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$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
Message ID
UTC Time
Latitude
N/S Indicator
Longitude
E/W indicator
Position Fix Indictor
Satellites Used
HDOP
(2)
MSL Altitude
Units
(2)
Geoid Separation
Units
Age of Diff. Corr.
Diff Ref. Station ID
Checksum
<CR> <LF>
Only apply to NMEA version 2.3 (and later) in this NMEA message description.
(1)
(2)
SiRF does not support geoid corrections. Values are WGS84 ellipsoid heights.
Example
Unit
$GPGGA
161229.487
3723.2475
N
12158.3416
W
1
07
1.0
9.0
Meter
M
Meter
Meter
Meter
Second
0000
*18
Notes
GGA protocol header.
hhmmss.sss
ddmm.mmmm
N=north or S=south.
dddmm.mmmm
E=east or W=west.
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.
Number of satellites used to calculate fix.
Range 0 to 12.
Horizontal Dilution of Precision.
Altitude above mean seal level.
M stands for "meters".
Separation from Geoids can be blank.
M stands for "meters".
Age in seconds.
DGPS is not used.
Message terminator.
14
(1)
Blank (Null) fields when
T-368 User's Guide v1.0
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