Glossary
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TermDefinition
- General Nautical Terminology, Nautical Topics, Safety, Signals & Communication Code Flag Uniform (U)
An International Code of Signals flag whose single-letter meaning is “You are running into danger.”.
The Uniform flag may be displayed alone...
More Details - General Nautical Terminology, Nautical Topics, Depths & Clearance, Navigation, Organisation UKHO
The UK government organisation responsible for hydrographic data and ADMIRALTY maritime navigation products.
UKHO compiles and supplies...
More Details - General Nautical Terminology, Nautical Topics, Depths & Clearance, Navigation, Organisation UK Hydrographic Office (UKHO) (UKHO)
The UK government organisation responsible for hydrographic data and ADMIRALTY maritime navigation products.
UKHO compiles and supplies...
More Details - General Nautical Terminology, Nautical Topics, Organisation, Weather (Meteorology) UKMO
The global numerical weather prediction configuration used by the UK Met Office for large-scale forecasts and boundary data.
It is based on...
More Details - General Nautical Terminology, Nautical Topics, Navigation, Safety, Signals & Communication, Weather (Meteorology) UK Shipping Forecast
The Met Office marine forecast for the named sea areas around the British Isles.
It contains gale warnings in force, a general synopsis and...
More Details - General Nautical Terminology, Nautical Topics, Organisation, Weather (Meteorology) UKV
The Met Office’s high-resolution limited-area numerical weather prediction configuration centred on the United Kingdom and Ireland.
UKV uses a...
More Details - General Nautical Terminology, Nautical Topics, Organisation, Weather (Meteorology) UK Variable-resolution Model (UKV) (UKV)
The Met Office’s high-resolution limited-area numerical weather prediction configuration centred on the United Kingdom and Ireland.
UKV uses a...
More Details - General Nautical Terminology, Nautical Topics, Signals & Communication Letter U (Flag Semaphore)
A two-flag semaphore position representing the letter U.
The signaller holds one flag in each hand at the prescribed angles illustrated in the...
More Details - General Nautical Terminology, Nautical Topics, Signals & Communication Letter U (Morse Code)
The International Morse Code letter U, represented by dot dot dash (..-).
A dot lasts one signal unit and a dash three. Elements within this...
More Details - Abbreviation, General Nautical Terminology, Light Characteristic, Nautical Topics, Navigation, Signals & Communication Ultra Quick-flashing Light (UQ)
Repeats at about 200 or 240 flashes per minute.
It is abbreviated UQ and may be continuous or interrupted.
- General Nautical Terminology, Nautical Topics, Parts of a Boat, Safety, Weather (Meteorology) Ultraviolet Radiation (UV) (UV)
Electromagnetic radiation with wavelengths shorter than visible light and longer than X-rays.
Solar ultraviolet radiation is commonly divided...
More Details - General Nautical Terminology, Nautical Topics, Organisation UN
An international organisation founded in 1945 through which member states cooperate on peace, security, development, human rights and...
More Details - Abbreviation, General Nautical Terminology, Nautical Topics, Depths & Clearance, Navigation Uncovers (uncov)
A charted feature is submerged at some states of tide but becomes exposed as the water falls.
It may be abbreviated uncov.
- General Nautical Terminology, Knot, Nautical Topics Underhand Loop
A loop formed so that its working part crosses beneath the standing part.
The crossing direction distinguishes it from an overhand loop, in...
More Details - General Nautical Terminology, Nautical Topics, Depths & Clearance Under-keel Clearance
The vertical distance between a vessel's lowest point and the seabed or other underwater obstruction.
A safe allowance must consider chart...
More Details - General Nautical Terminology, Nautical Topics, Maritime Language & Traditions Under the Weather
An expression meaning to feel ill, unwell or below one's usual condition.
The phrase is frequently claimed to have a nautical origin,...
More Details - General Nautical Terminology, Nautical Topics, Navigation, Safety, Signals & Communication Under Way
The status of a vessel that is not at anchor, made fast to the shore or aground.
Under way is a defined collision-regulation status and does...
More Details - General Nautical Terminology, Nautical Topics, Signals & Communication Uniform (Phonetic Alphabet)
The international radiotelephony spelling word for the letter U.
It is used to spell call signs, identifiers and words clearly over voice...
More Details - Abbreviation, General Nautical Terminology, Light Characteristic, Nautical Topics, Navigation, Signals & Communication Unintensified Light Sector (Unintens)
An arc in which the light has less intensity than its intensified sector.
It may be labelled Unintens.
- General Nautical Terminology, Nautical Topics, Organisation United Nations (UN)
An international organisation founded in 1945 through which member states cooperate on peace, security, development, human rights and...
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