Glossary
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TermDefinition
- Flag / Pennant, Signals & Communication Code Flag Uniform (U)

The International Maritime Signal Flag Uniform.
Meaning
You are running into danger.
- Organisation UKHO
The UK government agency responsible for producing nautical charts, publications, and navigational information to support safe maritime...
More Details - Organisation UK Hydrographic Office (UKHO)
The UK government agency responsible for producing nautical charts, publications, and navigational information to support safe maritime...
More Details - General Nautical Terminology, Weather (Meteorology) UKMO
The global numerical weather prediction model developed by the United Kingdom Met Office, providing forecasts for various weather parameters...
More Details - General Nautical Terminology, Weather (Meteorology) UKMO Global (UKMO)
The global numerical weather prediction model developed by the United Kingdom Met Office, providing forecasts for various weather parameters...
More Details - General Nautical Terminology, Weather (Meteorology) UKV
A high-resolution numerical weather prediction model used by the UK Met Office to provide detailed weather forecasts for the United Kingdom and...
More Details - Flag Semaphore, Signals & Communication Letter U (Flag Semaphore)

Flag semaphore indicating the letter U.
- Morse Code, Signals & Communication Letter U (Morse Code)
International Morse Code sequence representing the letter U.
- General Nautical Terminology Ultraviolet (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 - Organisation UN
An international organisation founded in 1945 aimed at promoting peace, security, and cooperation among countries worldwide.
The United...
More Details - General Nautical Terminology Underhand loop
A loop which crosses under the standing part of a rope when tying a knot.
- Did you know?, Nautical Saying Under the Weather
Under the weather is commonly used to describe feeling ill or unwell. Its origins can be traced back to maritime language. It originated from the...
More Details - General Nautical Terminology Underway
Underway refers to vessels not anchored or made fast to the shore (for example, a marina or mooring buoy). The vessel may be moving due to the...
More Details - Phonetic Alphabet, Signals & Communication Uniform
Pronounced: YOU-nee-form
The term for the letter U in the NATO Phonetic Alphabet.
- General Nautical Terminology, Weather (Meteorology) United Kingdom Variable-resolution model (UKV)
A high-resolution numerical weather prediction model used by the UK Met Office to provide detailed weather forecasts for the United Kingdom and...
More Details - 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...
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