Transas Class B - VHF Data Link Own Vessel Messages (NMEA 0183 VDO); Regional Assignment Channel Assignment Message (NMEA 0183 ACA)

LD2103 V3.0 Page 18 of 33
SRT Marine
Instruction Manual
SRT-MTB
©
Class B Marine AIS
VDL Message number VDM Message description
17 DGNSS corrections (INFO)
20 data link management (INFO)
22 channel management (INFO)
*Note that messages 5 and 19 may be sent as multi part messages.
VHF data link own vessel messages (NMEA 0183 VDO)
This message describes the own vessel message being sent.
VDO Message Format
!--VDO,x1,x2,x3,a,s--s,x*hh<CR><LF>
Where
•
x1 = Total number of sentences needed to transfer the message , 1 to 9
•
x2 = Sentence number, 1 to 9
•
x3 = Sequential message identifier, 0 to 9
•
a = AIS Channel, "A" or "B"
•
s - - s = Encapsulated ITU-R M.1371 radio message 4
•
x = Number of fill-bits , 0 to 5
VDO Message number VDO Message description
AIS Target Display Information
13 Safety Related Acknowledgement
18 Standard Class B position report (Includes MMSI, SOG, position accuracy, lat, long,
COG, true heading,)
24a Class B “CS” Static data Part A (Includes MMSI and vessel name)
24b Class B “CS” Static data Part B (MMSI, ship type, cargo type, call sign, ship dimensions)
Regional Assignment Channel Assignment Message (NMEA 0183 ACA)
An TRANSAS AIS CLASS B unit can receive regional channel management information in two ways: ITU-R M.1371 message
22 or a DSC telecommand received on channel 70,
ACA Message Format
$--ACA,x,llll.ll,a,yyyyy.yy,a,llll.ll,a1,y1y1y1y1y.y1y1,a2,x1,x2x2x2x2,x3,x4x4x4x4,x5,x6,x7,a3,x8,hhmmss.ss*hh
<CR><LF>
Where
•
x = Sequence Number , 0 to 9
•
IIII, II, a = Region Northeast corner latitude – N/S
•
yyyyy.yy,a1 = Region Northeast corner longitude – E/W
•
llll.ll,a = Region Southwest corner latitude – N/S
•
y1y1y1y1y1.y1y1,a2 = Region Southwest corner longitude – E/W
•
x1 = Transition Zone Size
•
x2x2x2x2 = Channel A