Glossary
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TermDefinition
- General Nautical Terminology, Navigation TSS
A navigation system designed to organise the flow of vessel traffic in congested or high-risk areas, ensuring safe passage by separating opposing...
More Details - General Nautical Terminology, Navigation TTGEstimated time remaining to a waypoint giving an indication of arrival time
- General Nautical Terminology Turn
When a rope passes around an object, such as a post, when tying a knot.
- General Nautical Terminology, Weather (Meteorology) Tyne
Sea area of the Met Office Shipping Forecast. Covers the southwestern North Sea, off the River Tyne estuary in northeast England.
From the River...
More Details - General Nautical Terminology, Navigation TZ
A region of the Earth where the same standard time is used.
A time zone is a geographical area that observes a uniform standard time for...
More Details - 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
A vessel that is not at anchor, made fast to the shore, or aground, and is actively moving through the water.
In maritime terminology,...
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...
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