| Automatic Identification System (AIS) |
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| Primary Mission Areas: |
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| Services & Reporting: |
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| Maritime Information: |
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CLASS A AIS - SHIP STATIC AND VOYAGE RELATED DATA
Message 5
In addition, the Class A AIS unit broadcasts the following information every 6 minutes:
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Parameter
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Number of bits
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Description
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Message ID
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6
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Identifier for this Message 5
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Repeat indicator
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2
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Used by the repeater to indicate how many times a message has been repeated. Refer to §?4.6.1, Annex 2; 0-3; 0 = default; 3 = do not repeat any more
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User ID
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30
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MMSI number
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AIS version indicator
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2
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0 = station compliant with Recommendation ITU-R M.1371-1
1 = station compliant with Recommendation ITU-R M.1371-3
2-3 = station compliant with future editions
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IMO number
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30
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1-999999999; 0 = not available = default
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Call sign
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42
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7?=?6 bit ASCII characters, @@@@@@@ = not available = default
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Name
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120
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Maximum 20 characters 6 bit ASCII "@@@@@@@@@@@@@@@@@@@@" = not available = default
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Type of ship and cargo type
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8
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0 = not available or no ship = default
1-99 = as defined below
100-199 = reserved, for regional use
200-255 = reserved, for future use
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Overall dimension/
reference for position
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30
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Reference point for reported position.
Also indicates the dimension of ship (m) (see below)
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Type of electronic position fixing device
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4
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0 = undefined (default)
1 = GPS
2 = GLONASS
3 = combined GPS/GLONASS
4 = Loran-C
5 = Chayka
6 = integrated navigation system
7 = surveyed
8 = Galileo,
9-15 = not used
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ETA
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20
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Estimated time of arrival; MMDDHHMM UTC
Bits 19-16: month; 1-12; 0 = not available = default
Bits 15-11: day; 1-31; 0 = not available = default
Bits 10-6: hour; 0-23; 24 = not available = default
Bits 5-0: minute; 0-59; 60 = not available = default
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Maximum present static draught
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8
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In 1/10 m, 255 = draught 25.5 m or greater, 0 = not available = default; in accordance with IMO Resolution A.851
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Destination
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120
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Maximum 20 characters using 6-bit ASCII;
@@@@@@@@@@@@@@@@@@@@ = not available
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DTE
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1
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Data terminal equipment (DTE) ready (0 = available, 1 = not available?= default)
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Spare
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1
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Spare. Not used. Should be set to zero. Reserved for future use.
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Number of bits
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424
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Occupies 2 slots
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Type of ship
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Identifiers to be used by ships to report their type
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Identifier No.
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Special craft
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50
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Pilot vessel
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51
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Search and rescue vessels
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52
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Tugs
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53
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Port tenders
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54
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Vessels with anti-pollution facilities or equipment
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55
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Law enforcement vessels
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56
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Spare?-?for assignments to local vessels
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57
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Spare?-?for assignments to local vessels
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58
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Medical transports (as defined in the 1949 Geneva Conventions and Additional Protocols)
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59
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Ships according to RR Resolution No.?18 (Mob-83)
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?
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Identifiers to be used by ships to report their type
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Other ships
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First digit(1)
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Second digit(1)
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First digit(1)
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Second digit(1)
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1?-?Reserved for future use
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0?-?All ships of this type
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-
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0?-?Fishing
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2?-?WIG
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1?-?Carrying DG, HS, or MP, IMO hazard or pollutant category A
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-
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1?-?Towing
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3?-?See right column
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2?-?Carrying DG, HS, or MP, IMO hazard or pollutant category B
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3?-?Vessel
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2?-?Towing and length of the tow exceeds 200 m or breadth exceeds 25 m
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4?-?HSC
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3?-?Carrying DG, HS, or MP, IMO hazard or pollutant category C
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-
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3?-?Engaged in dredging or underwater operations
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5?-?See above
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4?-?Carrying DG, HS, or MP, IMO hazard or pollutant category D
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-
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4?-?Engaged in diving operations
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5?-?Reserved for future use
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-
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5?-?Engaged in military operations
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6?-?Passenger ships
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6?-?Reserved for future use
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-
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6?-?Sailing
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7?-?Cargo ships
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7?-?Reserved for future use
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-
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7?-?Pleasure craft
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8?-?Tanker(s)
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8?-?Reserved for future use
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-
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8?-?Reserved for future use
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9?-?Other types of ship
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9?-?No additional information
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-
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9?-?Reserved for future use
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(1)????? The identifier should be constructed by selecting the appropriate first and second digits.
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?
Reference point for reported position and overall dimensions of ship
(Source?: International Telecommunications Union Recommendation ITU-R M.1371-3)
External Position Fixing System (EPFS).
An EPFS can be any navigation system, receiver or integrated navigation system (INS), having an IEC 61162 interface.? On a Safety of Life at Sea (SOLAS) Convention ship the navigation system must meet IMO performance standards and be certified.? In practice most EPFS systems are currently GPS, and some GPS devices provide a dead reckoning (estimated position) mode.? The type of EPFS used is derived from IEC 61162-1 sentences GLL, VTG, GDT, and ROT from the sensor input and is transmitted by the four bit Class A Message 5 or Class B Message 19. It is understood that the overwhelming majority of EPFS sensors interfaced with AIS are GPS.? If an EPFS device is not connected to the AIS, the internal AIS GPS is used to provide position.?? The table describes fallback conditions and priority for how these positions sensors are used by AIS.
(Source International Electrotechnical Commission IEC 61993-2)
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