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 - Operation of the Transceiver Unit
Operation of the Transceiver Unit
Activation
21. AIS should always be in operation when ships are underway or at anchor. If the master believes that the continual operation of AIS might compromise the safety or security of his/her ship or where security incidents are imminent, the AIS may be switched off. Unless it would further compromise the safety or security, if the ship is operating in a mandatory ship reporting system, the master should report this action and the reason for doing so to the competent authority. Actions of this nature should always be recorded in the ship’s logbook together with the reason for doing so. The master should however restart the AIS as soon as the source of danger has disappeared. If the AIS is shut down, static data and voyage related information remains stored. Restart is done by switching on the power to the AIS unit. Ship’s own data will be transmitted after a two minute initialization period. In ports AIS operation should be in accordance with port requirements.
Manual input of data
22. The OOW should manually input the following data at the start of the voyage and whenever changes occur, using an input device such as a keyboard:
- ship’s draught;
- hazardous cargo;
- destination and ETA;
- route plan (way points);
- the correct navigational status; and
- short safety-related messages.
Check of information
23. To ensure that own ship’s static information is correct and up-to-date, the OOW should check the data whenever there is a reason for it. As a minimum, this should be done once per voyage or once per month, whichever is shorter. The data may be changed only on the authority of the master.
24. The OOW should also periodically check the following dynamic information:
- positions given according to WGS 84;
- speed over ground; and
- sensor information.
25. After activation, an automatic built-in integrity test (BIIT) is performed. In the case of any AIS malfunction an alarm is provided and the unit should stop transmitting.
26. The quality or accuracy of the ship sensor data input into AIS would not however be checked by the BIIT circuitry before being broadcast to other ships and shore stations. The ship should therefore carry out regular routine checks during a voyage to validate the accuracy of the information being transmitted. The frequency of those checks would need to be increased in coastal waters.
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