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3. Software Commands
NMEA Output Command
GGA-Global Positioning System Fixed Data
Table B-2 contains the values for the following example:
$GPGGA,161229.487,3723.2475,N,12158.3416,W,1,07,1.0,9.0,M,,,,0000*18
Table B-2 GGA Data Format
Name
Message ID
UTC Time
Latitude
N/S Indicator
Longitude
E/W Indicator
Position Fix Indicator
Satellites Used
HDOP
1
MSL Altitude
Units
1
Geoid Separation
Units
Age of Diff. Corr.
Diff. Ref. Station ID
Checksum
<CR><LF>
SiRF Technology Inc. does not support geoid corrections. Values are WGS84 ellipsoid heights.
Table B-3 Position Fix Indicator
Value
0
1
2
3
ET-333
Example
Units
$GPGGA
161229.487
3723.2475
N
12158.3416
W
1
07
1.0
9.0
meters
M
meters
meters
M
meters
second
0000
*18
Description
Fix not available or invalid
GPS SPS Mode, fix valid
Differential GPS, SPS Mode , fix valid
GPS PPS Mode, fix valid
Page 7 of 15
Description
GGA protocol header
hhmmss.sss
ddmm.mmmm
N=north or S=south
dddmm.mmmm
E=east or W=west
See Table B-3
Range 0 to 12
Horizontal Dilution of Precision
Null fields when DGPS is not used
End of message termination
Specifications are subject to be changed without notice.
Version 1.3.1
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