Trimble Outdoors SPSX51 User 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
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 *