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APPENDIX 3 DIGITAL INTERFACE
!AIVDO,x,x,x,x,s--s,x,*hh<CR><LF>
1 2 3 4 5 6
1. Total number of sentences needed to transfer the message (1 to 9)
2. Message sentence number (1 to 9)
3. Sequential message identifier (0 to 9, NULL)
4. AIS channel Number (A or B, NULL)
5. Encapsulated ITU-R M.1371 radio message (1 - 63 bytes)
6. Number of fill-bits (0 to 5)
VDR - Set and drift
$**VDR,x.x,T,x.x,M,x.x,N,*hh <CR><LF>
1 2 3 4 5 6
1. Direction, degrees (0.00 - 360.00, null)
2. T=True (fixed)
3. Direction, degrees (0.00 - 360.00, null)
4. M=Magnetic (fixed)
5. Current speed (0 - 99.99)
6. N=Knots (fixed)
VHW - Water speed and headings
$**VHW,x.x,T,x.x,M,x.x,N,x.x,K,*hh <CR><LF>
1 2 3 4 5 6 7 8
1. Heading, degrees (No use)
2. T=True (fixed, No use)
3. Heading, degrees (No use)
4. M=Magnetic (fixed, No use)
5. Speed, knots (0.00 - 99.94)
6. N=Knots (fixed)
7. Speed, knots (0.00 - 99.94)
8. K=km/hr (fixed)
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
AP-28
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