Clasification Society Rulefinder 2016 - Version 9.25
Statutory Documents - IMO Publications and Documents - Resolutions - Assembly - IMO Resolution A.917(22) – Guidelines for the Onboard Operational Use of Shipborne Automatic Identification Systems (AIS) – (Adopted on 29 November 2001) - Annex - Guidelines for the Onboard Operational use of Shipborne Automatic Identification Systems (AIS) - Operation of AIS on Board - Display of AIS Data

Display of AIS Data

  27. The AIS provides data that can be presented on the minimum display or on any suitable display device as described in annex 1.

  Minimum display

  28. The minimum mandated display provides not less than three lines of data consisting of bearing, range and name of a selected ship. Other data of the ship can be displayed by horizontal scrolling of data, but scrolling of bearing and range is not possible. Vertical scrolling will show all the other ships known to the AIS.

  Graphical display

  29. Where AIS information is used with a graphical display, the following target types are recommended for display:

Sleeping target A sleeping target indicates only the presence of a vessel equipped with AIS in a certain location. No additional information is presented until activated, thus avoiding information overload.
Activated target If the user wants to know more about a vessel’s motion, he has simply to activate the target (sleeping), so that the display shows immediately:
  • a vector (speed and course over ground),
  • the heading, and
  • ROT indication (if available) to display actually initiated course changes.
Selected target If the user wants detailed information on a target (activated or sleeping), he may select it. Then the data received, as well as the calculated CPA and TCPA values, will be shown in an alpha-numeric window.
  The special navigation status will also be indicated in the alpha numeric data field and not together with the target directly.
Dangerous target If an AIS target (activated or not) is calculated to pass pre-set CPA and TCPA limits, it will be classified and displayed as a dangerous target and an alarm will be given.
Lost target If a signal of any AIS target at a distance of less than a preset value is not received, a lost target symbol will appear at the latest position and an alarm will be given.

  Symbols

  30. The user should be familiar with the symbology used in the graphical display provided.

Parent topic: Operation of AIS on Board
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