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AIS. Automatic Identification System. Automatic Identification System (AIS) enables automatic identification of ships from other ships and from shore-based stations AIS uses a VHF transponder for transmission of identification and navigational information from ship-to-ship and ship-to-shore

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AIS

Automatic Identification System

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Automatic Identification System (AIS) enables automatic identification of ships from other ships and from shore-based stations
  • AIS uses a VHF transponder for transmission of identification and navigational information from ship-to-ship and ship-to-shore
  • AIS-equipped ships are able to identify and track each other independetly of shore-based stations: it is a global system (UAIS)
  • AIS-equipped shore-stations will use the system to monitor traffic and poll AIS-equipped ships
what is ais
What is AIS:
  • AIS-equipped ships will continuosly transmit and receive short messages containing:
    • static information about the ship
    • dynamic navigational information
    • Voyage-related information
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STATIC: DYNAMIC: VOYAGE RELATED:
  • IMO number Position Draught
  • Call sign / Name UTC Hazard type
  • Lenght / Beam Course ETA / Destination
  • Type of ship Speed Route
  • GPS Antenna location Navigation Status
  • Heading
  • Rate of turn
  • Keel
  • Pitch / Roll
received information will be displayed on
Received information will be displayed on:
  • Keyboard Display Unit
  • PC, ECS, ECDIS
  • ARPA radars
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AIS-equipped ships will be able to exchange SMS messages ship-to-shore
  • AIS-equipped ships will automaticly receive SMS messages from shore-stations with information as:
    • weather forecast, tides and currents
    • port dana, berth assignments
    • Shipping agency information etc.
purpose of ais
Purpose of AIS:
  • Improve situational awarness on board ships in order to prevent accidents and maritime disasters by means of:
    • automatic swap of navigational information on ship’s movements to predict situations
    • automatic swap of static information to facilitate ship-to-ship communication
    • Interface to ship’s navigational equipment to increase information value
advantages of ais
Advantages of AIS:

For the Officer of the Watch:

  • Unambiguous identification of radar targets
  • Real time information on other ship’s movements
  • Detection of vessels behind bends or obstacles
  • Elimination of problem with target swapping
  • VHF radio contact with other ships
  • Reduction of VHF voice traffic by means of SMS messages
advantages of ais1
Advantages of AIS:

For Shore Stations / VTS Centres:

  • Automatic identification of radar targets
  • Improved coverage when radar picture is degraded
  • Tracking of vessels behind obstacles
  • Tracking of dangerous / pulluting cargos
  • Automatic broadcasting of traffic / weather information to all ships in the area
imo carriage requirement for solas ships
IMO carriage requirement for SOLAS Ships

SOLAS V, Safety of Navigation, Regulation 19, Chapter 1.5

  • All ships of 300 gross tonnage and upwards engaged on international voyages
  • Cargo ships of 500 gross tonnage and upwards not engaged on international voyages
  • Passenger ships irrespective of size

The Administrations may exempt ships wich will be taken permanently out of service within two years after the specified implementation date

retrofits
Retrofits:
  • Ships constructed on or after 1 July 2002
  • Ships engaged on international voyages constructed before 1 July 2002;

-In the case of passenger ships irrespective of size and tankers of all sizes, not later than 1 July 2003;

-In the case of ships, other than passenger ships and tankers, of 50 000 gross tonnage and upwards, not later than 1 July 2004;

-In the case of ships, other than passenger ships and tankers, of 300 gross tonnage and upwards but less than 50 000 gross tonnage, not later than the first safety equipment survey after 1 July 2004 or by 31 December 2004, which ever occurs earlier

Ships not engaged on international voyages constructed before 1 July 2002, not later than 1 July 2008.

٭The administration can implement regulation, on national basis, in advance of deadline.

ais frequencies
AIS Frequencies:

Frequencies to be used for the universal ship borne AIS been defined in ITU.R.M.1084-3:

  • 161.975 MHz/Channel 87B and
  • 162.025 MHz/Channel 88B

In areas where the designed AIS channels are not available, the transponder must be able to be switched to alternative channels, by message received on DSC channel 70.

modes of operation
Modes of Operation:
  • Autonomous: The transponder determines its own schedule for ship-to-ship transmission.
  • Assigned: The transponder uses a transmission schedule assigned by a competent authority’s shore-station, e.g. in crowded areas.
  • Polled: The transponder automatically respons to interogation messages from a competent authority, e.g. a VTS Control Centre.
information update rates for autonomous mode
Information Update Rates for Autonomous Mode:
  • Static information: Every 6 min. / when dana has been amended / on request.
  • Dynamic information: Dependent on speed and course alteration.
  • Voyage-related information:Every 6 min. / when dana has been amended / on request.
  • Safety-related message: As required.
class a ship borne mobile equipment reporting intervals for dynamic information
Class A Ship Borne Mobile Equipment Reporting Intervals for Dynamic Information
  • Ship at anchor 3 minutes
  • Ship 0-14 knots 10 seconds
  • Ship 0-14 knots and changing course 3 1/3 seconds
  • Ship 14-23 knots 6 seconds
  • Ship 14-23 knots and changing course 2 seconds
  • Ship > 23 knots 2 seconds
  • Ship > 23 knots and changing course 2 seconds
mandatory ship repotring system in the adriatic sea
Mandatory Ship Repotring System in the Adriatic Sea

Categories of ships required to participate in the system:

  • All oil tanker ships of 150 GT and above;
  • All ships of 300 GT and above, carrying on bord, as cargo, dangerous or polluting goods, in bulk or in packages
new traffic separation schemes in the adriatic sea
NEW TRAFFIC SEPARATION SCHEMES IN THE ADRIATIC SEA
  • Adopted in accordance with the provisions of the resolution A.858(20)
  • Categories of the ships required to participate in the system:
    • routeing systems are recomended for all ships and should be used in accordance with the General Provisions on Ship’s Routeing, as amended.