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Misuse of Automatic Identification System

Marine Notice 12/2005

The purpose of this notice is to draw the attention of shipmanagers, shipmasters and watch-keepers to the growing evidence of the use of the Short Safety Related Message (SSRM) functionality of AIS for purposes other than safety of navigation.

There have been numerous reported instances of the use of this feature of AIS for general communication between ships and between ships and shore.

The IMO guidance for on-board operational use of AIS clearly states that the content of these messages should be relevant to the safety of navigation (e.g. sighting of an iceberg or a buoy not on station).

In particular, care must be taken to avoid relying on such messages when a close quarters situation is developing. There is no guarantee that receiving vessels will be able to readily display such messages.

When used, such messages should be kept as short as possible. Although the system allows up to 162 characters of text per message, shorter messages will find free space for transmission more easily. Further, longer messages will increase the load on the VHF data link, thereby potentially compromising the operation of AIS.

Mariners are also reminded that the SSRM is only an additional means of broadcasting Maritime Safety Information (MSI). Whilst their importance should not be underestimated, the use of such messages does not remove the requirements for promulgation of MSI under Global Maritime Distress and Safety System (GMDSS).

Shipmanagers, shipmasters and watch-keepers are strongly advised to ensure that their ships use the SSRM functionality of AIS for safety of navigation purposes only.

During a port State control inspection, AMSA surveyors may ask shipmasters and watch-keepers to demonstrate their understanding of SSRM and its intended use.

David Baird
Acting Chief Executive Officer
18 November 2005

Australian Maritime Safety Authority
GPO Box 2181, Canberra City ACT 2601

File No: 000011-07
Term of Validity: Routine
Internet Address for all current Marine Notices: www.amsa.gov.au