NMEA-0183 message: VTG

Related Topics

Track made good and speed over ground

An example of the VTG message string is:

$GPVTG,,T,,M,0.00,N,0.00,K*4E

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 *