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TermDefinition
- 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
- Mean Low Water Springs 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
- Phonetic Alphabet Mike Phonetic alphabet letter M. Stationary Vessel: When a vessel displays the Mike flag, it indicates that it is not moving under its own(...) Read more
- MistVisibility reduced to between 0.5 and 2 nautical miles due to suspension of water particles in the air Read more
- Mizzen MastMast aft of the mainmast, on a ship. Read more
- MoleA breakwater made of stone or concrete Read more
- MonohullA vessel with a single hull Read more
- Mooring BuoyA non-navigational buoy to which a vessel can moor Read more
- Mooring RingA ring on a mooring buoy Read more
- Motor sailing A sailing vessel making way using sails and engine. A downward pointing cone should be displayed in the fore triangle in daylight and lights(...) Read more