Glossary
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TermDefinition
- 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 sea.
More Details - General Nautical Terminology, Organisation MCA
A UK government agency responsible for implementing maritime safety and environmental policies. It oversees the UK’s search and rescue...
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.
- Abbreviation, General Nautical Terminology, Navigation Mean High Water Neaps (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 Mean High Water Springs (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 - Abbreviation, General Nautical Terminology, Navigation Mean Low Water Neaps (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 Mean Low Water Springs (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 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, Signals & Communication 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, Organisation, Weather (Meteorology) Met Office
The United Kingdom's national meteorological service, responsible for providing weather and climate-related services, including marine...
More Details - General Nautical Terminology, Signals & Communication 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 - 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 Mist
Visibility reduced by fine water droplets suspended in the air.
This is less severe than fog but can still make navigation marks, shore...
More Details - 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

