Glossary
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TermDefinition
- Organisation Maritime and Coastguard Agency (MCA)
The Maritime and Coastguard Agency (MCA) is a UK government agency responsible for implementing maritime safety and environmental policies. It...
More Details - General Nautical Terminology, Safety Maritime Mobile Service Identity (MMSI)
A unique nine-digit number assigned to a vessel, coast station, or group of stations for digital communication and identification in the Global...
More Details - General Nautical Terminology Maritime Rescue Coordination Centre (MRCC)
A shore-based facility responsible for coordinating and managing maritime search and rescue (SAR) operations within a designated area of...
More Details - General Nautical Terminology, Navigation Maritime Safety Information
Defined in the Safety of Life at Sea (SOLAS) Convention, Chapter IV as "navigational and meteorological warnings, meteorological forecasts and...
More Details - General Nautical Terminology MarkAn object that marks a position
- General Nautical Terminology MARPOL
Established by the IMO, MARPOL is the convention for preventing pollution from ships. It is the main international convention covering the...
More Details - General Nautical Terminology Mast
A tall vertical spar or structure on a sailing vessel that supports the sails, rigging, and sometimes navigation equipment.
A mast is one of...
More Details - General Nautical Terminology Masthead light
A white, forward facing light exhibited near the masthead by a power-driven vessel underway.
- General Nautical Terminology Mast StepFitting into which the mast heel fits
- General Nautical Terminology, Safety, Signals & Communication MayDay
An internationally recognised distress signal used in voice communication to indicate a grave or imminent, life-threatening emergency at...
More Details - Organisation MCA
The Maritime and Coastguard Agency (MCA) is a UK government agency responsible for implementing maritime safety and environmental policies. It...
More Details - Flag / Pennant, Signals & Communication Code Flag Mike (M)
The International Maritime Signal Flag Mike.
Meaning
My vessel is stopped and making no way through the water.
- General Nautical Terminology Mean High Water Neaps (MHWN)
Mean High Water Neaps (MHWN) refers to the average height of the higher of the two daily high tides that occur during neap tides. Neap tides...
More Details - General Nautical Terminology, Navigation Mean High Water Springs (MHWS)
A tidal datum representing the average height of the high water level during spring tides over a specific period, typically measured over a...
More Details - General Nautical Terminology Mean Low Water Neaps (MLWN)
Mean Low Water Neaps (MLWN) is a tidal datum representing the average lowest water level during neap tides. Neap tides occur when the...
More Details - General Nautical Terminology, Safety MEDILINK
A communication made via radio from a vessel to a shore-based medical facility or professional to seek urgent medical advice or assistance for an...
More Details - General Nautical Terminology Medium Frequency (MF)
The range of radio frequencies between 300 kHz and 3 MHz, commonly used in marine communication and navigation systems.
Medium Frequency (MF)...
More Details - General Nautical Terminology MF
The range of radio frequencies between 300 kHz and 3 MHz, commonly used in marine communication and navigation systems.
Medium Frequency (MF)...
More Details - General Nautical Terminology MHWN
Mean High Water Neaps (MHWN) refers to the average height of the higher of the two daily high tides that occur during neap tides. Neap tides...
More Details - General Nautical Terminology, Navigation MHWS
A tidal datum representing the average height of the high water level during spring tides over a specific period, typically measured over a...
More Details