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Appendix 5: Digital Interface
AP-63
VTG - Course over ground and ground speed
Recipient of sentences:
Expected nominal interval of sentences: 1 - 5 s
Alarm generated if message not received: 22 s ± 2 s
$--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.
Data shown in green in case of A and D; no indication in case of E,
M, S and N.
ZDA - Time and date
Recipient of sentences:
Expected nominal interval of sentences: 5 s
$--ZDA,hhmmss.ss,xx,xx,xxxx,xx,xx*hh<CR><LF>
| | | | | | |
| | | | | | +--------- 7
| | | | | +----------- 6
| | | | +-------------- 5
| | | +------------------ 4
| | +---------------------- 3
| +------------------------- 2
+--------------------------------- 1
1. UTC
2. Day, 01 to 31 (UTC)
3. Month, 01 to 12 (UTC)
4. Year (UTC)
5. Local zone hours, 00h to +-13h
6. Local zone minutes, 00 to +59
as local hours
7. Checksum