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A NMEA-0183 Output
120 SPSx51 Modular GPS Receivers User Guide
GGA Time, Position, and Fix Related Data
An example of the GGA message string is shown below. Tabl e A.1 describes the
message fields.
Note – The following data string exceeds the NMEA standard length.
$GPGGA,172814.0,3723.46587704,N,12202.26957864,W,
2,6,1.2,18.893,M,-25.669,M,2.0,0031*4F
Table A.1 GGA message fields
Field Meaning
0 Message ID $GPGGA
1 UTC of position fix
2Latitude
3 Direction of latitude:
N: North
S: South
4 Longitude
5 Direction of longitude:
E: East
W: West
6 GPS Quality indicator:
0: Fix not valid
1: GPS fix
2: Differential GPS fix, OmniSTAR VBS
4: Real-Time Kinematic, fixed integers
5: Real-Time Kinematic, float integers, OmniSTAR XP/HP or Location RTK
7 Number of SVs in use, range from 00 through 12
8 HDOP
9 Orthometric height (MSL reference)
10 M: unit of measure for orthometric height is meters
11 Geoid separation
12 M: geoid separation is measured in meters
13 Age of differential GPS data record, Type 1 or Type 9. Null field when DGPS is
not used.
14 Reference station ID, ranging from 0000 through 1023. A null field when any
reference station ID is selected and no corrections are received
1
.
1
When using OmniSTAR services, ID=100 for OmniSTAR VBS, ID=1000 for OmniSTAR HP, and ID=1008
for OmniSTAR XP.
15 The checksum data, always begins with *