Glossary Archive

Medium Frequency

The range of radio frequencies between 300 kHz and 3 MHz, commonly used in marine communication and navigation systems. Medium Frequency (MF) is a segment of the radio spectrum that plays a pivotal role in maritime operations. Falling between 300 kHz and 3 MHz, this range is particularly significant for its ability to propagate over...


Met Office

The United Kingdom's national meteorological service, responsible for providing weather and climate-related services, including marine forecasts. The Met Office, short for the Meteorological Office, is the UK's official authority for weather and climate science. It plays a vital role in marine operations by issuing forecasts, warnings, and real-time data for coastal and offshore waters. Mariners...


MF

The range of radio frequencies between 300 kHz and 3 MHz, commonly used in marine communication and navigation systems. Medium Frequency (MF) is a segment of the radio spectrum that plays a pivotal role in maritime operations. Falling between 300 kHz and 3 MHz, this range is particularly significant for its ability to propagate over...


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 occur when the difference between high and low tide heights is the least, which happens during the first and third quarters of the moon when the sun and moon...


MHWS

A tidal datum representing the average height of the high water level during spring tides over a specific period, typically measured over a 19-year Metonic cycle. Spring tides occur when the sun, moon, and Earth are aligned, resulting in higher and lower tides. MHWS is an important reference point in maritime navigation, coastal engineering, and...


Mike

Pronounced: MIKE The term for the letter M in the NATO Phonetic Alphabet.


Mist

Visibility reduced to between 0.5 and 2 nautical miles due to suspension of water particles in the air


Mistral

A strong, cold, and dry northwesterly katabatic wind that blows from southern France into the Mediterranean, particularly affecting the Gulf of Lion. The Mistral is a prominent meteorological phenomenon in the northwestern Mediterranean, especially along the southern coast of France. It originates from high-pressure systems over the Atlantic or northern Europe and low-pressure systems over...