Glossary
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TermDefinition
- General Nautical Terminology, Weather (Meteorology) Humber
Sea area of the Met Office Shipping Forecast. Lies off the east coast of England, near the Humber Estuary.
Named for the Humber Estuary...
More Details - General Nautical Terminology, Weather (Meteorology) Hurricane Force
Beaufort Scale - Force 12 (Hurricane Force 12)
Hurricane-force is a term used to describe wind speeds equal to or greater than 64 knots (74...
More Details - General Nautical Terminology Hydrofoil
A lifting surface or structure mounted beneath a vessel's hull that, when moving through water, generates lift to raise the hull above the...
More Details - General Nautical Terminology HydrographyThe science of surveying the waters of the earth and adjacent land area, and publishing the results in charts, pilots, etc, for example Admiralty... More Details
- General Nautical Terminology IALA
The International Association of Lighthouse Authorities (IALA) is an international organisation that aims to promote safe, efficient, and...
More Details - General Nautical Terminology ICC
An official document that certifies a person's ability to operate a pleasure craft in countries that recognise it.
The International...
More Details - Flag / Pennant, Signals & Communication Code Flag India (I)

The International Maritime Signal Flag India.
Meaning
I am altering course to port.
- General Nautical Terminology, Weather (Meteorology) ICON
A numerical weather prediction model that uses a grid system based on an icosahedron to simulate atmospheric processes with high resolution and...
More Details - General Nautical Terminology, Weather (Meteorology) ICOsahedral Nonhydrostatic model (ICON)
A numerical weather prediction model that uses a grid system based on an icosahedron to simulate atmospheric processes with high resolution and...
More Details - Flag / Pennant, General Nautical Terminology, Signals & Communication ICS
A system of flags, codes, and symbols used by ships to communicate essential messages and ensure safety at sea, regardless of language...
More Details - Did you know?, General Nautical Terminology, Navigation IDL
An imaginary longitudinal line located at approximately 180 degrees longitude serving as the demarcation where the calendar date changes by one...
More Details - General Nautical Terminology, Navigation IHO
An intergovernmental organisation dedicated to ensuring the uniformity and standardisation of hydrographic and nautical charting practices...
More Details - Flag Semaphore, Signals & Communication Letter I (Flag Semaphore)

This shape represents the Letter I (Flag Semaphore) and the Number 9 (Flag Semaphore).
- Morse Code, Signals & Communication Letter I (Morse Code)
International Morse Code sequence representing the letter I.
- Organisation IMO
A specialised agency of the United Nations headquartered in London and responsible for regulating shipping, the IMO has 175 Member States.
The...
More Details - General Nautical Terminology Impeller
An impeller is a rotating component within a pump or compressor that is used to impart motion to a fluid. It typically consists of blades or...
More Details - Courses, RYA Improve your WingsurfingThe RYA Improve Your Wingsurfing course is aimed at wingsurfers who want to refine their skills and gain more control. Participants learn advanced... More Details
- Phonetic Alphabet, Signals & Communication India
Pronounced: IN-dee-ah
The term for the letter I in the NATO Phonetic Alphabet.
- General Nautical Terminology In Hauler
A line or tackle used to pull a sail or spar inboard, typically to adjust sail shape or reduce projection beyond the hull.
An in hauler is a...
More Details - General Nautical Terminology In Irons
A situation where a sailing vessel is stalled with its bow pointed directly into the wind, making it difficult to manoeuvre or gain forward...
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