SR-87 GPS Engine Board Manual
$GPGGA
This message transfers global positioning system fix data. Following is an example.
$GPGGA,161229.487,3723.2475,N,12158.3416,W,1,07,1.0,9.0,M, , , ,0000*18
The $GPGGA message structure is shown below:
Field Example Unit Notes
Message ID $GPGGA GGA protocol header.
UTC Time 161229.487 hhmmss.sss
Latitude 3723.2475 ddmm.mmmm
N/S Indicator N N=north or S=south.
Longitude 12158.3416 dddmm.mmmm
E/W indicator W E=east or W=west.
Position Fix Indictor 1
0: Fix not available or invalid.
1: GPS SPS mode, fix valid.
2: Differ. GPS, SPS mode, fix valid
3-5: Not supported.
6: Dead Reckoning Mode, fix valid. (1)
Satellites Used 07 Number of satellites used to calculate fix.
Range 0 to 12.
HDOP 1.0 Horizontal Dilution of Precision.
MSLAltitude (2) 9.0 Meter Altitude above mean seal level.
Units M Meter M stands for “meters”.
Geoid Separation (2) Meter Separation from Geoids can be blank.
Units Meter M stands for “meters”.
Age of Diff. Corr. Second Age in seconds. Blank (Null) fields when
DGPS is not used.
Diff Ref. Station ID 0000
Checksum *18
<CR> <LF> Message terminator.
(1) Only apply to NMEA version 2.3 (and later) in this NMEA message description.
(2) SiRF does not support geoid corrections. Values are WGS84 ellipsoid heights.
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