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TermDefinition
- Magnetic NorthThe area of the globe where compasses point, it's a variable location moving each year. See also Variation & True North Read more
- Mail SailTo hoist the sails and get under way Read more
- MainsailThe principal sail 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
- Making Way A vessel being propelled through the water by its own means, engine or sail. Read more
- MarinaArtificial boat harbour usually consisting of pontoons 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
- 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
- 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 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
- MastThe most important vertical spar without which no sail can be set 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
- 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