GGA - Global Positioning System Fix Data
Time, Position and fix related data for a GPS receiver.
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Field Number:
1) Universal Time Coordinated (UTC)
2) Latitude
3) N or S (North or South)
4) Longitude
5) E or W (East or West)
6) GPS Quality Indicator,
0 - fix not available,
1 - GPS fix,
2 - Differential GPS fix
(values above 2 are 2.3 features)
3 = PPS fix
4 = Real Time Kinematic
5 = Float RTK
6 = estimated (dead reckoning)
7 = Manual input mode
8 = Simulation mode
7) Number of satellites in view, 00 - 12
8) Horizontal Dilution of precision (meters)
9) Antenna Altitude above/below mean-sea-level (geoid) (in meters)
10) Units of antenna altitude, meters
11) Geoidal separation, the difference between the WGS-84 earth
ellipsoid and mean-sea-level (geoid), "-" means mean-sea-level
below ellipsoid
12) Units of geoidal separation, meters
13) Age of differential GPS data, time in seconds since last SC104
type 1 or 9 update, null field when DGPS is not used
14) Differential reference station ID, 0000-1023
15) Checksum