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A NMEA-0183 Output
122 SPSx51 Modular GPS Receivers User Guide
GST Position Error Statistics
An example of the GST message string is shown below. Tab le A. 3 describes the
message fields.
$GPGST,172814.0,0.006,0.023,0.020,273.6,0.023,0.020,0.031*6A
Table A.3 GST message fields
Field Meaning
0 Message ID $GPGST
1 UTC of position fix
2 RMS value of the pseudorange residuals; includes carrier phase residuals during
periods of RTK(float) and RTK(fixed) processing
3 Error ellipse semi-major axis 1 sigma error, in meters
4 Error ellipse semi-minor axis 1 sigma error, in meters
5 Error ellipse orientation, degrees from true north
6 Latitude 1 sigma error, in meters
7 Longitude 1 sigma error, in meters
8 Height 1 sigma error, in meters
9 The checksum data, always begins with *