Haicom HI-405BT - Manual (Page 28)

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VTG - COURSE OVER GROUND AND GROUND SPEED
Velocity is given as course over ground (COG) and speed over
ground (SOG).
Format:
GPVTG,<1>,T,<2>,M,<3>,N,<4>,K,<5>*<6><CR><LF>
Example:
$GPVTG,221.0,T,224.3,M,016.0,N,0029.6,K,A*1F<CR><LF>
Field
1
2
3
4
5
6
Example
221.0
224.3
016.0
0029.6
A
1F
Description
True course over ground,
000.0 ~ 359.9 degrees
Magnetic course over ground,
000.0 ~ 359.9 degrees
Speed over ground,
000.0 ~ 999.9 knots
Speed over ground,
0000.0 ~ 1800.0 kilometers per hour
Mode indicator
'N' = Data invalid
'A' = Autonomous
'D' = Differential
'E' = Estimated
Checksum