NMEA-0183 message: VTG
Track made good and speed over ground
NOTE – The heading computation in this message is derived from consecutive positions. For heading using a moving baseline system, see NMEA-0183 message: PTNL,AVR.
An example of the VTG message string is:
$GPVTG,140.88,T,,M,8.04,N,14.89,K,D*05
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 |
Mode indicator: A: Autonomous mode |
|
10 |
The checksum data, always begins with * |