ET-314AC
High Performance GPS Engine Board
2010/4/1
- 9 -
SOFTWARE COMMAND
NMEA Output Command
GGA - Global Positioning System Fixed Data
Note – Fields marked in italic
red
apply only to NMEA version 2.3 (and later) in this NMEA
message description
Table A-1 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 A-1 GGA Data Format
Name Example
Units
Description
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 Indicator 1
See Table A-2
Satellites Used
07
Range 0 to 12
HDOP 1.0
Horizontal
Dilution of Precision
MSL Altitude
1
9.0 meters
Units
M
meters
Geoid Separation
1
meters
Units M
meters
Age of Diff. Corr.
second Null fields when DGPS is not used
Diff. Ref. Station ID
0000
Checksum *18
<CR><LF>
End of message termination
Table A-2 Position Fix Indicator
Value Description
0
Fix not available or invalid
1
GPS SPS Mode, fix valid
2
Differential GPS, SPS Mode , fix valid
3-5 Not
supported
6
Dead Reckoning Mode, fix valid
