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Distinguish devices, alerting systems and identifiers. Similar acronyms do not mean interchangeable functions, and a definition does not establish the equipment required for a particular trip.
Safety equipment guides →MarineBrands editorial definitions · Reviewed 5 October 2026 · Examples explain context, not operating procedures.
12 of 12 terms
Also find under: man overboard beacon person overboard beacon
An AIS-based person-overboard locating device that broadcasts to compatible nearby receiving equipment.
An AIS locating function is distinct from satellite distress alerting; some products combine functions.
Also find under: digital selective calling
Digital Selective Calling: a system for sending digital calls, including distress alerts, over marine radio.
A DSC-capable radio still needs the appropriate setup, position input and user knowledge.
Also find under: emergency position indicating radio beacon
Emergency Position Indicating Radio Beacon: a maritime distress beacon designed for vessel use.
Check the exact model, registration and applicable carriage requirements; brand names alone do not establish suitability.
A lifejacket whose buoyancy depends on inflation of a chamber by its specified mechanism.
Inspection, servicing and rearming requirements depend on the exact model and use.
Also find under: engine stop lanyard safety lanyard
A cord linking an operator to an engine-stop arrangement so separation can trigger the stop function.
Fit and use the actual craft’s system according to its instructions; this definition is not a substitute for that procedure.
Wearable flotation equipment designed to help support a person in the water under its specified performance class.
Choose and maintain the appropriate type and fit; a glossary cannot determine the legal requirement for every activity.
Also find under: maritime mobile service identity
Maritime Mobile Service Identity: an identifying number used in maritime radio and related systems.
Use the correct assigned identity when configuring eligible equipment; do not invent a number.
Also find under: personal flotation device
Personal flotation device, a broad term used for wearable flotation equipment.
Check the actual standard, performance level and intended use rather than relying on the acronym alone.
Also find under: personal locator beacon
Personal Locator Beacon: a portable distress beacon intended to be carried by an individual.
A PLB is not automatically an acceptable replacement for a vessel’s required EPIRB.
Also find under: personal watercraft jet ski jetski
Personal watercraft: a compact powered craft generally ridden on, rather than within, a conventional hull cockpit.
Jet Ski is a Kawasaki brand name, while PWC is the broader category used across brands.
Also find under: very high frequency marine radio
Very High Frequency: a radio-frequency band used for marine communications.
A marine VHF set and a mobile phone use different systems; one label does not establish coverage for a trip.
Also find under: jet drive
A propulsion system that accelerates water through a pump and nozzle to generate thrust.
A waterjet craft’s handling and maintenance differ from a propeller-driven installation; use model-specific instruction.
Original concise explanations for equipment research. Use these specialist resources for the wider technical context and the relevant current documentation for a particular product or activity.
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