Glossary
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TermDefinition
- Courses, RYA Intermediate Windsurfing (Planing)The RYA Intermediate Windsurfing (Planing) course introduces participants to planing techniques, enabling them to harness the power of stronger... More Details
- General Nautical Terminology International Association of Lighthouse Authorities (IALA)
The International Association of Lighthouse Authorities (IALA) is an international organisation that aims to promote safe, efficient, and...
More Details - General Nautical Terminology International Certificate of Competence (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, General Nautical Terminology, Signals & Communication International Code of Signals (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 - General Nautical Terminology International Convention for the Prevention of Pollution from Ships (MARPOL)
Established by the IMO, MARPOL is the convention for preventing pollution from ships. It is the main international convention covering the...
More Details - Did you know?, General Nautical Terminology, Navigation International Date Line (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 International Hydrographic Organization (IHO)
An intergovernmental organisation dedicated to ensuring the uniformity and standardisation of hydrographic and nautical charting practices...
More Details - Organisation International Maritime 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 - Flag / Pennant, Signals & Communication International Maritime Signal Flags
A system of flags ships use to communicate messages, signals, or important information visually. Flags often represent letters, numbers, or...
More Details - Did you know?, Navigation International Meridian Conference
A diplomatic meeting held in 1884 in Washington, D.C., where representatives from 25 nations convened to establish a standard prime meridian for...
More Details - Morse Code, Signals & Communication International Morse Code
A standardised system of encoding text characters as sequences of dots (short signals) and dashes (long signals) used for communication,...
More Details - General Nautical Terminology International Regulations for Preventing Collisions at Sea (IRPCS)
Published by the International Maritime Organisation (IMO), they set out, among other things, the "rules of the road" or navigation rules to be...
More Details - Organisation, Signals & Communication International Telecommunication Union (ITU)
A specialised agency of the United Nations responsible for coordinating global telecommunication operations and services, including radio...
More Details - General Nautical Terminology IRPCS
Published by the International Maritime Organisation (IMO), they set out, among other things, the "rules of the road" or navigation rules to be...
More Details - Organisation ISAF
World Sailing, formerly known as the International Sailing Federation (ISAF), is the governing body for the sport of sailing...
More Details - Light Characteristic Iso
A light where the duration of light and darkness are equal.
Isophase describes a navigational aid that emits a light signal with equal periods...
More Details - General Nautical Terminology IsobarOn a synoptic chart, a line joining points of equal pressure
- General Nautical Terminology Isolated Danger Mark
Buoy or pillar positioned on a dangerous underwater obstruction.
An isolated danger mark is a navigation aid used at sea to indicate a...
More Details - Light Characteristic Isophase (Iso)
A light where the duration of light and darkness are equal.
Isophase describes a navigational aid that emits a light signal with equal periods...
More Details - Organisation, Signals & Communication ITU
A specialised agency of the United Nations responsible for coordinating global telecommunication operations and services, including radio...
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