User's Manual

A NMEA-0183 Output
130 SPSx50 Modular GPS Receiver User Guide
VTG Over Ground and Speed Over Ground or Track Made Good and Speed Over
Ground
An example of the VTG message string is shown below. Tab le A .1 6 describes the
message fields.
$GPVTG,,T,,M,0.00,N,0.00,K*4E
Table A.16 VTG message fields
Field Meaning
0 message ID $GPVTG
1 Track made good (degrees true)
2 T: track made good is relative to true north
3 Track made good (degrees magnetic)
4 M: track made good is relative to magnetic north
5 Speed, in knots
6 N: speed is measured in knots
7 Speed over ground in kilometers/hour (kph)
8 K: speed over ground is measured in kph
9 The checksum data, always begins with *