GGA—Fix Information
The GGA sentence will contain the following data:
- Time (UTC)
- Latitude
- N or S (North or South)
- Longitude
- E or W (East or West)
- GPS Quality Indicator
- 0 - fix not available,
- 1 - GPS fix,
- 2 - Differential GPS fix
- 0 - fix not available,
- Number of satellites in view, 00 - 12
- Horizontal Dilution of precision
- Antenna Altitude above/below mean-sea-level (geoid)
- Units of antenna altitude, meters
- Geoidal separation, the difference between the WGS-84 earth ellipsoid and mean-sea-level (geoid), "-" means mean-sea-level below ellipsoid
- Units of geoidal separation, meters
- Age of differential GPS data, time in seconds since last SC104 type 1 or 9 update, null field when DGPS is not used
- Differential reference station ID, 0000-1023
- Checksum
Not every GPS receiver will send all fields of GGA. A typical receiver might send only TIme, Latitude, Longitude, Altitude, HDOP, and number of satellites in view. The GGA sentence is very useful for a radio DSC position fix update.