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TermDefinition
- Mail SailTo hoist the sails and get under way Read more
- Mainsheet TravellerThe athwartship slider to which the mainsheet tackle is made Read more
- Make FastTo secure the vessel with mooring lines to the jetty or to tie up to a buoy Read more
- MCA Agency responsible for the safety of commercial shipping. Read more
- Maritime and Coastguard Agency Agency responsible for the safety of commercial shipping. Read more
- MMSI Is a 9 digit unique number that is associated with your specific VHF installation, and really like a digital Call Sign. Think of it as a mobile(...) Read more
- Maritime Mobile Service Identity Is a 9 digit unique number that is associated with your specific VHF installation, and really like a digital Call Sign. Think of it as a mobile(...) Read more
- Maritime Safety Information Maritime Safety Information (MSI) is defined in the Safety of Life at Sea (SOLAS) Convention, Chapter IV as "navigational and meteorological(...) Read more
- MarkAn object that marks a position Read more
- Mast A mast is a tall, vertical spar or pole on a sailing vessel that supports the sails and rigging. Masts are typically made of wood, metal, or(...) Read more
- Mast StepFitting into which the mast heel fits Read more
- Masthead light A white, forward facing light exhibited near the masthead by a power-driven vessel underway. Read more
- MayDayDistress call made when vessel or life is in serious and imminent danger. From the French, M’aider. Read more
- Mean High Water Neaps 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(...) Read more
- 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(...) Read more
- MHWS Mean High Water Springs (MHWS) is a tidal datum representing the average height of the high water level during spring tides over a specific(...) Read more
- Mean High Water Springs Mean High Water Springs (MHWS) is a tidal datum representing the average height of the high water level during spring tides over a specific(...) Read more
- MLWN Mean Low Water Neaps (MLWN) is a tidal datum representing the average lowest water level during neap tides. Neap tides occur when the(...) Read more
- Mean Low Water Neaps Mean Low Water Neaps (MLWN) is a tidal datum representing the average lowest water level during neap tides. Neap tides occur when the(...) Read more
- MLWS Mean Low Water Springs (MLWS) refers to the average sea level during low tide under the gravitational influence of the combined forces of the(...) Read more