Glossary
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TermDefinition
- Organisation United Nations (UN)
An international organisation founded in 1945 aimed at promoting peace, security, and cooperation among countries worldwide.
The United...
More Details - Organisation United States Naval Observatory (USNO)
A scientific institution operated by the United States Navy that specialises in astronomical and timekeeping research, providing precise...
More Details - Organisation USCG
A United States Armed Forces branch, responsible for maritime safety, security, and environmental stewardship in domestic and international...
More Details - Organisation U.S. Coast Guard (USCG)
A United States Armed Forces branch, responsible for maritime safety, security, and environmental stewardship in domestic and international...
More Details - Organisation USNO
A scientific institution operated by the United States Navy that specialises in astronomical and timekeeping research, providing precise...
More Details - General Nautical Terminology, Navigation UTC
The primary time standard by which the world regulates clocks and time serving as the basis for civil time globally.
Coordinated Universal...
More Details - General Nautical Terminology UV
Ultraviolet (UV) light is a type of electromagnetic radiation with a wavelength shorter than visible light but longer than X-rays. In the marine...
More Details - General Nautical Terminology, Parts of a Boat 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...
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