Glossary
-
TermDefinition
- General Nautical Terminology, Organisation IALA
A non-governmental organisation that develops standards and best practices for the safety and efficiency of maritime navigation through the use...
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...
More Details - Courses, RYA Inland Waterways CrewThe RYA Inland Waterways Crew course provides essential training for assisting with operations on canals, rivers, and other inland waterways.... More Details
- Courses, RYA Inland Waterways Helmsman'sThe RYA Inland Waterways Helmsman’s course is designed for those operating boats on canals and rivers. This two-day course covers boat handling,... More Details
- General Nautical Terminology, Organisation, Safety INMARSAT
A global satellite communications organisation providing maritime, aviation, and land-based services for safety and operational...
More Details - General Nautical Terminology Inshore
The area of water close to the shore, typically within a few miles, where vessels operate in relatively calmer and shallower waters compared to...
More Details

