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APPENDIX
A
P-21
VDM - VHF data-link message
!--VDM,x,x,x,a,s--s,x*hh<CR><LF>
| | | | | | |
| | | | | | +--- 7
| | | | | +----- 6
| | | | +-------- 5
| | | +------------ 4
| | +-------------- 3
| +---------------- 2
+------------------ 1
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
4. AIS channel
5. Encapsulated ITU-R M.1371 radio message
6. Number of fill-bits, 0 to 5
7. Checksum
VDO - UAIS VHF data-link own-vessel report
!--VDO,x,x,x,a,s--s,x*hh<CR><LF>
| | | | | | |
| | | | | | +--- 7
| | | | | +----- 6
| | | | +-------- 5
| | | +------------ 4
| | +-------------- 3
| +---------------- 2
+------------------ 1
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
4. AIS channel
5. Encapsulated ITU-R M.1371 radio message
6. Number of fill-bits, 0 to 5
7. Checksum