AIS Message Definitions

AIS Message: SARposition (::)

Description:

Search and rescue position report

Name NumberOfBits ArrayLength Type Units Description
MessageID 6 uint AIS message number. Must be 9
RepeatIndicator 2 uint Indicated how many times a message has been repeated
0: default
3: do not repeat any more
UserID 30 uint Unique ship identification number (MMSI)
Altitude 12 uint meters Altitude (GNSS)
4095: 4095 or higher
SOG 10 udecimal knots Speed over ground
102.2: 102.2 knots or higher
PositionAccuracy 1 uint Accuracy of positioning fixes
0: low (greater than 10 m)
1: high (less than 10 m)
Position_longitude 28 decimal degrees Location of the vessel East West location
Position_latitude 27 decimal degrees Location of the vessel North South location
COG 12 udecimal degrees Course over ground
TimeStamp 6 uint seconds UTC second when the report was generated
60: not available/default
61: manual input
62: dead reckoning
63: inoperative
Reserved 8 uint Reserved for regional applications. Should be set to zero.
DTE 1 bool Dtta terminal ready
Spare 5 uint Not used. Should be set to zero.
RAIM 1 bool Receiver autonomous integrity monitoring flag
False: not in use
True: in use
state_syncstate 2 uint Communications State - SOTDMA Sycronization state
0: UTC direct
1: UTC indirect
2: synchronized to a base station
3: synchronized to another station
state_slottimeout 3 uint frames Communications State - SOTDMA Frames remaining until a new slot is selected
0: Last frame in this slot
1: 1 frames left
2: 2 frames left
3: 3 frames left
4: 4 frames left
5: 5 frames left
6: 6 frames left
7: 7 frames left
state_slotoffset 14 uint Communications State - SOTDMA In what slot will the next transmission occur. BROKEN