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.
ZDA - Time and date
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1.UTC
2.Day, 01 to 31(UTC)
3.Month, 01 to 12(UTC)
4.Year(UTC)
5.Local zone hours, 00h to
6.Local zone minutes, 00 to +59 as local hours
7.Checksum
31