4. INSTALLATION
VHW: Water speed and heading
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1.Heading, degrees true
2.Heading, degrees magnetic
3.Speed, knots
4.Speed, km/h
5.Checksum
VTG: Course over ground and ground speed
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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.