Glossary
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TermDefinition
- Abbreviation, General Nautical Terminology, Navigation MHWN
The average height of high tides during neap tide cycles, which occur when the tidal range is at its smallest.
Mean High Water Neaps (MHWN) is...
More Details - Abbreviation, General Nautical Terminology, Navigation MHWS
The average height of the high waters that occur during spring tides, calculated over a specific period of time.
Mean High Water Springs...
More Details - Phonetic Alphabet, Signals & Communication Mike
Pronounced: MIKE
The term for the letter M in the NATO Phonetic Alphabet.
- General Nautical Terminology MistVisibility reduced to between 0.5 and 2 nautical miles due to suspension of water particles in the air
- General Nautical Terminology, Weather (Meteorology) Mistral
A strong, cold, and dry northwesterly katabatic wind that blows from southern France into the Mediterranean, particularly affecting the Gulf of...
More Details - General Nautical Terminology Mizzen MastMast aft of the mainmast, on a ship.
- Flag Semaphore, Signals & Communication Letter M (Flag Semaphore)

Flag semaphore indicating the letter M.
- Morse Code, Signals & Communication Letter M (Morse Code)
International Morse Code sequence representing the letter M.
- Abbreviation, General Nautical Terminology, Navigation MLWN
The average height of low tides during neap tide cycles, which occur when the tidal range is at its smallest due to the reduced gravitational...
More Details - Abbreviation, General Nautical Terminology, Navigation MLWS
The average level of the lowest low tides that occur during spring tide conditions, calculated over a standard period of time.
Mean Low Water...
More Details - General Nautical Terminology, Safety 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 Mole
A solid structure, often made of stone or concrete, built to protect a harbour, anchorage, or shoreline from the effects of waves and currents,...
More Details - General Nautical Terminology MonohullA vessel with a single hull
- General Nautical Terminology Mooring
A permanent structure or equipment, such as a buoy, anchor, or dock, used to secure a vessel in place or the act of securing a vessel to a fixed...
More Details - General Nautical Terminology Mooring Buoy
A non-navigational floating device anchored to the seabed, used for securing vessels in place without the need for traditional anchoring.
A...
More Details - General Nautical Terminology Mooring RingA ring on a mooring buoy
- General Nautical Terminology 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 for...
More Details - General Nautical Terminology MRCC
A shore-based facility responsible for coordinating and managing maritime search and rescue (SAR) operations within a designated area of...
More Details - Courses, RYA Multihull Club RacingThe RYA Multihull Club Racing course prepares sailors to participate in local club races with confidence. The course covers race rules, starting... More Details
- Courses, RYA Multihull Day SailingThe RYA Multihull Day Sailing course prepares sailors to undertake safe and enjoyable day trips on multihulls. Participants learn about trip... More Details

