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MSC.1/Circ.1259 Technical Documentation (part 1) – Interim Revised
Technical Specifications for the LRIT system
MSC.1/Circ.1294 Technical Documentation (part 2)
MSC.1/Circ.1298 Guidance on the implementation of the LRIT system
Resolution MSC.275(85) Appointment of the LRIT Coordinator

Note: A full list of all documents relevant to the establishment and
implementation of LRIT can be found on the IMO public web site.

Individual Flag States are expected to publish specific regulations for the
ships on their Register providing detailed guidance on the
implementation of LRIT, including ship equipment conformance test
arrangements, plus the Application Service Provider(s) and Data Centre
chosen by the Flag concerned.

3 Shipborne Equipment
The regulations that require ships to participate in the LRIT system apply
to the following types of ships engaged on international voyages:

passenger ships, including high-speed passenger craft;
cargo ships, including high-speed craft, of 300 gross tonnage3 and
upwards; and
mobile offshore drilling units.
However, ships operating in Sea Area A4, as defined in SOLAS
regulation VI/2.1.15, must comply not later than the first survey of the
radio installation after 1 July 2009.

The “shipborne equipment” utilised for LRIT can be any communications
terminal on board the vessel that is capable of automatically transmitting
the ship’s LRIT information, without human intervention, at 6-hourly
intervals to an LRIT data centre.

In addition, the shipboard equipment must be capable of:
being configured remotely to transmit LRIT information at variable
intervals;
transmitting LRIT information on receipt of a specific request from the
shore (ie when polled); and

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