Long Range Identification and Tracking, an international system for tracking vessels globally, adopted by the IMO as an amendment to SOLAS. LRIT requires ships to automatically transmit their identity, position, and date/time at six-hour intervals, enabling flag states and port states to monitor vessel movements for security and safety purposes.
Also known as: Long Range Identification and Tracking.
Category: Maritime Communication
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DSCDigital Selective Calling, a semi-automated method of establishing a radio call using digital codes transmitted on VHF, MF, and HF radio frequencies.Flag SignalsA system of communication using coloured flags flown from a vessel's mast or signal halyard, each representing a letter of the alphabet, a numeral, or a specific meaning.MaydayThe internationally recognised voice radio distress signal, spoken three times at the beginning of a radio distress call to indicate that a vessel, aircraft, or person is in grave and imminent danger and requires immediate assistance.Morse CodeA communication system using sequences of short and long signals (dots and dashes) to represent letters and numbers.NAVTEXNavigational Telex, an international automated medium-frequency direct-printing service for delivery of navigational and meteorological warnings and forecasts, as well as urgent maritime safety information to ships.Pan-PanAn internationally recognised urgency signal, spoken three times at the beginning of a radio message, indicating that there is an urgent situation on board a vessel but no immediate danger to life or the vessel.
Back to DictionaryEntry updated May 2026