Glossary
-
TermDefinition
- General Nautical Terminology House flagAny personal flag or club flag flown from starboard spreaders or flagstaff.
- General Nautical Terminology Hull
The watertight body or shell of a boat or ship, excluding the deck, rigging, and other superstructures.
The hull is the fundamental structure...
More Details - General Nautical Terminology Hull SpeedThe maximum efficient speed of a displacement-hulled vessel.
- 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 Hydrography
The surveying and description of seas, coasts, seabeds and navigable waters.
This work provides the measurements and information used to...
More Details - 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

