NMEA-0183 message: GGA
Time, position, and fix related data
An example of the GBS message string is:
$GPGGA,172814.0,3723.46587704,N,12202.26957864,W,
2,6,1.2,18.893,M,-25.669,M,2.0,0031*4F
Note – The data string exceeds the NMEA standard length.
GGA message fields
| Field | Meaning |
|---|---|
| 0 | Message ID $GPGGA |
| 1 | UTC of position fix |
| 2 | Latitude |
| 3 | Direction of latitude: N: North S: South |
| 4 | Longitude |
| 5 | Direction of longitude: E: East W: West |
| 6 | GPS Quality indicator: 0: Fix not valid 1: GPS fix 2: Differential GPS fix, OmniSTAR VBS 4: Real-Time Kinematic, fixed integers 5: Real-Time Kinematic, float integers, OmniSTAR XP/HP or Location RTK |
| 7 | Number of SVs in use, range from 00 through to 24+ |
| 8 | HDOP |
| 9 | Orthometric height (MSL reference) |
| 10 | M: unit of measure for orthometric height is meters |
| 11 | Geoid separation |
| 12 | M: geoid separation measured in meters |
| 13 | Age of differential GPS data record, Type 1 or Type 9. Null field when DGPS is not used. |
| 14 | Reference station ID, range 0000-4095. A null field when any reference station ID is selected and no corrections are received1. |
| 15 | The checksum data, always begins with * |
Note – If a user-defined geoid model, or an inclined plane is loaded into the receiver, then the height output in the NMEA GGA string is always the orthometric height (height above a geoid). The orthometric height is output even if no user-defined geoid is loaded (there is a simplified default geoid in the receiver), or if a user-defined geoid is loaded, or if an inclined plane is used.