Trimble Outdoors SPSX51 - Manual (Page 135)

SPSx51 Modular GPS Receivers User Guide 133
NMEA-0183 Output A
VTG Track Made Good and Speed Over Ground
An example of the VTG message string is shown below, and Table A.14 describes the
message fields.
$GPVTG,,T,,M,0.00,N,0.00,K*4E
Table A.14 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 *