Technical reference
Page 62
6.8.1
ABM - Addressed binary and safety related message
This sentence allows external applications to transmit binary and safety messages using the AIS transceiver
via AIS messages 6 and 12.
6.8.2
ACA - AIS regional channel assignment message
This sentence is used to both enter and obtain channel management information.
!--ABM,x,x,x,xxxxxxxxx,x,x.x,s--s,x*hh<CR><LF>
Field
number
Description
1
x =
Total number of sentences needed to transfer the message
2
x =
Sentence number
3
x =
Sequential Message identifier
4
xxxxxxxxx =
The MMSI of destination AIS transceiver for the ITU-R M.1371 message
5
x =
AIS channel for broadcast of the radio message
6
x.x =
ITU-R M.1371 message ID
7
s--s =
Encapsulated data
8
x =
Number of fill-bits, 0-5
$--ACA,x,llll.ll,a,yyyyy.yy,a,llll.ll,a,yyyyy.yy,a,x,xxxx,x,xxxx,x,x,x,a,x,hhmmss.ss*hh<CR><LF>
Field
number
Description
1
x =
Sequence Number, 0 to 9
2
llll.ll,a =
Region Northeast corner latitude - N/S
3
yyyyy.yy,a =
Region Northeast corner longitude - E/W
4
llll.ll,a =
Region Southwest corner latitude - N/S
5
yyyyy.yy,a =
Region Southwest corner longitude - E/W
6
x =
Transition Zone Size
7
xxxx =
Channel A
8
x =
Channel A bandwidth
9
xxxx =
Channel B
10
x =
Channel B bandwidth
11
x =
Tx/Rx mode control
12
x =
Power level control
13
a =
Information source
14
x =
In-Use Flag
15
hhmmss.ss =
Time of “in-use” change
