Time, position and fix-related data for a GPS receiver.
$GPGGA,hhmmss.ss,llll.ll,a,yyyyy.yy,a,x,xx,x.x,x.x,M,x.x,M,x.x,xxxx*CC<CR><LF>
1 2 3 3 4 4 5 6 7 8 9 A B C D
The fields are:
- 1 - Sentence identifier
- 2 - UTC of position
- 3 - Latitude N/S
- 4 - Longitude E/W
- 5 - GPS quality indicator (see note 1)
- 6 - Number of satellites in use, 00-12, may be different from the number in view
- 7 - Measurement Horizontal estimated error / 10.
See GPGSA for true DOP.
- 8 - Antenna altitude above/below mean sea level (geoid)
- 9 - Units of antenna altitude, M = meters
- A - Geoidal separation (see note 3)
- B - Units of geoidal separation, M = meters
- C - Age of differential GPS data (see note 2)
- D - Differential reference station ID, 0000-1023
- CC - checksum
NOTE 1 GPS quality indicator:
- 0 = fix not available or invalid
- 1 = GPS SPS mode, fix valid
- 2 = differential GPS, SPS mode, fix valid
- 3 = GPS PPS mode, fix valid
- 4 = Real Time Kinematic. Satellite system used in RTK mode with fixed integers
- 5 = Float RTK. Satellite system used in RTK mode with FLOATing integers
- 6 = Estimated (dead reckoning) mode
- 7 = Manual input mode
- 8 = Simulator mode The GPS Quality Indicator shall not be a null field.
NOTE 2 Time in seconds since last SC104 type 1 or 9 update, null field when DGPS is not used.
NOTE 3 Geoidal separation: the difference between the WGS-84 earth ellipsoid surface and mean sea level (geoid) surface. Negative values sea level surface below the WGS-84 ellipsoid surface.