Appendix 2-3
GGA - Global positioning system (GPS) fix data
Version 1.5
$GPGGA,hhmmss,ddmm.mmm,a,dddmm.mmm,a,x,x,xx,uxxxx,M,uxxx,M,xx,xxxx<CR><LF>
1 2
3 4 5 6 7 8 9 10 11 12 13 14
Version 2.1
$GPGGA,hhmmss,ddmm.mmmm,a,dddmm.mmmm,a,x,xx,xx,uxxxx,M,uxxx,M,xx,xxxx*hh<CR><LF>
1 2
3 4 5 6 7 8 9 10 11 12 13 14 15
Version 2.3
$GPGGA,hhmmss.ss,ddmm.mmmm,a,dddmm.mmmm,a,x,xx,xx,uxxxx,M,uxxx,M,xx,xxxx*hh<CR><LF>
1 2
3 4 5 6 7 8 9 10 11 12 13 14 15
1: UTC of position (Version 1.5, 2.1)
1: UTC of position (1/100 sec) (Version 2.3)
2, 3: Latitude (deg, min), N / S
4, 5: Longitude (deg, min), E / W
6: GPS quality indicator
0 = fix not available or invalid
1 = GPS SPS mode
2 = differential GPS, SPS mode
8 = Simulator mode (Version 2.3 only)
7: Number of satellites in use, 00-12, may be different from the number in view
8: Horizontal dilution of precision, 00-20
9, 10: Antenna altitude above/below mean sea level (geoid) (m)
11, 12: Geoidal separation (m)
13: Version 1.5: Age of differential GPS data (NULL if not performing DGPS positioning)
Version 2.1:Age of differential GPS data (00 if not performing DGPS positioning)
Version 2.3:Age of differential GPS data (NULL if not performing DGPS positioning)
14: Version 1.5:Differential reference station ID, 0000-1023
Version 2.1:Differential reference station ID (0000 if not performing DGPS positioning
Version 2.3: Differential reference station ID (NULL if not performing DGPS positioning)
15: Checksum
Note For version 1.5, when the position is not fixed, outputs last measured position data.
For version 2.3, when the position is not fixed, outputs last measured position data, and
time.
For version 2.3, when power is turned on, or master reset is performed, the initial time,
and position settings are NULL.
VTG - Course over ground and ground speed
Version 1.5
$GPVTG, xxx.x,T,,,xxx.x,N,,<CR><LF>
1 2 3 4
Version 2.1
$GPVTG, xxx.x,T,,,xxx.x,N,xxx.x,K*hh<CR><LF>
1 2 3 4 5 6 7
Version 2.3, IEC
$GPVTG, xxx.x,T,,,xxx.x,N,xxx.x,K,x*hh<CR><LF>
1 2 3 4 5 6 7 8
1, 2: Course over ground, degrees true
3, 4: Speed over ground, knots
5, 6: Speed over ground, km/h
7: Checksum (Version 2.1)
7: Mode indicator (Version 2.3, IEC)
A = Autonomous mode
D = Differential mode
N = Data not valid
S = Simulator mode
P = SBAS mode (IEC only)
8: Checksum (Version 2.3, IEC)
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