Glossary
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TermDefinition
- General Nautical Terminology Vang
A line or tackle system used to control the angle of a boom on a sailing vessel, preventing it from lifting and stabilising the sail.
The...
More Details - General Nautical Terminology, Safety Vanishing Angle
The maximum angle of heel at which a vessel can recover to an upright position without capsizing.
The vanishing angle is a critical concept in...
More Details - General Nautical Terminology, Navigation Variation
The angular difference between true north and magnetic north, also known as magnetic declination, which affects compass readings.
Variation is...
More Details - Flag / Pennant, Signals & Communication Code Flag Victor (V)

The International Maritime Signal Flag Victor.
Meaning
I require assistance.
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If appended with a Numeral Pennant, Velocity in kilometres... - General Nautical Terminology VDOP
A measure used in satellite navigation systems, such as GPS, to quantify the impact of satellite geometry on vertical positioning accuracy. It...
More Details - General Nautical Terminology, Navigation Vector Chart
A digital nautical chart that represents navigational data using vector graphics, allowing for scalable and interactive mapping of maritime...
More Details - General Nautical Terminology, Navigation Velocity Made Good (VMG)
The speed at which a vessel is effectively moving towards its intended destination, factoring in both its current speed and the angle of travel...
More Details - General Nautical Terminology Vertical Dilution of Precision (VDOP)
A measure used in satellite navigation systems, such as GPS, to quantify the impact of satellite geometry on vertical positioning accuracy. It...
More Details - General Nautical Terminology, Signals & Communication Very High Frequency (VHF)
A range of radio frequencies from 30 MHz to 300 MHz, commonly used in marine communication for short-range, line-of-sight transmissions.
Very...
More Details - General Nautical Terminology Vessel
Any craft designed for transportation on water, including ships, boats, and other waterborne vehicles.
A vessel is any structure or craft...
More Details - General Nautical Terminology, Navigation, Safety Vessel Traffic Service (VTS)
A shore-based system that monitors and manages vessel movements in busy or hazardous waterways to enhance safety, efficiency, and environmental...
More Details - General Nautical Terminology, Signals & Communication VHF
A range of radio frequencies from 30 MHz to 300 MHz, commonly used in marine communication for short-range, line-of-sight transmissions.
Very...
More Details - General Nautical Terminology, Safety, Signals & Communication VHF Radio
A communication device that operates on Very High Frequency (VHF) radio waves, used for ship-to-ship, ship-to-shore, and emergency maritime...
More Details - Phonetic Alphabet, Signals & Communication Victor
Pronounced: VIK-tah
The term for the letter B in the NATO Phonetic Alphabet.
- General Nautical Terminology Victualling
The process or system of provisioning a ship with necessary supplies, especially food and drink, for the crew's sustenance during a...
More Details - General Nautical Terminology, Weather (Meteorology) Viking
Sea area of the Met Office Shipping Forecast. This area covers the northernmost part of the North Sea, off the east coast of the UK and west...
More Details - General Nautical Terminology, Weather (Meteorology) Violent Storm
Beaufort Scale - Force 11
A violent storm is a weather phenomenon characterised by strong winds exceeding 64 knots (74 miles per hour) and...
More Details - Flag Semaphore, Signals & Communication Letter V (Flag Semaphore)

Flag semaphore indicating the letter V.
- Morse Code, Signals & Communication Letter V (Morse Code)
International Morse Code sequence representing the letter V.
- General Nautical Terminology, Navigation VMG
The speed at which a vessel is effectively moving towards its intended destination, factoring in both its current speed and the angle of travel...
More Details - General Nautical Terminology, Navigation, Safety VTS
A shore-based system that monitors and manages vessel movements in busy or hazardous waterways to enhance safety, efficiency, and environmental...
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