Definition
Established under SOLAS Chapter V Regulation 19-1 and applying to passenger ships, cargo ships of 300 gross tonnage and upwards on international voyages and mobile offshore drilling units. Equipment transmits identity, position and time normally four times a day via satellite communications to a data centre. Unlike AIS the reports are not broadcast openly, access being restricted to flag, port and coastal states within defined distances, which makes LRIT a security and SAR tool rather than a collision avoidance aid.
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