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GPS 18 Technical Specifications (190-00307-00) Rev. D
Page 18
4.2.7 Recommended Minimum Specific GPS/TRANSIT Data (RMC)
$GPRMC,<1>,<2>,<3>,<4>,<5>,<6>,<7>,<8>,<9>,<10>,<11>,<12>*hh<CR><LF>
<1> UTC time of position fix, hhmmss format for GPS 18 PC/LVC;
hhmmss.s format for GPS 18-5Hz
<2> Status, A = Valid position, V = NAV receiver warning
<3> Latitude, ddmm.mmm format for GPS 18 PC/LVC; ddmm.mmmmm format for GPS 18-5Hz
(leading zeros must be transmitted)
<4> Latitude hemisphere, N or S
<5> Longitude, ddmm.mmm format for GPS 18 PC/LVC; ddmm.mmmmm format for GPS 18-5Hz
(leading zeros must be transmitted)
<6> Longitude hemisphere, E or W
<7> Speed over ground, GPS 18 PC and LVC: 000.0 to 999.9 knots, GPS 18-5Hz: 000.00 to 999.99
knots (leading zeros will be transmitted)
<8> Course over ground, 000.0 to 359.9 degrees, true (leading zeros will be transmitted)
<9> UTC date of position fix, ddmmyy format
<10> Magnetic variation, 000.0 to 180.0 degrees (leading zeros will be transmitted)
<11> Magnetic variation direction, E or W (westerly variation adds to true course)
<12> Mode indicator (only output if NMEA 0183 version 2.30 active), A = Autonomous,
D = Differential, E = Estimated, N = Data not valid
4.2.8 Track Made Good and Ground Speed (VTG)
$GPVTG,<1>,T,<2>,M,<3>,N,<4>,K,<5>*hh<CR><LF>
<1> True course over ground, GPS 18 PC and LVC: 000 to 359 degrees, GPS 18-5Hz: 000.0 to
359.0 degrees(leading zeros will be transmitted)
<2> Magnetic course over ground, 000 to 359 degrees, GPS 18-5Hz: 000.0 to 359.0 degrees(leading
zeros will be transmitted)
<3> Speed over ground, GPS 18 PC and LVC: 000.0 to 999.9 knots, GPS 18-5Hz: 000.00 to 999.99
knots (leading zeros will be transmitted)
<4> Speed over ground, GPS 18 PC and LVC: 0000.0 to 1851.8 kilometers per hour, GPS 18-5Hz:
0000.00 to 1851.89 (leading zeros will be transmitted)
<5> Mode indicator (only output if NMEA 0183 version 2.30 active), A = Autonomous,
D = Differential, E = Estimated, N = Data not valid
4.2.9 Geographic Position (GLL)
$GPGLL,<1>,<2>,<3>,<4>,<5>,<6>,<7>*hh<CR><LF>
<1> Latitude, ddmm.mmm format for GPS 18 PC/LVC; ddmm.mmmmm format for GPS 18-5Hz
(leading zeros must be transmitted)
<2> Latitude hemisphere, N or S
<3> Longitude, ddmm.mmm format for GPS 18 PC/LVC; ddmm.mmmmm format for GPS 18-5Hz
(leading zeros must be transmitted)
<4> Longitude hemisphere, E or W
<5> UTC time of position fix, hhmmss format for GPS 18 PC/LVC; hhmmss.s format for GPS 18-
5Hz
<6> Status, A = Valid position, V = NAV receiver warning
<7> Mode indicator (only output if NMEA 0183 version 2.30 active), A = Autonomous,
D = Differential (WAAS), E = Estimated, N = Data not valid