Smiths Kelvin Hughes Nucleus 3 5000 Series, System Handbook

Page: 444 / 510

AIS MESSAGES
VDM - AIS VHF Data Link Mes sage
This sentence is used to transfer the entire contents of a
received AIS message packet, as defined in ITU-R
M.1371 and as received on the VHF Data Link (VDL),
using the 'six-bit' field type. The structure provides for the
transfer of long binary messages by using multiple
sentences.
!--VDM,x,x,x,a,s--s,x*hh<CR><LF>
Checksum
Number of fill bits, 0 to 5
Encapsulated ITU-R M.1371
radio message
AIS Channel
Sequential Message Identifier, 0 to 9
Sentence Number, 1 to 9
Total Number of Sentences needed to transfer
the message, 1 to 9
VDO - AIS VHF Data-link Own-ves sel re port
This sentence is used to transfer the entire contents of an
AIS unit's broadcast message packet, as defined in ITU-R
M.1371 and as sent out by the AIS unit over the VHF Data
Link (VDL) using the 'Six-bit' field type. The sentence uses
the same structure as the VDM sentence formatter.
!--VDO,x,x,x,a,s--s,x*hh<CR><LF>
Checksum
Number of fill bits, 0 to 5
Encapsulated ITU-R M.1371
radio message
AIS Channel
Sequential Message Identifier, 0 to 9
Sentence Number, 1 to 9
Total Number of Sentences needed to transfer
the message, 1 to 9
Amdt 5 8aA.15 July 03
KH 2020
Chap 8a - Annex A