 8, ENC_BIG_ENDIAN);
1325         proto_tree_add_item(sbas_l1_mt18_tree, hf_sbas_l1_mt18_igp_mask_150e,    tvb,  8, 8, ENC_BIG_ENDIAN);
1326         proto_tree_add_item(sbas_l1_mt18_tree, hf_sbas_l1_mt18_igp_mask_155e,    tvb,  8, 8, ENC_BIG_ENDIAN);
1327         proto_tree_add_item(sbas_l1_mt18_tree, hf_sbas_l1_mt18_igp_mask_160e,    tvb, 14, 8, ENC_BIG_ENDIAN);
1328         proto_tree_add_item(sbas_l1_mt18_tree, hf_sbas_l1_mt18_igp_mask_165e,    tvb, 14, 8, ENC_BIG_ENDIAN);
1329         proto_tree_add_item(sbas_l1_mt18_tree, hf_sbas_l1_mt18_igp_mask_170e,    tvb, 20, 8, ENC_BIG_ENDIAN);
1330         proto_tree_add_item(sbas_l1_mt18_tree, hf_sbas_l1_mt18_igp_mask_175e,    tvb, 20, 8, ENC_BIG_ENDIAN);
1331     }
1332     else if (band_id == 9) {
1333         proto_tree_add_item(sbas_l1_mt18_tree, hf_sbas_l1_mt18_igp_mask_60n_1,   tvb,  2, 8, ENC_BIG_ENDIAN);
1334         proto_tree_add_item(sbas_l1_mt18_tree, hf_sbas_l1_mt18_igp_mask_60n_2,   tvb,  3, 8, ENC_BIG_ENDIAN);
1335         proto_tree_add_item(sbas_l1_mt18_tree, hf_sbas_l1_mt18_igp_mask_65n,     tvb, 11, 8, ENC_BIG_ENDIAN);
1336         proto_tree_add_item(sbas_l1_mt18_tree, hf_sbas_l1_mt18_igp_mask_70n,     tvb, 12, 8, ENC_BIG_ENDIAN);
1337         proto_tree_add_item(sbas_l1_mt18_tree, hf_sbas_l1_mt18_igp_mask_75n,     tvb, 20, 8, ENC_BIG_ENDIAN);
1338         proto_tree_add_item(sbas_l1_mt18_tree, hf_sbas_l1_mt18_igp_mask_85n,     tvb, 20, 8, ENC_BIG_ENDIAN);
1339     }
1340     else if (band_id == 10) {
1341         proto_tree_add_item(sbas_l1_mt18_tree, hf_sbas_l1_mt18_igp_mask_60s_1,   tvb,  2, 8, ENC_BIG_ENDIAN);
1342         proto_tree_add_item(sbas_l1_mt18_tree, hf_sbas_l1_mt18_igp_mask_60s_2,   tvb,  3, 8, ENC_BIG_ENDIAN);
1343         proto_tree_add_item(sbas_l1_mt18_tree, hf_sbas_l1_mt18_igp_mask_65s,     tvb, 11, 8, ENC_BIG_ENDIAN);
1344         proto_tree_add_item(sbas_l1_mt18_tree, hf_sbas_l1_mt18_igp_mask_70s,     tvb, 12, 8, ENC_BIG_ENDIAN);
1345         proto_tree_add_item(sbas_l1_mt18_tree, hf_sbas_l1_mt18_igp_mask_75s,     tvb, 20, 8, ENC_BIG_ENDIAN);
1346         proto_tree_add_item(sbas_l1_mt18_tree, hf_sbas_l1_mt18_igp_mask_85s,     tvb, 20, 8, ENC_BIG_ENDIAN);
1347     }
1348
1349     proto_tree_add_item(sbas_l1_mt18_tree,     hf_sbas_l1_mt18_spare,            tvb, 27, 1, ENC_NA);
1350
1351     return tvb_captured_length(tvb);
1352 }
1353
1354 /* Dissect SBAS L1 MT 24 */
1355 static int dissect_sbas_l1_mt24(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void *data _U_) {
1356     uint32_t velocity_code;
1357
1358     col_set_str(pinfo->cinfo, COL_PROTOCOL, "SBAS L1 MT24");
1359     col_clear(pinfo->cinfo, COL_INFO);
1360
1361     proto_item *ti = proto_tree_add_item(tree, hf_sbas_l1_mt24, tvb, 0, 32, ENC_NA);
1362     proto_tree *sbas_l1_mt24_tree = proto_item_add_subtree(ti, ett_sbas_l1_mt24);
1363
1364     proto_tree_add_item(sbas_l1_mt24_tree, hf_sbas_l1_mt24_fc_i1,     tvb, 0,  4, ENC_BIG_ENDIAN);
1365     proto_tree_add_item(sbas_l1_mt24_tree, hf_sbas_l1_mt24_fc_i2,     tvb, 2,  4, ENC_BIG_ENDIAN);
1366     proto_tree_add_item(sbas_l1_mt24_tree, hf_sbas_l1_mt24_fc_i3,     tvb, 3,  4, ENC_BIG_ENDIAN);
1367     proto_tree_add_item(sbas_l1_mt24_tree, hf_sbas_l1_mt24_fc_i4,     tvb, 5,  4, ENC_BIG_ENDIAN);
1368     proto_tree_add_item(sbas_l1_mt24_tree, hf_sbas_l1_mt24_fc_i5,     tvb, 6,  4, ENC_BIG_ENDIAN);
1369     proto_tree_add_item(sbas_l1_mt24_tree, hf_sbas_l1_mt24_fc_i6,     tvb, 8,  4, ENC_BIG_ENDIAN);
1370     proto_tree_add_item(sbas_l1_mt24_tree, hf_sbas_l1_mt24_udrei_i1,  tvb, 9,  2, ENC_BIG_ENDIAN);
1371     proto_tree_add_item(sbas_l1_mt24_tree, hf_sbas_l1_mt24_udrei_i2,  tvb, 10, 2, ENC_BIG_ENDIAN);
1372     proto_tree_add_item(sbas_l1_mt24_tree, hf_sbas_l1_mt24_udrei_i3,  tvb, 10, 2, ENC_BIG_ENDIAN);
1373     proto_tree_add_item(sbas_l1_mt24_tree, hf_sbas_l1_mt24_udrei_i4,  tvb, 11, 2, ENC_BIG_ENDIAN);
1374     proto_tree_add_item(sbas_l1_mt24_tree, hf_sbas_l1_mt24_udrei_i5,  tvb, 11, 2, ENC_BIG_ENDIAN);
1375     proto_tree_add_item(sbas_l1_mt24_tree, hf_sbas_l1_mt24_udrei_i6,  tvb, 12, 2, ENC_BIG_ENDIAN);
1376     proto_tree_add_item(sbas_l1_mt24_tree, hf_sbas_l1_mt24_iodp,      tvb, 12, 1, ENC_NA);
1377     proto_tree_add_item(sbas_l1_mt24_tree, hf_sbas_l1_mt24_fc_type,   tvb, 13, 1, ENC_NA);
1378     proto_tree_add_item(sbas_l1_mt24_tree, hf_sbas_l1_mt24_iodf_j,    tvb, 13, 1, ENC_NA);
1379     proto_tree_add_item(sbas_l1_mt24_tree, hf_sbas_l1_mt24_spare,     tvb, 13, 1, ENC_NA);
1380
1381     proto_tree_add_item_ret_uint(sbas_l1_mt24_tree, hf_sbas_l1_mt24_velocity_code, tvb, 14, 1, ENC_NA, &velocity_code);
1382
1383     if (velocity_code == 0) {
1384         proto_tree_add_item(sbas_l1_mt24_tree, hf_sbas_l1_mt24_v0_prn_mask_nr_1, tvb, 14, 1, ENC_NA);
1385         proto_tree_add_item(sbas_l1_mt24_tree, hf_sbas_l1_mt24_v0_iod_1,         tvb, 14, 2, ENC_BIG_ENDIAN);
1386         proto_tree_add_item(sbas_l1_mt24_tree, hf_sbas_l1_mt24_v0_delta_x_1,     tvb, 15, 2, ENC_BIG_ENDIAN);
1387         proto_tree_add_item(sbas_l1_mt24_tree, hf_sbas_l1_mt24_v0_delta_y_1,     tvb, 17, 2, ENC_BIG_ENDIAN);
1388         proto_tree_add_item(sbas_l1_mt24_tree, hf_sbas_l1_mt24_v0_delta_z_1,     tvb, 18, 2, ENC_BIG_ENDIAN);
1389         proto_tree_add_item(sbas_l1_mt24_tree, hf_sbas_l1_mt24_v0_delta_a_1_f0,  tvb, 19, 2, ENC_BIG_ENDIAN);
1390
1391         proto_tree_add_item(sbas_l1_mt24_tree, hf_sbas_l1_mt24_v0_prn_mask_nr_2, tvb, 20, 2, ENC_BIG_ENDIAN);
1392         proto_tree_add_item(sbas_l1_mt24_tree, hf_sbas_l1_mt24_v0_iod_2,         tvb, 21, 2, ENC_BIG_ENDIAN);
1393         proto_tree_add_item(sbas_l1_mt24_tree, hf_sbas_l1_mt24_v0_delta_x_2,     tvb, 22, 2, ENC_BIG_ENDIAN);
1394         proto_tree_add_item(sbas_l1_mt24_tree, hf_sbas_l1_mt24_v0_delta_y_2,     tvb, 23, 2, ENC_BIG_ENDIAN);
1395         proto_tree_add_item(sbas_l1_mt24_tree, hf_sbas_l1_mt24_v0_delta_z_2,     tvb, 24, 2, ENC_BIG_ENDIAN);
1396         proto_tree_add_item(sbas_l1_mt24_tree, hf_sbas_l1_mt24_v0_delta_a_2_f0,  tvb, 25, 2, ENC_BIG_ENDIAN);
1397         proto_tree_add_item(sbas_l1_mt24_tree, hf_sbas_l1_mt24_v0_iodp,          tvb, 26, 2, ENC_BIG_ENDIAN);
1398         proto_tree_add_item(sbas_l1_mt24_tree, hf_sbas_l1_mt24_v0_spare,         tvb, 27, 1, ENC_NA);
1399     }
1400     else {
1401         proto_tree_add_item(sbas_l1_mt24_tree, hf_sbas_l1_mt24_v1_prn_mask_nr, tvb, 14, 1, ENC_NA);
1402         proto_tree_add_item(sbas_l1_mt24_tree, hf_sbas_l1_mt24_v1_iod,         tvb, 14, 2, ENC_BIG_ENDIAN);
1403         proto_tree_add_item(sbas_l1_mt24_tree, hf_sbas_l1_mt24_v1_delta_x,     tvb, 15, 4, ENC_BIG_ENDIAN);
1404         proto_tree_add_item(sbas_l1_mt24_tree, hf_sbas_l1_mt24_v1_delta_y,     tvb, 17, 4, ENC_BIG_ENDIAN);
1405         proto_tree_add_item(sbas_l1_mt24_tree, hf_sbas_l1_mt24_v1_delta_z,     tvb, 18, 4, ENC_BIG_ENDIAN);
1406         proto_tree_add_item(sbas_l1_mt24_tree, hf_sbas_l1_mt24_v1_delta_a_f0,  tvb, 20, 4, ENC_BIG_ENDIAN);
1407         proto_tree_add_item(sbas_l1_mt24_tree, hf_sbas_l1_mt24_v1_delta_x_vel, tvb, 21, 4, ENC_BIG_ENDIAN);
1408         proto_tree_add_item(sbas_l1_mt24_tree, hf_sbas_l1_mt24_v1_delta_y_vel, tvb, 22, 4, ENC_BIG_ENDIAN);
1409         proto_tree_add_item(sbas_l1_mt24_tree, hf_sbas_l1_mt24_v1_delta_z_vel, tvb, 23, 4, ENC_BIG_ENDIAN);
1410         proto_tree_add_item(sbas_l1_mt24_tree, hf_sbas_l1_mt24_v1_delta_a_f1,  tvb, 24, 4, ENC_BIG_ENDIAN);
1411         proto_tree_add_item(sbas_l1_mt24_tree, hf_sbas_l1_mt24_v1_t_lt,        tvb, 25, 2, ENC_BIG_ENDIAN);
1412         proto_tree_add_item(sbas_l1_mt24_tree, hf_sbas_l1_mt24_v1_iodp,        tvb, 27, 1, ENC_NA);
1413     }
1414
1415     return tvb_captured_length(tvb);
1416 }
1417
1418 /* Dissect SBAS L1 MT 25 */
1419 static int dissect_sbas_l1_mt25(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void *data _U_) {
1420     uint32_t velocity_code;
1421
1422     col_set_str(pinfo->cinfo, COL_PROTOCOL, "SBAS L1 MT25");
1423     col_clear(pinfo->cinfo, COL_INFO);
1424
1425     proto_item *ti = proto_tree_add_item(tree, hf_sbas_l1_mt25, tvb, 0, 32, ENC_NA);
1426     proto_tree *sbas_l1_mt25_tree = proto_item_add_subtree(ti, ett_sbas_l1_mt25);
1427
1428     // first half message
1429     proto_tree_add_item_ret_uint(sbas_l1_mt25_tree, hf_sbas_l1_mt25_h1_velocity_code,
1430             tvb, 0, 1, ENC_NA, &velocity_code);
1431     if (velocity_code == 0) {
1432         proto_tree_add_item(sbas_l1_mt25_tree, hf_sbas_l1_mt25_h1_v0_prn_mask_nr_1,
1433                 tvb, 0, 2, ENC_BIG_ENDIAN);
1434         proto_tree_add_item(sbas_l1_mt25_tree, hf_sbas_l1_mt25_h1_v0_iod_1,
1435                 tvb, 1, 2, ENC_BIG_ENDIAN);
1436         proto_tree_add_item(sbas_l1_mt25_tree, hf_sbas_l1_mt25_h1_v0_delta_x_1,
1437                 tvb, 2, 2, ENC_BIG_ENDIAN);
1438         proto_tree_add_item(sbas_l1_mt25_tree, hf_sbas_l1_mt25_h1_v0_delta_y_1,
1439                 tvb, 3, 2, ENC_BIG_ENDIAN);
1440         proto_tree_add_item(sbas_l1_mt25_tree, hf_sbas_l1_mt25_h1_v0_delta_z_1,
1441                 tvb, 4, 2, ENC_BIG_ENDIAN);
1442         proto_tree_add_item(sbas_l1_mt25_tree, hf_sbas_l1_mt25_h1_v0_delta_a_1_f0,
1443                 tvb, 6, 2, ENC_BIG_ENDIAN);
1444
1445         proto_tree_add_item(sbas_l1_mt25_tree, hf_sbas_l1_mt25_h1_v0_prn_mask_nr_2,
1446                 tvb, 7, 1, ENC_NA);
1447         proto_tree_add_item(sbas_l1_mt25_tree, hf_sbas_l1_mt25_h1_v0_iod_2,
1448                 tvb, 8, 1, ENC_NA);
1449         proto_tree_add_item(sbas_l1_mt25_tree, hf_sbas_l1_mt25_h1_v0_delta_x_2,
1450                 tvb, 9, 2, ENC_BIG_ENDIAN);
1451         proto_tree_add_item(sbas_l1_mt25_tree, hf_sbas_l1_mt25_h1_v0_delta_y_2,
1452                 tvb, 10, 2, ENC_BIG_ENDIAN);
1453         proto_tree_add_item(sbas_l1_mt25_tree, hf_sbas_l1_mt25_h1_v0_delta_z_2,
1454                 tvb, 11, 2, ENC_BIG_ENDIAN);
1455         proto_tree_add_item(sbas_l1_mt25_tree, hf_sbas_l1_mt25_h1_v0_delta_a_2_f0,
1456                 tvb, 12, 2, ENC_BIG_ENDIAN);
1457         proto_tree_add_item(sbas_l1_mt25_tree, hf_sbas_l1_mt25_h1_v0_iodp,
1458                 tvb, 13, 1, ENC_NA);
1459         proto_tree_add_item(sbas_l1_mt25_tree, hf_sbas_l1_mt25_h1_v0_spare,
1460                 tvb, 13, 1, ENC_NA);
1461     }
1462     else { // velocity_code == 1
1463         proto_tree_add_item(sbas_l1_mt25_tree, hf_sbas_l1_mt25_h1_v1_prn_mask_nr,
1464                 tvb, 0, 2, ENC_BIG_ENDIAN);
1465         proto_tree_add_item(sbas_l1_mt25_tree, hf_sbas_l1_mt25_h1_v1_iod,
1466                 tvb, 1, 2, ENC_BIG_ENDIAN);
1467         proto_tree_add_item(sbas_l1_mt25_tree, hf_sbas_l1_mt25_h1_v1_delta_x,
1468                 tvb, 2, 4, ENC_BIG_ENDIAN);
1469         proto_tree_add_item(sbas_l1_mt25_tree, hf_sbas_l1_mt25_h1_v1_delta_y,
1470                 tvb, 4, 4, ENC_BIG_ENDIAN);
1471         proto_tree_add_item(sbas_l1_mt25_tree, hf_sbas_l1_mt25_h1_v1_delta_z,
1472                 tvb, 5, 4, ENC_BIG_ENDIAN);
1473         proto_tree_add_item(sbas_l1_mt25_tree, hf_sbas_l1_mt25_h1_v1_delta_a_f0,
1474                 tvb, 6, 4, ENC_BIG_ENDIAN);
1475         proto_tree_add_item(sbas_l1_mt25_tree, hf_sbas_l1_mt25_h1_v1_delta_x_vel,
1476                 tvb, 8, 4, ENC_BIG_ENDIAN);
1477         proto_tree_add_item(sbas_l1_mt25_tree, hf_sbas_l1_mt25_h1_v1_delta_y_vel,
1478                 tvb, 9, 4, ENC_BIG_ENDIAN);
1479         proto_tree_add_item(sbas_l1_mt25_tree, hf_sbas_l1_mt25_h1_v1_delta_z_vel,
1480                 tvb, 10, 4, ENC_BIG_ENDIAN);
1481         proto_tree_add_item(sbas_l1_mt25_tree, hf_sbas_l1_mt25_h1_v1_delta_a_f1,
1482                 tvb, 11, 4, ENC_BIG_ENDIAN);
1483         proto_tree_add_item(sbas_l1_mt25_tree, hf_sbas_l1_mt25_h1_v1_t_lt,
1484                 tvb, 12, 2, ENC_BIG_ENDIAN);
1485         proto_tree_add_item(sbas_l1_mt25_tree, hf_sbas_l1_mt25_h1_v1_iodp,
1486                 tvb, 13, 1, ENC_NA);
1487     }
1488
1489     // second half message
1490     proto_tree_add_item_ret_uint(sbas_l1_mt25_tree, hf_sbas_l1_mt25_h2_velocity_code,
1491             tvb, 14, 1, ENC_NA, &velocity_code);
1492     if (velocity_code == 0) {
1493         proto_tree_add_item(sbas_l1_mt25_tree, hf_sbas_l1_mt25_h2_v0_prn_mask_nr_1,
1494                 tvb, 14, 1, ENC_NA);
1495         proto_tree_add_item(sbas_l1_mt25_tree, hf_sbas_l1_mt25_h2_v0_iod_1,
1496                 tvb, 14, 2, ENC_BIG_ENDIAN);
1497         proto_tree_add_item(sbas_l1_mt25_tree, hf_sbas_l1_mt25_h2_v0_delta_x_1,
1498                 tvb, 15, 2, ENC_BIG_ENDIAN);
1499         proto_tree_add_item(sbas_l1_mt25_tree, hf_sbas_l1_mt25_h2_v0_delta_y_1,
1500                 tvb, 17, 2, ENC_BIG_ENDIAN);
1501         proto_tree_add_item(sbas_l1_mt25_tree, hf_sbas_l1_mt25_h2_v0_delta_z_1,
1502                 tvb, 18, 2, ENC_BIG_ENDIAN);
1503         proto_tree_add_item(sbas_l1_mt25_tree, hf_sbas_l1_mt25_h2_v0_delta_a_1_f0,
1504                 tvb, 19, 2, ENC_BIG_ENDIAN);
1505
1506         proto_tree_add_item(sbas_l1_mt25_tree, hf_sbas_l1_mt25_h2_v0_prn_mask_nr_2,
1507                 tvb, 20, 2, ENC_BIG_ENDIAN);
1508         proto_tree_add_item(sbas_l1_mt25_tree, hf_sbas_l1_mt25_h2_v0_iod_2,
1509                 tvb, 21, 2, ENC_BIG_ENDIAN);
1510         proto_tree_add_item(sbas_l1_mt25_tree, hf_sbas_l1_mt25_h2_v0_delta_x_2,
1511                 tvb, 22, 2, ENC_BIG_ENDIAN);
1512         proto_tree_add_item(sbas_l1_mt25_tree, hf_sbas_l1_mt25_h2_v0_delta_y_2,
1513                 tvb, 23, 2, ENC_BIG_ENDIAN);
1514         proto_tree_add_item(sbas_l1_mt25_tree, hf_sbas_l1_mt25_h2_v0_delta_z_2,
1515                 tvb, 24, 2, ENC_BIG_ENDIAN);
1516         proto_tree_add_item(sbas_l1_mt25_tree, hf_sbas_l1_mt25_h2_v0_delta_a_2_f0,
1517                 tvb, 25, 2, ENC_BIG_ENDIAN);
1518         proto_tree_add_item(sbas_l1_mt25_tree, hf_sbas_l1_mt25_h2_v0_iodp,
1519                 tvb, 26, 2, ENC_BIG_ENDIAN);
1520         proto_tree_add_item(sbas_l1_mt25_tree, hf_sbas_l1_mt25_h2_v0_spare,
1521                 tvb, 27, 1, ENC_NA);
1522     }
1523     else { // velocity_code == 1
1524         proto_tree_add_item(sbas_l1_mt25_tree, hf_sbas_l1_mt25_h2_v1_prn_mask_nr,
1525                 tvb, 14, 1, ENC_NA);
1526         proto_tree_add_item(sbas_l1_mt25_tree, hf_sbas_l1_mt25_h2_v1_iod,
1527                 tvb, 14, 2, ENC_BIG_ENDIAN);
1528         proto_tree_add_item(sbas_l1_mt25_tree, hf_sbas_l1_mt25_h2_v1_delta_x,
1529                 tvb, 15, 4, ENC_BIG_ENDIAN);
1530         proto_tree_add_item(sbas_l1_mt25_tree, hf_sbas_l1_mt25_h2_v1_delta_y,
1531                 tvb, 17, 4, ENC_BIG_ENDIAN);
1532         proto_tree_add_item(sbas_l1_mt25_tree, hf_sbas_l1_mt25_h2_v1_delta_z,
1533                 tvb, 18, 4, ENC_BIG_ENDIAN);
1534         proto_tree_add_item(sbas_l1_mt25_tree, hf_sbas_l1_mt25_h2_v1_delta_a_f0,
1535                 tvb, 20, 4, ENC_BIG_ENDIAN);
1536         proto_tree_add_item(sbas_l1_mt25_tree, hf_sbas_l1_mt25_h2_v1_delta_x_vel,
1537                 tvb, 21, 4, ENC_BIG_ENDIAN);
1538         proto_tree_add_item(sbas_l1_mt25_tree, hf_sbas_l1_mt25_h2_v1_delta_y_vel,
1539                 tvb, 22, 4, ENC_BIG_ENDIAN);
1540         proto_tree_add_item(sbas_l1_mt25_tree, hf_sbas_l1_mt25_h2_v1_delta_z_vel,
1541                 tvb, 23, 4, ENC_BIG_ENDIAN);
1542         proto_tree_add_item(sbas_l1_mt25_tree, hf_sbas_l1_mt25_h2_v1_delta_a_f1,
1543                 tvb, 24, 4, ENC_BIG_ENDIAN);
1544         proto_tree_add_item(sbas_l1_mt25_tree, hf_sbas_l1_mt25_h2_v1_t_lt,
1545                 tvb, 25, 2, ENC_BIG_ENDIAN);
1546         proto_tree_add_item(sbas_l1_mt25_tree, hf_sbas_l1_mt25_h2_v1_iodp,
1547                 tvb, 27, 1, ENC_NA);
1548     }
1549
1550     return tvb_captured_length(tvb);
1551 }
1552
1553 /* Dissect SBAS L1 MT 26 */
1554 static int dissect_sbas_l1_mt26(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void *data _U_) {
1555     col_set_str(pinfo->cinfo, COL_PROTOCOL, "SBAS L1 MT26");
1556     col_clear(pinfo->cinfo, COL_INFO);
1557
1558     proto_item *ti = proto_tree_add_item(tree, hf_sbas_l1_mt26, tvb, 0, 32, ENC_NA);
1559     proto_tree *sbas_l1_mt26_tree = proto_item_add_subtree(ti, ett_sbas_l1_mt26);
1560
1561     uint32_t igp_band_id;
1562     proto_item* pi_igp_band_id = proto_tree_add_item_ret_uint(sbas_l1_mt26_tree, hf_sbas_l1_mt26_igp_band_id,
1563             tvb, 0, 2, ENC_BIG_ENDIAN, &igp_band_id);
1564     if (igp_band_id > 10) {
1565         expert_add_info_format(pinfo, pi_igp_band_id, &ei_sbas_l1_mt26_igp_band_id, "Invalid IGP Band Identifier");
1566     }
1567
1568     uint32_t igp_block_id;
1569     proto_item* pi_igp_block_id = proto_tree_add_item_ret_uint(sbas_l1_mt26_tree, hf_sbas_l1_mt26_igp_block_id,
1570             tvb, 1, 1, ENC_NA, &igp_block_id);
1571     if (igp_block_id > 13) {
1572         expert_add_info_format(pinfo, pi_igp_block_id, &ei_sbas_l1_mt26_igp_block_id, "Invalid IGP Block Identifier");
1573     }
1574
1575     proto_tree_add_item(sbas_l1_mt26_tree, hf_sbas_l1_mt26_igp_vertical_delay_est_1, tvb, 1, 2, ENC_BIG_ENDIAN);
1576     proto_tree_add_item(sbas_l1_mt26_tree, hf_sbas_l1_mt26_givei_1, tvb, 2, 2, ENC_BIG_ENDIAN);
1577     proto_tree_add_item(sbas_l1_mt26_tree, hf_sbas_l1_mt26_igp_vertical_delay_est_2, tvb, 3, 2, ENC_BIG_ENDIAN);
1578     proto_tree_add_item(sbas_l1_mt26_tree, hf_sbas_l1_mt26_givei_2, tvb, 4, 2, ENC_BIG_ENDIAN);
1579     proto_tree_add_item(sbas_l1_mt26_tree, hf_sbas_l1_mt26_igp_vertical_delay_est_3, tvb, 5, 2, ENC_BIG_ENDIAN);
1580     proto_tree_add_item(sbas_l1_mt26_tree, hf_sbas_l1_mt26_givei_3, tvb, 6, 2, ENC_BIG_ENDIAN);
1581     proto_tree_add_item(sbas_l1_mt26_tree, hf_sbas_l1_mt26_igp_vertical_delay_est_4, tvb, 6, 2, ENC_BIG_ENDIAN);
1582     proto_tree_add_item(sbas_l1_mt26_tree, hf_sbas_l1_mt26_givei_4, tvb, 7, 2, ENC_BIG_ENDIAN);
1583     proto_tree_add_item(sbas_l1_mt26_tree, hf_sbas_l1_mt26_igp_vertical_delay_est_5, tvb, 8, 2, ENC_BIG_ENDIAN);
1584     proto_tree_add_item(sbas_l1_mt26_tree, hf_sbas_l1_mt26_givei_5, tvb, 9, 2, ENC_BIG_ENDIAN);
1585     proto_tree_add_item(sbas_l1_mt26_tree, hf_sbas_l1_mt26_igp_vertical_delay_est_6, tvb, 9, 2, ENC_BIG_ENDIAN);
1586     proto_tree_add_item(sbas_l1_mt26_tree, hf_sbas_l1_mt26_givei_6, tvb, 11, 2, ENC_BIG_ENDIAN);
1587     proto_tree_add_item(sbas_l1_mt26_tree, hf_sbas_l1_mt26_igp_vertical_delay_est_7, tvb, 11, 2, ENC_BIG_ENDIAN);
1588     proto_tree_add_item(sbas_l1_mt26_tree, hf_sbas_l1_mt26_givei_7, tvb, 12, 2, ENC_BIG_ENDIAN);
1589     proto_tree_add_item(sbas_l1_mt26_tree, hf_sbas_l1_mt26_igp_vertical_delay_est_8, tvb, 13, 2, ENC_BIG_ENDIAN);
1590     proto_tree_add_item(sbas_l1_mt26_tree, hf_sbas_l1_mt26_givei_8, tvb, 14, 2, ENC_BIG_ENDIAN);
1591     proto_tree_add_item(sbas_l1_mt26_tree, hf_sbas_l1_mt26_igp_vertical_delay_est_9, tvb, 14, 2, ENC_BIG_ENDIAN);
1592     proto_tree_add_item(sbas_l1_mt26_tree, hf_sbas_l1_mt26_givei_9, tvb, 15, 2, ENC_BIG_ENDIAN);
1593     proto_tree_add_item(sbas_l1_mt26_tree, hf_sbas_l1_mt26_igp_vertical_delay_est_10, tvb, 16, 2, ENC_BIG_ENDIAN);
1594     proto_tree_add_item(sbas_l1_mt26_tree, hf_sbas_l1_mt26_givei_10, tvb, 17, 2, ENC_BIG_ENDIAN);
1595     proto_tree_add_item(sbas_l1_mt26_tree, hf_sbas_l1_mt26_igp_vertical_delay_est_11, tvb, 18, 2, ENC_BIG_ENDIAN);
1596     proto_tree_add_item(sbas_l1_mt26_tree, hf_sbas_l1_mt26_givei_11, tvb, 19, 2, ENC_BIG_ENDIAN);
1597     proto_tree_add_item(sbas_l1_mt26_tree, hf_sbas_l1_mt26_igp_vertical_delay_est_12, tvb, 19, 2, ENC_BIG_ENDIAN);
1598     proto_tree_add_item(sbas_l1_mt26_tree, hf_sbas_l1_mt26_givei_12, tvb, 20, 2, ENC_BIG_ENDIAN);
1599     proto_tree_add_item(sbas_l1_mt26_tree, hf_sbas_l1_mt26_igp_vertical_delay_est_13, tvb, 21, 2, ENC_BIG_ENDIAN);
1600     proto_tree_add_item(sbas_l1_mt26_tree, hf_sbas_l1_mt26_givei_13, tvb, 22, 2, ENC_BIG_ENDIAN);
1601     proto_tree_add_item(sbas_l1_mt26_tree, hf_sbas_l1_mt26_igp_vertical_delay_est_14, tvb, 22, 2, ENC_BIG_ENDIAN);
1602     proto_tree_add_item(sbas_l1_mt26_tree, hf_sbas_l1_mt26_givei_14, tvb, 24, 2, ENC_BIG_ENDIAN);
1603     proto_tree_add_item(sbas_l1_mt26_tree, hf_sbas_l1_mt26_igp_vertical_delay_est_15, tvb, 24, 2, ENC_BIG_ENDIAN);
1604     proto_tree_add_item(sbas_l1_mt26_tree, hf_sbas_l1_mt26_givei_15, tvb, 25, 2, ENC_BIG_ENDIAN);
1605     proto_tree_add_item(sbas_l1_mt26_tree, hf_sbas_l1_mt26_iodi_k, tvb, 26, 1, ENC_NA);
1606     proto_tree_add_item(sbas_l1_mt26_tree, hf_sbas_l1_mt26_spare, tvb, 26, 2, ENC_BIG_ENDIAN);
1607
1608     return tvb_captured_length(tvb);
1609 }
1610
1611 /* Dissect SBAS L1 MT 63 */
1612 static int dissect_sbas_l1_mt63(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void *data _U_) {
1613     col_set_str(pinfo->cinfo, COL_PROTOCOL, "SBAS L1 MT63");
1614     col_clear(pinfo->cinfo, COL_INFO);
1615
1616     proto_item *ti = proto_tree_add_item(tree, hf_sbas_l1_mt63, tvb, 0, 32, ENC_NA);
1617     proto_tree *sbas_l1_mt63_tree = proto_item_add_subtree(ti, ett_sbas_l1_mt63);
1618
1619     proto_tree_add_item(sbas_l1_mt63_tree, hf_sbas_l1_mt63_spare_1, tvb,  0,  1, ENC_NA);
1620     proto_tree_add_item(sbas_l1_mt63_tree, hf_sbas_l1_mt63_spare_2, tvb,  1, 26, ENC_NA);
1621     proto_tree_add_item(sbas_l1_mt63_tree, hf_sbas_l1_mt63_spare_3, tvb, 27,  1, ENC_NA);
1622
1623     return tvb_captured_length(tvb);
1624 }
1625
1626 void proto_register_sbas_l1(void) {
1627
1628     static hf_register_info hf[] = {
1629         {&hf_sbas_l1_preamble, {"Preamble",     "sbas_l1.preamble", FT_UINT8,  BASE_HEX, NULL, 0xff,       NULL, HFILL}},
1630         {&hf_sbas_l1_mt,       {"Message Type", "sbas_l1.mt"      , FT_UINT8,  BASE_DEC, NULL, 0xfc,       NULL, HFILL}},
1631         {&hf_sbas_l1_chksum,   {"Checksum",     "sbas_l1.chksum"  , FT_UINT32, BASE_HEX, NULL, 0x3fffffc0, NULL, HFILL}},
1632
1633         // MT0
1634         {&hf_sbas_l1_mt0,         {"MT0",     "sbas_l1.mt0",         FT_NONE,  BASE_NONE, NULL, 0x00, NULL, HFILL}},
1635         {&hf_sbas_l1_mt0_spare_1, {"Spare 1", "sbas_l1.mt0.spare_1", FT_UINT8, BASE_HEX,  NULL, 0x03, NULL, HFILL}},
1636         {&hf_sbas_l1_mt0_spare_2, {"Spare 2", "sbas_l1.mt0.spare_2", FT_BYTES, SEP_SPACE, NULL, 0x00, NULL, HFILL}},
1637         {&hf_sbas_l1_mt0_spare_3, {"Spare 3", "sbas_l1.mt0.spare_3", FT_UINT8, BASE_HEX,  NULL, 0xc0, NULL, HFILL}},
1638
1639         // MT1
1640         {&hf_sbas_l1_mt1,                  {"MT1",                        "sbas_l1.mt1",                  FT_NONE,   BASE_NONE, NULL, 0x0,                          NULL, HFILL}},
1641         {&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}},
1642         {&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}},
1643         {&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}},
1644         {&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}},
1645         {&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}},
1646         {&hf_sbas_l1_mt1_iodp,             {"Issue of Data - PRN (IODP)", "sbas_l1.mt1.iodp",             FT_UINT8,  BASE_DEC,  NULL, 0xc0,                         NULL, HFILL}},
1647
1648         // MT2
1649         {&hf_sbas_l1_mt2,          {"MT2",                                      "sbas_l1.mt2",          FT_NONE,   BASE_NONE,   NULL,                          0x0,        NULL, HFILL}},
1650         {&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}},
1651         {&hf_sbas_l1_mt2_iodp,     {"Issue of Data - PRN (IODP)",               "sbas_l1.mt2.iodp",     FT_UINT8,  BASE_DEC,    NULL,                          0xc0,       NULL, HFILL}},
1652         {&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}},
1653         {&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}},
1654         {&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}},
1655         {&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}},
1656         {&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}},
1657         {&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}},
1658         {&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}},
1659         {&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}},
1660         {&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}},
1661         {&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}},
1662         {&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}},
1663         {&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}},
1664         {&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}},
1665         {&hf_sbas_l1_mt2_udrei_1,  {"UDREI_1",                                  "sbas_l1.mt2.udrei_1",  FT_UINT16, BASE_DEC,    VALS(UDREI_EVALUATION),        0x03c0,     NULL, HFILL}},
1666         {&hf_sbas_l1_mt2_udrei_2,  {"UDREI_2",                                  "sbas_l1.mt2.udrei_2",  FT_UINT16, BASE_DEC,    VALS(UDREI_EVALUATION),        0x3c00,     NULL, HFILL}},
1667         {&hf_sbas_l1_mt2_udrei_3,  {"UDREI_3",                                  "sbas_l1.mt2.udrei_3",  FT_UINT16, BASE_DEC,    VALS(UDREI_EVALUATION),        0x03c0,     NULL, HFILL}},
1668         {&hf_sbas_l1_mt2_udrei_4,  {"UDREI_4",                                  "sbas_l1.mt2.udrei_4",  FT_UINT16, BASE_DEC,    VALS(UDREI_EVALUATION),        0x3c00,     NULL, HFILL}},
1669         {&hf_sbas_l1_mt2_udrei_5,  {"UDREI_5",                                  "sbas_l1.mt2.udrei_5",  FT_UINT16, BASE_DEC,    VALS(UDREI_EVALUATION),        0x03c0,     NULL, HFILL}},
1670         {&hf_sbas_l1_mt2_udrei_6,  {"UDREI_6",                                  "sbas_l1.mt2.udrei_6",  FT_UINT16, BASE_DEC,    VALS(UDREI_EVALUATION),        0x3c00,     NULL, HFILL}},
1671         {&hf_sbas_l1_mt2_udrei_7,  {"UDREI_7",                                  "sbas_l1.mt2.udrei_7",  FT_UINT16, BASE_DEC,    VALS(UDREI_EVALUATION),        0x03c0,     NULL, HFILL}},
1672         {&hf_sbas_l1_mt2_udrei_8,  {"UDREI_8",                                  "sbas_l1.mt2.udrei_8",  FT_UINT16, BASE_DEC,    VALS(UDREI_EVALUATION),        0x3c00,     NULL, HFILL}},
1673         {&hf_sbas_l1_mt2_udrei_9,  {"UDREI_9",                                  "sbas_l1.mt2.udrei_9",  FT_UINT16, BASE_DEC,    VALS(UDREI_EVALUATION),        0x03c0,     NULL, HFILL}},
1674         {&hf_sbas_l1_mt2_udrei_10, {"UDREI_10",                                 "sbas_l1.mt2.udrei_10", FT_UINT16, BASE_DEC,    VALS(UDREI_EVALUATION),        0x3c00,     NULL, HFILL}},
1675         {&hf_sbas_l1_mt2_udrei_11, {"UDREI_11",                                 "sbas_l1.mt2.udrei_11", FT_UINT16, BASE_DEC,    VALS(UDREI_EVALUATION),        0x03c0,     NULL, HFILL}},
1676         {&hf_sbas_l1_mt2_udrei_12, {"UDREI_12",                                 "sbas_l1.mt2.udrei_12", FT_UINT16, BASE_DEC,    VALS(UDREI_EVALUATION),        0x3c00,     NULL, HFILL}},
1677         {&hf_sbas_l1_mt2_udrei_13, {"UDREI_13",                                 "sbas_l1.mt2.udrei_13", FT_UINT16, BASE_DEC,    VALS(UDREI_EVALUATION),        0x03c0,     NULL, HFILL}},
1678
1679         // MT3
1680         {&hf_sbas_l1_mt3,          {"MT3",                                      "sbas_l1.mt3",          FT_NONE,   BASE_NONE,   NULL,                          0x0,        NULL, HFILL}},
1681         {&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}},
1682         {&hf_sbas_l1_mt3_iodp,     {"Issue of Data - PRN (IODP)",               "sbas_l1.mt3.iodp",     FT_UINT8,  BASE_DEC,    NULL,                          0xc0,       NULL, HFILL}},
1683         {&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}},
1684         {&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}},
1685         {&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}},
1686         {&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}},
1687         {&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}},
1688         {&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}},
1689         {&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}},
1690         {&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}},
1691         {&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}},
1692         {&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}},
1693         {&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}},
1694         {&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}},
1695         {&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}},
1696         {&hf_sbas_l1_mt3_udrei_14, {"UDREI_14",                                 "sbas_l1.mt3.udrei_14", FT_UINT16, BASE_DEC,    VALS(UDREI_EVALUATION),        0x03c0,     NULL, HFILL}},
1697         {&hf_sbas_l1_mt3_udrei_15, {"UDREI_15",                                 "sbas_l1.mt3.udrei_15", FT_UINT16, BASE_DEC,    VALS(UDREI_EVALUATION),        0x3c00,     NULL, HFILL}},
1698         {&hf_sbas_l1_mt3_udrei_16, {"UDREI_16",                                 "sbas_l1.mt3.udrei_16", FT_UINT16, BASE_DEC,    VALS(UDREI_EVALUATION),        0x03c0,     NULL, HFILL}},
1699         {&hf_sbas_l1_mt3_udrei_17, {"UDREI_17",                                 "sbas_l1.mt3.udrei_17", FT_UINT16, BASE_DEC,    VALS(UDREI_EVALUATION),        0x3c00,     NULL, HFILL}},
1700         {&hf_sbas_l1_mt3_udrei_18, {"UDREI_18",                                 "sbas_l1.mt3.udrei_18", FT_UINT16, BASE_DEC,    VALS(UDREI_EVALUATION),        0x03c0,     NULL, HFILL}},
1701         {&hf_sbas_l1_mt3_udrei_19, {"UDREI_19",                                 "sbas_l1.mt3.udrei_19", FT_UINT16, BASE_DEC,    VALS(UDREI_EVALUATION),        0x3c00,     NULL, HFILL}},
1702         {&hf_sbas_l1_mt3_udrei_20, {"UDREI_20",                                 "sbas_l1.mt3.udrei_20", FT_UINT16, BASE_DEC,    VALS(UDREI_EVALUATION),        0x03c0,     NULL, HFILL}},
1703         {&hf_sbas_l1_mt3_udrei_21, {"UDREI_21",                                 "sbas_l1.mt3.udrei_21", FT_UINT16, BASE_DEC,    VALS(UDREI_EVALUATION),        0x3c00,     NULL, HFILL}},
1704         {&hf_sbas_l1_mt3_udrei_22, {"UDREI_22",                                 "sbas_l1.mt3.udrei_22", FT_UINT16, BASE_DEC,    VALS(UDREI_EVALUATION),        0x03c0,     NULL, HFILL}},
1705         {&hf_sbas_l1_mt3_udrei_23, {"UDREI_23",                                 "sbas_l1.mt3.udrei_23", FT_UINT16, BASE_DEC,    VALS(UDREI_EVALUATION),        0x3c00,     NULL, HFILL}},
1706         {&hf_sbas_l1_mt3_udrei_24, {"UDREI_24",                                 "sbas_l1.mt3.udrei_24", FT_UINT16, BASE_DEC,    VALS(UDREI_EVALUATION),        0x03c0,     NULL, HFILL}},
1707         {&hf_sbas_l1_mt3_udrei_25, {"UDREI_25",                                 "sbas_l1.mt3.udrei_25", FT_UINT16, BASE_DEC,    VALS(UDREI_EVALUATION),        0x3c00,     NULL, HFILL}},
1708         {&hf_sbas_l1_mt3_udrei_26, {"UDREI_26",                                 "sbas_l1.mt3.udrei_26", FT_UINT16, BASE_DEC,    VALS(UDREI_EVALUATION),        0x03c0,     NULL, HFILL}},
1709
1710         // MT4
1711         {&hf_sbas_l1_mt4,          {"MT4",                                      "sbas_l1.mt4",          FT_NONE,   BASE_NONE,   NULL,                          0x0,        NULL, HFILL}},
1712         {&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}},
1713         {&hf_sbas_l1_mt4_iodp,     {"Issue of Data - PRN (IODP)",               "sbas_l1.mt4.iodp",     FT_UINT8,  BASE_DEC,    NULL,                          0xc0,       NULL, HFILL}},
1714         {&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}},
1715         {&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}},
1716         {&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}},
1717         {&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}},
1718         {&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}},
1719         {&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}},
1720         {&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}},
1721         {&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}},
1722         {&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}},
1723         {&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}},
1724         {&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}},
1725         {&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}},
1726         {&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}},
1727         {&hf_sbas_l1_mt4_udrei_27, {"UDREI_27",                                 "sbas_l1.mt4.udrei_27", FT_UINT16, BASE_DEC,    VALS(UDREI_EVALUATION),        0x03c0,     NULL, HFILL}},
1728         {&hf_sbas_l1_mt4_udrei_28, {"UDREI_28",                                 "sbas_l1.mt4.udrei_28", FT_UINT16, BASE_DEC,    VALS(UDREI_EVALUATION),        0x3c00,     NULL, HFILL}},
1729         {&hf_sbas_l1_mt4_udrei_29, {"UDREI_29",                                 "sbas_l1.mt4.udrei_29", FT_UINT16, BASE_DEC,    VALS(UDREI_EVALUATION),        0x03c0,     NULL, HFILL}},
1730         {&hf_sbas_l1_mt4_udrei_30, {"UDREI_30",                                 "sbas_l1.mt4.udrei_30", FT_UINT16, BASE_DEC,    VALS(UDREI_EVALUATION),        0x3c00,     NULL, HFILL}},
1731         {&hf_sbas_l1_mt4_udrei_31, {"UDREI_31",                                 "sbas_l1.mt4.udrei_31", FT_UINT16, BASE_DEC,    VALS(UDREI_EVALUATION),        0x03c0,     NULL, HFILL}},
1732         {&hf_sbas_l1_mt4_udrei_32, {"UDREI_32",                                 "sbas_l1.mt4.udrei_32", FT_UINT16, BASE_DEC,    VALS(UDREI_EVALUATION),        0x3c00,     NULL, HFILL}},
1733         {&hf_sbas_l1_mt4_udrei_33, {"UDREI_33",                                 "sbas_l1.mt4.udrei_33", FT_UINT16, BASE_DEC,    VALS(UDREI_EVALUATION),        0x03c0,     NULL, HFILL}},
1734         {&hf_sbas_l1_mt4_udrei_34, {"UDREI_34",                                 "sbas_l1.mt4.udrei_34", FT_UINT16, BASE_DEC,    VALS(UDREI_EVALUATION),        0x3c00,     NULL, HFILL}},
1735         {&hf_sbas_l1_mt4_udrei_35, {"UDREI_35",                                 "sbas_l1.mt4.udrei_35", FT_UINT16, BASE_DEC,    VALS(UDREI_EVALUATION),        0x03c0,     NULL, HFILL}},
1736         {&hf_sbas_l1_mt4_udrei_36, {"UDREI_36",                                 "sbas_l1.mt4.udrei_36", FT_UINT16, BASE_DEC,    VALS(UDREI_EVALUATION),        0x3c00,     NULL, HFILL}},
1737         {&hf_sbas_l1_mt4_udrei_37, {"UDREI_37",                                 "sbas_l1.mt4.udrei_37", FT_UINT16, BASE_DEC,    VALS(UDREI_EVALUATION),        0x03c0,     NULL, HFILL}},
1738         {&hf_sbas_l1_mt4_udrei_38, {"UDREI_38",                                 "sbas_l1.mt4.udrei_38", FT_UINT16, BASE_DEC,    VALS(UDREI_EVALUATION),        0x3c00,     NULL, HFILL}},
1739         {&hf_sbas_l1_mt4_udrei_39, {"UDREI_39",                                 "sbas_l1.mt4.udrei_39", FT_UINT16, BASE_DEC,    VALS(UDREI_EVALUATION),        0x03c0,     NULL, HFILL}},
1740
1741         // MT5
1742         {&hf_sbas_l1_mt5,          {"MT5",                                      "sbas_l1.mt5",          FT_NONE,   BASE_NONE,   NULL,                          0x0,        NULL, HFILL}},
1743         {&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}},
1744         {&hf_sbas_l1_mt5_iodp,     {"Issue of Data - PRN (IODP)",               "sbas_l1.mt5.iodp",     FT_UINT8,  BASE_DEC,    NULL,                          0xc0,       NULL, HFILL}},
1745         {&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}},
1746         {&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}},
1747         {&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}},
1748         {&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}},
1749         {&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}},
1750         {&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}},
1751         {&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}},
1752         {&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}},
1753         {&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}},
1754         {&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}},
1755         {&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}},
1756         {&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}},
1757         {&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}},
1758         {&hf_sbas_l1_mt5_udrei_40, {"UDREI_40",                                 "sbas_l1.mt5.udrei_40", FT_UINT16, BASE_DEC,    VALS(UDREI_EVALUATION),        0x03c0,     NULL, HFILL}},
1759         {&hf_sbas_l1_mt5_udrei_41, {"UDREI_41",                                 "sbas_l1.mt5.udrei_41", FT_UINT16, BASE_DEC,    VALS(UDREI_EVALUATION),        0x3c00,     NULL, HFILL}},
1760         {&hf_sbas_l1_mt5_udrei_42, {"UDREI_42",                                 "sbas_l1.mt5.udrei_42", FT_UINT16, BASE_DEC,    VALS(UDREI_EVALUATION),        0x03c0,     NULL, HFILL}},
1761         {&hf_sbas_l1_mt5_udrei_43, {"UDREI_43",                                 "sbas_l1.mt5.udrei_43", FT_UINT16, BASE_DEC,    VALS(UDREI_EVALUATION),        0x3c00,     NULL, HFILL}},
1762         {&hf_sbas_l1_mt5_udrei_44, {"UDREI_44",                                 "sbas_l1.mt5.udrei_44", FT_UINT16, BASE_DEC,    VALS(UDREI_EVALUATION),        0x03c0,     NULL, HFILL}},
1763         {&hf_sbas_l1_mt5_udrei_45, {"UDREI_45",                                 "sbas_l1.mt5.udrei_45", FT_UINT16, BASE_DEC,    VALS(UDREI_EVALUATION),        0x3c00,     NULL, HFILL}},
1764         {&hf_sbas_l1_mt5_udrei_46, {"UDREI_46",                                 "sbas_l1.mt5.udrei_46", FT_UINT16, BASE_DEC,    VALS(UDREI_EVALUATION),        0x03c0,     NULL, HFILL}},
1765         {&hf_sbas_l1_mt5_udrei_47, {"UDREI_47",                                 "sbas_l1.mt5.udrei_47", FT_UINT16, BASE_DEC,    VALS(UDREI_EVALUATION),        0x3c00,     NULL, HFILL}},
1766         {&hf_sbas_l1_mt5_udrei_48, {"UDREI_48",                                 "sbas_l1.mt5.udrei_48", FT_UINT16, BASE_DEC,    VALS(UDREI_EVALUATION),        0x03c0,     NULL, HFILL}},
1767         {&hf_sbas_l1_mt5_udrei_49, {"UDREI_49",                                 "sbas_l1.mt5.udrei_49", FT_UINT16, BASE_DEC,    VALS(UDREI_EVALUATION),        0x3c00,     NULL, HFILL}},
1768         {&hf_sbas_l1_mt5_udrei_50, {"UDREI_50",                                 "sbas_l1.mt5.udrei_50", FT_UINT16, BASE_DEC,    VALS(UDREI_EVALUATION),        0x03c0,     NULL, HFILL}},
1769         {&hf_sbas_l1_mt5_udrei_51, {"UDREI_51",                                 "sbas_l1.mt5.udrei_51", FT_UINT16, BASE_DEC,    VALS(UDREI_EVALUATION),        0x3c00,     NULL, HFILL}},
1770         {&hf_sbas_l1_mt5_udrei_52, {"UDREI_52",                                 "sbas_l1.mt5.udrei_52", FT_UINT16, BASE_DEC,    VALS(UDREI_EVALUATION),        0x03c0,     NULL, HFILL}},
1771
1772         // MT6
1773         {&hf_sbas_l1_mt6,          {"MT6",                                      "sbas_l1.mt6",          FT_NONE,   BASE_NONE, NULL,                   0x0,    NULL, HFILL}},
1774         {&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}},
1775         {&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}},
1776         {&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}},
1777         {&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}},
1778         {&hf_sbas_l1_mt6_udrei_1,  {"UDREI_1",                                  "sbas_l1.mt6.udrei_1",  FT_UINT16, BASE_DEC,  VALS(UDREI_EVALUATION), 0x03c0, NULL, HFILL}},
1779         {&hf_sbas_l1_mt6_udrei_2,  {"UDREI_2",                                  "sbas_l1.mt6.udrei_2",  FT_UINT16, BASE_DEC,  VALS(UDREI_EVALUATION), 0x3c00, NULL, HFILL}},
1780         {&hf_sbas_l1_mt6_udrei_3,  {"UDREI_3",                                  "sbas_l1.mt6.udrei_3",  FT_UINT16, BASE_DEC,  VALS(UDREI_EVALUATION), 0x03c0, NULL, HFILL}},
1781         {&hf_sbas_l1_mt6_udrei_4,  {"UDREI_4",                                  "sbas_l1.mt6.udrei_4",  FT_UINT16, BASE_DEC,  VALS(UDREI_EVALUATION), 0x3c00, NULL, HFILL}},
1782         {&hf_sbas_l1_mt6_udrei_5,  {"UDREI_5",                                  "sbas_l1.mt6.udrei_5",  FT_UINT16, BASE_DEC,  VALS(UDREI_EVALUATION), 0x03c0, NULL, HFILL}},
1783         {&hf_sbas_l1_mt6_udrei_6,  {"UDREI_6",                                  "sbas_l1.mt6.udrei_6",  FT_UINT16, BASE_DEC,  VALS(UDREI_EVALUATION), 0x3c00, NULL, HFILL}},
1784         {&hf_sbas_l1_mt6_udrei_7,  {"UDREI_7",                                  "sbas_l1.mt6.udrei_7",  FT_UINT16, BASE_DEC,  VALS(UDREI_EVALUATION), 0x03c0, NULL, HFILL}},
1785         {&hf_sbas_l1_mt6_udrei_8,  {"UDREI_8",                                  "sbas_l1.mt6.udrei_8",  FT_UINT16, BASE_DEC,  VALS(UDREI_EVALUATION), 0x3c00, NULL, HFILL}},
1786         {&hf_sbas_l1_mt6_udrei_9,  {"UDREI_9",                                  "sbas_l1.mt6.udrei_9",  FT_UINT16, BASE_DEC,  VALS(UDREI_EVALUATION), 0x03c0, NULL, HFILL}},
1787         {&hf_sbas_l1_mt6_udrei_10, {"UDREI_10",                                 "sbas_l1.mt6.udrei_10", FT_UINT16, BASE_DEC,  VALS(UDREI_EVALUATION), 0x3c00, NULL, HFILL}},
1788         {&hf_sbas_l1_mt6_udrei_11, {"UDREI_11",                                 "sbas_l1.mt6.udrei_11", FT_UINT16, BASE_DEC,  VALS(UDREI_EVALUATION), 0x03c0, NULL, HFILL}},
1789         {&hf_sbas_l1_mt6_udrei_12, {"UDREI_12",                                 "sbas_l1.mt6.udrei_12", FT_UINT16, BASE_DEC,  VALS(UDREI_EVALUATION), 0x3c00, NULL, HFILL}},
1790         {&hf_sbas_l1_mt6_udrei_13, {"UDREI_13",                                 "sbas_l1.mt6.udrei_13", FT_UINT16, BASE_DEC,  VALS(UDREI_EVALUATION), 0x03c0, NULL, HFILL}},
1791         {&hf_sbas_l1_mt6_udrei_14, {"UDREI_14",                                 "sbas_l1.mt6.udrei_14", FT_UINT16, BASE_DEC,  VALS(UDREI_EVALUATION), 0x3c00, NULL, HFILL}},
1792         {&hf_sbas_l1_mt6_udrei_15, {"UDREI_15",                                 "sbas_l1.mt6.udrei_15", FT_UINT16, BASE_DEC,  VALS(UDREI_EVALUATION), 0x03c0, NULL, HFILL}},
1793         {&hf_sbas_l1_mt6_udrei_16, {"UDREI_16",                                 "sbas_l1.mt6.udrei_16", FT_UINT16, BASE_DEC,  VALS(UDREI_EVALUATION), 0x3c00, NULL, HFILL}},
1794         {&hf_sbas_l1_mt6_udrei_17, {"UDREI_17",                                 "sbas_l1.mt6.udrei_17", FT_UINT16, BASE_DEC,  VALS(UDREI_EVALUATION), 0x03c0, NULL, HFILL}},
1795         {&hf_sbas_l1_mt6_udrei_18, {"UDREI_18",                                 "sbas_l1.mt6.udrei_18", FT_UINT16, BASE_DEC,  VALS(UDREI_EVALUATION), 0x3c00, NULL, HFILL}},
1796         {&hf_sbas_l1_mt6_udrei_19, {"UDREI_19",                                 "sbas_l1.mt6.udrei_19", FT_UINT16, BASE_DEC,  VALS(UDREI_EVALUATION), 0x03c0, NULL, HFILL}},
1797         {&hf_sbas_l1_mt6_udrei_20, {"UDREI_20",                                 "sbas_l1.mt6.udrei_20", FT_UINT16, BASE_DEC,  VALS(UDREI_EVALUATION), 0x3c00, NULL, HFILL}},
1798         {&hf_sbas_l1_mt6_udrei_21, {"UDREI_21",                                 "sbas_l1.mt6.udrei_21", FT_UINT16, BASE_DEC,  VALS(UDREI_EVALUATION), 0x03c0, NULL, HFILL}},
1799         {&hf_sbas_l1_mt6_udrei_22, {"UDREI_22",                                 "sbas_l1.mt6.udrei_22", FT_UINT16, BASE_DEC,  VALS(UDREI_EVALUATION), 0x3c00, NULL, HFILL}},
1800         {&hf_sbas_l1_mt6_udrei_23, {"UDREI_23",                                 "sbas_l1.mt6.udrei_23", FT_UINT16, BASE_DEC,  VALS(UDREI_EVALUATION), 0x03c0, NULL, HFILL}},
1801         {&hf_sbas_l1_mt6_udrei_24, {"UDREI_24",                                 "sbas_l1.mt6.udrei_24", FT_UINT16, BASE_DEC,  VALS(UDREI_EVALUATION), 0x3c00, NULL, HFILL}},
1802         {&hf_sbas_l1_mt6_udrei_25, {"UDREI_25",                                 "sbas_l1.mt6.udrei_25", FT_UINT16, BASE_DEC,  VALS(UDREI_EVALUATION), 0x03c0, NULL, HFILL}},
1803         {&hf_sbas_l1_mt6_udrei_26, {"UDREI_26",                                 "sbas_l1.mt6.udrei_26", FT_UINT16, BASE_DEC,  VALS(UDREI_EVALUATION), 0x3c00, NULL, HFILL}},
1804         {&hf_sbas_l1_mt6_udrei_27, {"UDREI_27",                                 "sbas_l1.mt6.udrei_27", FT_UINT16, BASE_DEC,  VALS(UDREI_EVALUATION), 0x03c0, NULL, HFILL}},
1805         {&hf_sbas_l1_mt6_udrei_28, {"UDREI_28",                                 "sbas_l1.mt6.udrei_28", FT_UINT16, BASE_DEC,  VALS(UDREI_EVALUATION), 0x3c00, NULL, HFILL}},
1806         {&hf_sbas_l1_mt6_udrei_29, {"UDREI_29",                                 "sbas_l1.mt6.udrei_29", FT_UINT16, BASE_DEC,  VALS(UDREI_EVALUATION), 0x03c0, NULL, HFILL}},
1807         {&hf_sbas_l1_mt6_udrei_30, {"UDREI_30",                                 "sbas_l1.mt6.udrei_30", FT_UINT16, BASE_DEC,  VALS(UDREI_EVALUATION), 0x3c00, NULL, HFILL}},
1808         {&hf_sbas_l1_mt6_udrei_31, {"UDREI_31",                                 "sbas_l1.mt6.udrei_31", FT_UINT16, BASE_DEC,  VALS(UDREI_EVALUATION), 0x03c0, NULL, HFILL}},
1809         {&hf_sbas_l1_mt6_udrei_32, {"UDREI_32",                                 "sbas_l1.mt6.udrei_32", FT_UINT16, BASE_DEC,  VALS(UDREI_EVALUATION), 0x3c00, NULL, HFILL}},
1810         {&hf_sbas_l1_mt6_udrei_33, {"UDREI_33",                                 "sbas_l1.mt6.udrei_33", FT_UINT16, BASE_DEC,  VALS(UDREI_EVALUATION), 0x03c0, NULL, HFILL}},
1811         {&hf_sbas_l1_mt6_udrei_34, {"UDREI_34",                                 "sbas_l1.mt6.udrei_34", FT_UINT16, BASE_DEC,  VALS(UDREI_EVALUATION), 0x3c00, NULL, HFILL}},
1812         {&hf_sbas_l1_mt6_udrei_35, {"UDREI_35",                                 "sbas_l1.mt6.udrei_35", FT_UINT16, BASE_DEC,  VALS(UDREI_EVALUATION), 0x03c0, NULL, HFILL}},
1813         {&hf_sbas_l1_mt6_udrei_36, {"UDREI_36",                                 "sbas_l1.mt6.udrei_36", FT_UINT16, BASE_DEC,  VALS(UDREI_EVALUATION), 0x3c00, NULL, HFILL}},
1814         {&hf_sbas_l1_mt6_udrei_37, {"UDREI_37",                                 "sbas_l1.mt6.udrei_37", FT_UINT16, BASE_DEC,  VALS(UDREI_EVALUATION), 0x03c0, NULL, HFILL}},
1815         {&hf_sbas_l1_mt6_udrei_38, {"UDREI_38",                                 "sbas_l1.mt6.udrei_38", FT_UINT16, BASE_DEC,  VALS(UDREI_EVALUATION), 0x3c00, NULL, HFILL}},
1816         {&hf_sbas_l1_mt6_udrei_39, {"UDREI_39",                                 "sbas_l1.mt6.udrei_39", FT_UINT16, BASE_DEC,  VALS(UDREI_EVALUATION), 0x03c0, NULL, HFILL}},
1817         {&hf_sbas_l1_mt6_udrei_40, {"UDREI_40",                                 "sbas_l1.mt6.udrei_40", FT_UINT16, BASE_DEC,  VALS(UDREI_EVALUATION), 0x3c00, NULL, HFILL}},
1818         {&hf_sbas_l1_mt6_udrei_41, {"UDREI_41",                                 "sbas_l1.mt6.udrei_41", FT_UINT16, BASE_DEC,  VALS(UDREI_EVALUATION), 0x03c0, NULL, HFILL}},
1819         {&hf_sbas_l1_mt6_udrei_42, {"UDREI_42",                                 "sbas_l1.mt6.udrei_42", FT_UINT16, BASE_DEC,  VALS(UDREI_EVALUATION), 0x3c00, NULL, HFILL}},
1820         {&hf_sbas_l1_mt6_udrei_43, {"UDREI_43",                                 "sbas_l1.mt6.udrei_43", FT_UINT16, BASE_DEC,  VALS(UDREI_EVALUATION), 0x03c0, NULL, HFILL}},
1821         {&hf_sbas_l1_mt6_udrei_44, {"UDREI_44",                                 "sbas_l1.mt6.udrei_44", FT_UINT16, BASE_DEC,  VALS(UDREI_EVALUATION), 0x3c00, NULL, HFILL}},
1822         {&hf_sbas_l1_mt6_udrei_45, {"UDREI_45",                                 "sbas_l1.mt6.udrei_45", FT_UINT16, BASE_DEC,  VALS(UDREI_EVALUATION), 0x03c0, NULL, HFILL}},
1823         {&hf_sbas_l1_mt6_udrei_46, {"UDREI_46",                                 "sbas_l1.mt6.udrei_46", FT_UINT16, BASE_DEC,  VALS(UDREI_EVALUATION), 0x3c00, NULL, HFILL}},
1824         {&hf_sbas_l1_mt6_udrei_47, {"UDREI_47",                                 "sbas_l1.mt6.udrei_47", FT_UINT16, BASE_DEC,  VALS(UDREI_EVALUATION), 0x03c0, NULL, HFILL}},
1825         {&hf_sbas_l1_mt6_udrei_48, {"UDREI_48",                                 "sbas_l1.mt6.udrei_48", FT_UINT16, BASE_DEC,  VALS(UDREI_EVALUATION), 0x3c00, NULL, HFILL}},
1826         {&hf_sbas_l1_mt6_udrei_49, {"UDREI_49",                                 "sbas_l1.mt6.udrei_49", FT_UINT16, BASE_DEC,  VALS(UDREI_EVALUATION), 0x03c0, NULL, HFILL}},
1827         {&hf_sbas_l1_mt6_udrei_50, {"UDREI_50",                                 "sbas_l1.mt6.udrei_50", FT_UINT16, BASE_DEC,  VALS(UDREI_EVALUATION), 0x3c00, NULL, HFILL}},
1828         {&hf_sbas_l1_mt6_udrei_51, {"UDREI_51",                                 "sbas_l1.mt6.udrei_51", FT_UINT16, BASE_DEC,  VALS(UDREI_EVALUATION), 0x03c0, NULL, HFILL}},
1829
1830         // MT7
1831         {&hf_sbas_l1_mt7,          {"MT7",                                "sbas_l1.mt7",          FT_NONE,   BASE_NONE, NULL,                               0x0,    NULL, HFILL}},
1832         {&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}},
1833         {&hf_sbas_l1_mt7_iodp,     {"Issue of Data - PRN (IODP)",         "sbas_l1.mt7.iodp",     FT_UINT8,  BASE_DEC,  NULL,                               0x30,   NULL, HFILL}},
1834         {&hf_sbas_l1_mt7_spare,    {"Spare",                              "sbas_l1.mt7.spare",    FT_UINT8,  BASE_DEC,  NULL,                               0x0c,   NULL, HFILL}},
1835         {&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}},
1836         {&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}},
1837         {&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}},
1838         {&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}},
1839         {&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}},
1840         {&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}},
1841         {&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}},
1842         {&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}},
1843         {&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}},
1844         {&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}},
1845         {&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}},
1846         {&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}},
1847         {&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}},
1848         {&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}},
1849         {&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}},
1850         {&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}},
1851         {&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}},
1852         {&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}},
1853         {&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}},
1854         {&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}},
1855         {&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}},
1856         {&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}},
1857         {&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}},
1858         {&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}},
1859         {&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}},
1860         {&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}},
1861         {&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}},
1862         {&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}},
1863         {&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}},
1864         {&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}},
1865         {&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}},
1866         {&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}},
1867         {&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}},
1868         {&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}},
1869         {&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}},
1870         {&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}},
1871         {&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}},
1872         {&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}},
1873         {&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}},
1874         {&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}},
1875         {&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}},
1876         {&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}},
1877         {&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}},
1878         {&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}},
1879         {&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}},
1880         {&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}},
1881         {&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}},
1882         {&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}},
1883         {&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}},
1884         {&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}},
1885         {&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}},
1886
1887         // MT17
1888         {&hf_sbas_l1_mt17,                                                {"MT17",                                   "sbas_l1.mt17",                                                FT_NONE,    BASE_NONE,   NULL,                          0x0,        NULL, HFILL}},
1889         {&hf_sbas_l1_mt17_reserved,                                       {"Reserved",                               "sbas_l1.mt17.reserved",                                       FT_UINT8,   BASE_HEX,    NULL,                          0xc0,       NULL, HFILL}},
1890         {&hf_sbas_l1_mt17_prn,                                            {"PRN",                                    "sbas_l1.mt17.prn",                                            FT_UINT16,  BASE_DEC,    NULL,                          0x3fc0,     NULL, HFILL}},
1891         {&hf_sbas_l1_mt17_health_and_status,                              {"Health and Status",                      "sbas_l1.mt17.health_and_status",                              FT_UINT16,  BASE_HEX,    NULL,                          0x3fc0,     NULL, HFILL}},
1892         {&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}},
1893         {&hf_sbas_l1_mt17_health_and_status_spare,                        {"Spare",                                  "sbas_l1.mt17.health_and_status.spare",                        FT_UINT16,  BASE_HEX,    NULL,                          0x0200,     NULL, HFILL}},
1894         {&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}},
1895         {&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}},
1896         {&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}},
1897         {&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}},
1898         {&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}},
1899         {&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}},
1900         {&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}},
1901         {&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}},
1902         {&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}},
1903         {&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}},
1904
1905         // MT18
1906         {&hf_sbas_l1_mt18,                {"MT18",                                "sbas_l1.mt18",                FT_NONE,   BASE_NONE, NULL, 0x0,                NULL, HFILL}},
1907         {&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}},
1908         {&hf_sbas_l1_mt18_igp_band_id,    {"IGP Band ID",                         "sbas_l1.mt18.igp_band_id",    FT_UINT16, BASE_DEC,  NULL, 0x003c,             NULL, HFILL}},
1909         {&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}},
1910         {&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}},
1911         {&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}},
1912         {&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}},
1913         {&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}},
1914         {&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}},
1915         {&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}},
1916         {&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}},
1917         {&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}},
1918         {&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}},
1919         {&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}},
1920         {&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}},
1921         {&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}},
1922         {&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}},
1923         {&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}},
1924         {&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}},
1925         {&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}},
1926         {&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}},
1927         {&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}},
1928         {&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}},
1929         {&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}},
1930         {&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}},
1931         {&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}},
1932         {&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}},
1933         {&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}},
1934         {&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}},
1935         {&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}},
1936         {&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}},
1937         {&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}},
1938         {&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}},
1939         {&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}},
1940         {&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}},
1941         {&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}},
1942         {&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}},
1943         {&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}},
1944         {&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}},
1945         {&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}},
1946         {&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}},
1947         {&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}},
1948         {&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}},
1949         {&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}},
1950         {&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}},
1951         {&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}},
1952         {&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}},
1953         {&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}},
1954         {&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}},
1955         {&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}},
1956         {&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}},
1957         {&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}},
1958         {&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}},
1959         {&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}},
1960         {&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}},
1961         {&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}},
1962         {&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}},
1963         {&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}},
1964         {&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}},
1965         {&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}},
1966         {&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}},
1967         {&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}},
1968         {&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}},
1969         {&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}},
1970         {&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}},
1971         {&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}},
1972         {&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}},
1973         {&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}},
1974         {&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}},
1975         {&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}},
1976         {&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}},
1977         {&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}},
1978         {&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}},
1979         {&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}},
1980         {&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}},
1981         {&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}},
1982         {&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}},
1983         {&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}},
1984         {&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}},
1985         {&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}},
1986         {&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}},
1987         {&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}},
1988         {&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}},
1989         {&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}},
1990         {&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}},
1991         {&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}},
1992         {&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}},
1993         {&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}},
1994         {&hf_sbas_l1_mt18_spare,          {"Spare",                               "sbas_l1.mt18.spare",          FT_UINT8,  BASE_HEX,  NULL, 0x40,               NULL, HFILL}},
1995
1996         // MT24
1997         {&hf_sbas_l1_mt24,                  {"MT24",                                     "sbas_l1.mt24",                  FT_NONE,   BASE_NONE,   NULL,                          0x0,        NULL, HFILL}},
1998         {&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}},
1999         {&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}},
2000         {&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}},
2001         {&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}},
2002         {&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}},
2003         {&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}},
2004         {&hf_sbas_l1_mt24_udrei_i1,         {"UDREI_i1",                                 "sbas_l1.mt24.udrei_i1",         FT_UINT16, BASE_DEC,    VALS(UDREI_EVALUATION),        0x03c0,     NULL, HFILL}},
2005         {&hf_sbas_l1_mt24_udrei_i2,         {"UDREI_i2",                                 "sbas_l1.mt24.udrei_i2",         FT_UINT16, BASE_DEC,    VALS(UDREI_EVALUATION),        0x3c00,     NULL, HFILL}},
2006         {&hf_sbas_l1_mt24_udrei_i3,         {"UDREI_i3",                                 "sbas_l1.mt24.udrei_i3",         FT_UINT16, BASE_DEC,    VALS(UDREI_EVALUATION),        0x03c0,     NULL, HFILL}},
2007         {&hf_sbas_l1_mt24_udrei_i4,         {"UDREI_i4",                                 "sbas_l1.mt24.udrei_i4",         FT_UINT16, BASE_DEC,    VALS(UDREI_EVALUATION),        0x3c00,     NULL, HFILL}},
2008         {&hf_sbas_l1_mt24_udrei_i5,         {"UDREI_i5",                                 "sbas_l1.mt24.udrei_i5",         FT_UINT16, BASE_DEC,    VALS(UDREI_EVALUATION),        0x03c0,     NULL, HFILL}},
2009         {&hf_sbas_l1_mt24_udrei_i6,         {"UDREI_i6",                                 "sbas_l1.mt24.udrei_i6",         FT_UINT16, BASE_DEC,    VALS(UDREI_EVALUATION),        0x3c00,     NULL, HFILL}},
2010         {&hf_sbas_l1_mt24_iodp,             {"Issue of Data - PRN (IODP)",               "sbas_l1.mt24.iodp",             FT_UINT8,  BASE_DEC,    NULL,                          0x03,   NULL, HFILL}},
2011         {&hf_sbas_l1_mt24_fc_type,          {"Fast Correction Type ID",                  "sbas_l1.mt24.fc_type",          FT_UINT8,  BASE_DEC,    NULL,                          0xc0,   NULL, HFILL}},
2012         {&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}},
2013         {&hf_sbas_l1_mt24_spare,            {"Spare",                                    "sbas_l1.mt24.spare",            FT_UINT8,  BASE_DEC,    NULL,                           0x0f,    NULL, HFILL}},
2014         {&hf_sbas_l1_mt24_velocity_code,    {"Velocity Code",                            "sbas_l1.mt24.velocity_code",    FT_UINT8,  BASE_DEC,    NULL,                           0x80,   NULL, HFILL}},
2015         {&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}},
2016         {&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}},
2017         {&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}},
2018         {&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}},
2019         {&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}},
2020         {&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}},
2021         {&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}},
2022         {&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}},
2023         {&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}},
2024         {&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}},
2025         {&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}},
2026         {&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}},
2027         {&hf_sbas_l1_mt24_v0_iodp,          {"Issue of Data PRN (IODP)",                 "sbas_l1.mt24.v0.iodp",          FT_UINT16, BASE_DEC,    NULL,                           0x0180,   NULL, HFILL}},
2028         {&hf_sbas_l1_mt24_v0_spare,         {"Spare",                                    "sbas_l1.mt24.v0.spare",         FT_UINT8,  BASE_DEC,    NULL,                           0x40,   NULL, HFILL}},
2029         {&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}},
2030         {&hf_sbas_l1_mt24_v1_iod,           {"Issue of Data (IOD_i)",                    "sbas_l1.mt24.v1.iod",           FT_UINT16, BASE_DEC,    NULL,                           0x01fe, NULL, HFILL}},
2031         {&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}},
2032         {&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}},
2033         {&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}},
2034         {&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}},
2035         {&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}},
2036         {&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}},
2037         {&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}},
2038         {&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}},
2039         {&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}},
2040         {&hf_sbas_l1_mt24_v1_iodp,          {"Issue of Data PRN (IODP)",                 "sbas_l1.mt24.v1.iodp",          FT_UINT8,  BASE_DEC,    NULL,                               0xc0,       NULL, HFILL}},
2041
2042         // MT25
2043         {&hf_sbas_l1_mt25,                       {"MT25",                     "sbas_l1.mt25",                     FT_NONE,   BASE_NONE,   NULL,                               0x0,        NULL, HFILL}},
2044         {&hf_sbas_l1_mt25_h1_velocity_code,      {"Velocity Code",            "sbas_l1.mt25.h1.velocity_code",    FT_UINT8,  BASE_DEC,    NULL,                               0x02,       NULL, HFILL}},
2045         {&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}},
2046         {&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}},
2047         {&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}},
2048         {&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}},
2049         {&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}},
2050         {&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}},
2051         {&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}},
2052         {&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}},
2053         {&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}},
2054         {&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}},
2055         {&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}},
2056         {&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}},
2057         {&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}},
2058         {&hf_sbas_l1_mt25_h1_v0_spare,           {"Spare",                    "sbas_l1.mt25.h1.v0.spare",         FT_NONE,   BASE_NONE,   NULL,                               0x0,        NULL, HFILL}},
2059         {&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}},
2060         {&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}},
2061         {&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}},
2062         {&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}},
2063         {&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}},
2064         {&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}},
2065         {&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}},
2066         {&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}},
2067         {&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}},
2068         {&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}},
2069         {&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}},
2070         {&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}},
2071         {&hf_sbas_l1_mt25_h2_velocity_code,      {"Velocity Code",            "sbas_l1.mt25.h2.velocity_code",    FT_UINT8,  BASE_DEC,    NULL,                               0x80,       NULL, HFILL}},
2072         {&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}},
2073         {&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}},
2074         {&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}},
2075         {&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}},
2076         {&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}},
2077         {&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}},
2078         {&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}},
2079         {&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}},
2080         {&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}},
2081         {&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}},
2082         {&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}},
2083         {&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}},
2084         {&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}},
2085         {&hf_sbas_l1_mt25_h2_v0_spare,           {"Spare",                    "sbas_l1.mt25.h2.v0.spare",         FT_NONE,   BASE_NONE,   NULL,                               0x0,        NULL, HFILL}},
2086         {&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}},
2087         {&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}},
2088         {&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}},
2089         {&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}},
2090         {&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}},
2091         {&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}},
2092         {&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}},
2093         {&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}},
2094         {&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}},
2095         {&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}},
2096         {&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}},
2097         {&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}},
2098
2099         // MT26
2100         {&hf_sbas_l1_mt26,                           {"MT26",                          "sbas_l1.mt26",                                     FT_NONE,   BASE_NONE,   NULL,                          0x0,    NULL, HFILL}},
2101         {&hf_sbas_l1_mt26_igp_band_id,               {"IGP Band Identifier",           "sbas_l1.mt26.igp_band_id",                         FT_UINT16, BASE_DEC,    NULL,                          0x03c0, NULL, HFILL}},
2102         {&hf_sbas_l1_mt26_igp_block_id,              {"IGP Block Identifier",          "sbas_l1.mt26.igp_block_id",                        FT_UINT16, BASE_DEC,    NULL,                          0x3c,   NULL, HFILL}},
2103         {&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}},
2104         {&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}},
2105         {&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}},
2106         {&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}},
2107         {&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}},
2108         {&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}},
2109         {&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}},
2110         {&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}},
2111         {&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}},
2112         {&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}},
2113         {&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}},
2114         {&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}},
2115         {&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}},
2116         {&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}},
2117         {&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}},
2118         {&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}},
2119         {&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}},
2120         {&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}},
2121         {&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}},
2122         {&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}},
2123         {&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}},
2124         {&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}},
2125         {&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}},
2126         {&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}},
2127         {&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}},
2128         {&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}},
2129         {&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}},
2130         {&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}},
2131         {&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}},
2132         {&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}},
2133         {&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}},
2134         {&hf_sbas_l1_mt26_spare,                      {"Spare", "sbas_l1.mt26.spare",                                                      FT_UINT16, BASE_DEC,    NULL,                          0x1fc0, NULL, HFILL}},
2135
2136         // MT63
2137         {&hf_sbas_l1_mt63,         {"MT63",    "sbas_l1.mt63",         FT_NONE,  BASE_NONE, NULL, 0x00, NULL, HFILL}},
2138         {&hf_sbas_l1_mt63_spare_1, {"Spare 1", "sbas_l1.mt63.spare_1", FT_UINT8, BASE_HEX,  NULL, 0x03, NULL, HFILL}},
2139         {&hf_sbas_l1_mt63_spare_2, {"Spare 2", "sbas_l1.mt63.spare_2", FT_BYTES, SEP_SPACE, NULL, 0x00, NULL, HFILL}},
2140         {&hf_sbas_l1_mt63_spare_3, {"Spare 3", "sbas_l1.mt63.spare_3", FT_UINT8, BASE_HEX,  NULL, 0xc0, NULL, HFILL}},
2141     };
2142
2143     expert_module_t *expert_sbas_l1;
2144
2145     static ei_register_info ei[] = {
2146         {&ei_sbas_l1_preamble,          {"sbas_l1.illegal_preamble",          PI_PROTOCOL, PI_WARN, "Illegal preamble", EXPFILL}},
2147         {&ei_sbas_l1_mt0,               {"sbas_l1.mt0",                       PI_PROTOCOL, PI_WARN, "MT is 0", EXPFILL}},
2148         {&ei_sbas_l1_crc,               {"sbas_l1.crc",                       PI_CHECKSUM, PI_WARN, "CRC", EXPFILL}},
2149         {&ei_sbas_l1_mt26_igp_band_id,  {"sbas_l1.mt26.illegal_igp_band_id",  PI_PROTOCOL, PI_WARN, "Illegal IGP Band Identifier", EXPFILL}},
2150         {&ei_sbas_l1_mt26_igp_block_id, {"sbas_l1.mt26.illegal_igp_block_id", PI_PROTOCOL, PI_WARN, "Illegal IGP Block Identifier", EXPFILL}},
2151     };
2152
2153     static int *ett[] = {
2154         &ett_sbas_l1,
2155         &ett_sbas_l1_mt0,
2156         &ett_sbas_l1_mt1,
2157         &ett_sbas_l1_mt2,
2158         &ett_sbas_l1_mt3,
2159         &ett_sbas_l1_mt4,
2160         &ett_sbas_l1_mt5,
2161         &ett_sbas_l1_mt6,
2162         &ett_sbas_l1_mt7,
2163         &ett_sbas_l1_mt17,
2164         &ett_sbas_l1_mt17_prn_data[0],
2165         &ett_sbas_l1_mt17_prn_data[1],
2166         &ett_sbas_l1_mt17_prn_data[2],
2167         &ett_sbas_l1_mt17_health_and_status,
2168         &ett_sbas_l1_mt18,
2169         &ett_sbas_l1_mt24,
2170         &ett_sbas_l1_mt25,
2171         &ett_sbas_l1_mt26,
2172         &ett_sbas_l1_mt63,
2173     };
2174
2175     proto_sbas_l1 = proto_register_protocol("SBAS L1 Navigation Message", "SBAS L1", "sbas_l1");
2176
2177     proto_register_field_array(proto_sbas_l1, hf, array_length(hf));
2178     proto_register_subtree_array(ett, array_length(ett));
2179
2180     expert_sbas_l1 = expert_register_protocol(proto_sbas_l1);
2181     expert_register_field_array(expert_sbas_l1, ei, array_length(ei));
2182
2183     register_dissector("sbas_l1", dissect_sbas_l1, proto_sbas_l1);
2184
2185     sbas_l1_mt_dissector_table = register_dissector_table("sbas_l1.mt",
2186             "SBAS L1 MT", proto_sbas_l1, FT_UINT8, BASE_DEC);
2187 }
2188
2189
2190 void proto_reg_handoff_sbas_l1(void) {
2191     dissector_add_uint("ubx.rxm.sfrbx.gnssid", GNSS_ID_SBAS,
2192         create_dissector_handle(dissect_sbas_l1, proto_sbas_l1));
2193
2194     dissector_add_uint("sbas_l1.mt", 0,  create_dissector_handle(dissect_sbas_l1_mt0,  proto_sbas_l1));
2195     dissector_add_uint("sbas_l1.mt", 1,  create_dissector_handle(dissect_sbas_l1_mt1,  proto_sbas_l1));
2196     dissector_add_uint("sbas_l1.mt", 2,  create_dissector_handle(dissect_sbas_l1_mt2,  proto_sbas_l1));
2197     dissector_add_uint("sbas_l1.mt", 3,  create_dissector_handle(dissect_sbas_l1_mt3,  proto_sbas_l1));
2198     dissector_add_uint("sbas_l1.mt", 4,  create_dissector_handle(dissect_sbas_l1_mt4,  proto_sbas_l1));
2199     dissector_add_uint("sbas_l1.mt", 5,  create_dissector_handle(dissect_sbas_l1_mt5,  proto_sbas_l1));
2200     dissector_add_uint("sbas_l1.mt", 6,  create_dissector_handle(dissect_sbas_l1_mt6,  proto_sbas_l1));
2201     dissector_add_uint("sbas_l1.mt", 7,  create_dissector_handle(dissect_sbas_l1_mt7,  proto_sbas_l1));
2202     dissector_add_uint("sbas_l1.mt", 17, create_dissector_handle(dissect_sbas_l1_mt17, proto_sbas_l1));
2203     dissector_add_uint("sbas_l1.mt", 18, create_dissector_handle(dissect_sbas_l1_mt18, proto_sbas_l1));
2204     dissector_add_uint("sbas_l1.mt", 24, create_dissector_handle(dissect_sbas_l1_mt24, proto_sbas_l1));
2205     dissector_add_uint("sbas_l1.mt", 25, create_dissector_handle(dissect_sbas_l1_mt25, proto_sbas_l1));
2206     dissector_add_uint("sbas_l1.mt", 26, create_dissector_handle(dissect_sbas_l1_mt26, proto_sbas_l1));
2207     dissector_add_uint("sbas_l1.mt", 63, create_dissector_handle(dissect_sbas_l1_mt63, proto_sbas_l1));
2208 }