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15-7
VLW - Distance travelled through the water
$--VLW,x.x,N,x.x,N*hh<CR><LF>
| | | | |
| | | | +--------- 3
| | +--+----------- 2
+--+----------------- 1
1. Total cumulative distance, nautical miles
2. Distance since reset, nautical miles
3. Checksum
VTG - Course over ground and ground speed
$--VTG,x.x,T,x.x,M,x.x,N,x.x,K,a*hh<CR><LF>
| | | | | | | | | |
| | | | | | | | | +------- 6
| | | | | | | | +--------- 5
| | | | | | +--+----------- 4
| | | | +--+----------------- 3
| | +--+----------------------- 2
+--+----------------------------- 1
1. Course over ground, degrees true
2. Course over ground, degrees magnetic
3. Speed over ground, knots
4. Speed over ground, km/h
5. Mode indicator(see note)
6. Checksum
NOTE Positioning system Mode indicator:
A = Autonomous
D = Differential
E = Estimated (dead reckoning)
M = Manual input
S = Simulator
N = Data not valid
The positioning system Mode indicator field shall not be a null field.
ROT – Rate of turn
$--ROT,x.x,A*hh<CR><LF>
| | |
| | +--- 3
| +----- 2
+-------- 1
1. Rate of turn, deg/min, "-"=bow turns to port
2. Status: A=data valid, V=data invalid
3. Checksum