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APPENDIX 3 DIGITAL INTERFACE
VTG - Course over ground and ground speed
$**VTG,x.x,T,x.x,M,x.x,N,x.x,K,a,*hh <CR><LF>
1 2 3 4 5 6 7 8 9
1. Course over ground, degrees (0.00 - 360.00)
2. T=True (fixed)
3. Course over ground, degrees (No use)
4. M=Magnetic (No Use)
5. Speed over ground, knots (0.00-99.94)
6. N=Knots (fixed)
7. Speed over ground (0.00-99.94)
8. K=km/h (fixed)
9. Mode indicator (A=Autonomous, D=Differential, E=Estimated (dead reckoning), M=Manual input,
S=Simulator, P=Precision)
ZDA - Time and date
$**ZDA,hhmmss.ss,xx,xx,xxxx,xx,xx<CR><LF>
1
2 3
1. UTC (000000.00 - 235960.99)
2. Day (01 - 31)
3. Month (01 -12)
4. Year (UTC, 1970 - 2037)
5. Local zone, hours (No use)
6. Loca zone, minutes (No use)
Output sentences
For ACK, ALR and HBT, see input sentences.
ABM - UAIS Addressed binary and safety related message
!**ABM,x,x,x,xxxxxxxxx,x,x.x,s--s,x,*hh<CR><LF>
1 2 3
4
1. Total number of sentences needed to transfer the message (1 - 9)
2. Message sentence number (1 - 9)
3. Message sequence identifier (0 - 3)
4. The MMSI of destination AIS unit for the ITU-R M.1371 message (9 digits)
5. AIS channel for broadcast of the radio message (0 - 3)
6. VDL message number (6 or 12), see ITU-R M.1371
7. Encapsulated data (1 - 63 bytes)
8. Number of fill-bits (0 - 5)
ALC - Cyclic alert list
$**ALC,xx,xx,xx,x.x, aaa,x.x,x.x,x.x,''''''''',*hh<CR><LF>
1 2 3 4
1. Total number of sentences this message (01 to 99)
2. Sentence number (01 to 99)
3. Sequential message identifier (00 to 99)
4. Number of alert entries (0 to 3)
5. Manufacturer mnemonic code (FEC, null)
6. Alert identifier (999 or 10001 to 10999)
7. Alert instance (null)
8. Revision counter (1 to 99)
9. Additional alert entries (see Note)
Note: Alert entry 0 - n: Each alert entry consists of
- Manufacturer Identifier (see ALF Manufactuer
- Alert Identifier (see ALF Alert identifier)
- Alert instance (see ALF instance)
- Revision counter (see ALF revision counter)
Each entry identifies a certain alert with a certain state.
It is not allowed that an alert entry is split between two ALC sentences.
AP-12
4
5 6
5 6
7 8
5
6
7
8
9
Alert entry 1
See Note
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