5.2 LD8 output sentences
5.2.6 VTG sentence
The NMEA VTG sentence provides the actual course and speed relative to the ground.
VTG sentence structure & example
$GNVTG, ppp.ppp, T, qqq.qgg, M, rr.rrr, N, ss.sss, K, U, *hh
$GNVTG, 167.608, T, 167.608, M, 0.006, N, 0.012, K, D, *3D
VTG sentence defined
Field Content
VTG Course over ground and ground speed
ppp.ppp True course over ground
T Degrees True indicator
qqq.qgg Magnetic course over ground
M Degrees Magnetic
rr.rrr Speed over ground, knots
N Nautical speed indicatior (N = Knots)
ss.sss Speed over ground, kilometres/hour
K Speed indicator (K = km/hr)
U
Positioning mode indicator (A = Autonomous, D = Differential,
E = Estimated (Dead reckoning), M = Manual, N = Data not valid)
*hh Checksum
45
LD8 Operations Manual
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