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$GPVTG
The response message is in the form:
Table 6.86 outlines the VTG structure.
Field
M
Example:
Table 6.87 outlines the example VTG response message.
$GPVTG
179.21
T
193.44
M
000.11
N
000.20
Command/Response Formats
$GPVTG,f1,T,f2,M,f3,N,f4,K
Table 6.86: VTG Structure
f1
True track/true course over ground, ttt.tt = 000.00 to 359.99 degrees
T
T = true course
f2
Magnetic track/magnetic course over ground, (000.00 to 359.99) degrees.
(Output only if magnetic variation option (M) is installed in receiver)
Magnetic course over ground marker, M = magnetic course
f3
Speed over ground, 000 to 999.99 knots
N
Speed over ground units, N = nautical miles per hour
f4
Speed over ground, = 000 to 999.99 kilometers per hour
K
Speed over ground units, = K (kilometers per hour)
Query:$PASHQ,VTG,B or
Set: $PASHS,NME,VTG,A,ON
Typical Response:$GPVTG,179.21,T,1934.4,M,000.11,N,000.20,K*3E
Table 6.87: Typical VTG Response Message
Item
Header
Course over ground in degrees
True course over ground marker
Magnetic course over ground
Magnetic course over ground marker
Speed over ground in knots
Knots
Speed over ground in kilometers/hour
Description
Description
173
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