Glossary
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TermDefinition
- General Nautical Terminology Gimbal
A pivoted support that allows an object, such as a compass or a stove, to remain level regardless of the motion of the vessel.
A gimbal is a...
More Details - General Nautical Terminology Give Way
In a collision situation, one or more vessels are defined as Give Way. The Give Way vessel should alter its course to concede passage to another...
More Details - General Nautical Terminology Give Way VesselThe vessel whose duty it is to keep clear of another, she should take early and substantial action to avoid a collision
- Organisation GLA
A term that collectively refers to the three organisations responsible for maintaining maritime navigation aids—such as lighthouses, buoys, and...
More Details - General Nautical Terminology Glass Reinforced Plastic (GRP)
A composite material made of a polymer matrix reinforced with fine glass fibres, commonly used in marine applications for its strength,...
More Details - Flag Semaphore, Signals & Communication Letter G (Flag Semaphore)

This shape represents the Letter G (Flag Semaphore) and the Number 7 (Flag Semaphore).
- Morse Code, Signals & Communication Letter G (Morse Code)
International Morse Code sequence representing the letter G.
- General Nautical Terminology, Weather (Meteorology) Global Forecast System (GFS)
A weather model developed by the National Centers for Environmental Prediction (NCEP) that provides global weather forecasts by simulating the...
More Details - General Nautical Terminology, Safety Global Maritime Distress and Safety System (GMDSS)
An internationally agreed-upon set of safety procedures, communication protocols, and equipment designed to ensure that ships at sea can send and...
More Details - Signals & Communication Global Maritime Distress and Safety System Sea Areas
A map of the UK indicating the 3 sea areas around the coast and the coast of nearby European countries. White pointers indicate Medium Frequency...
More Details - General Nautical Terminology, Navigation Global Navigation Satellite System (GNSS)
The collective set of systems that enables positioning devices to calculate latitude & longitude. The system includes solutions including the GPS...
More Details - General Nautical Terminology Global Positioning System (GPS)
The US-based system of satellites, able to determine the latitude and longitude of a receiver on Earth by calculating the time difference for...
More Details - General Nautical Terminology, Safety GMDSS
An internationally agreed-upon set of safety procedures, communication protocols, and equipment designed to ensure that ships at sea can send and...
More Details - General Nautical Terminology, Navigation GMT
The mean solar time at the Prime Meridian in Greenwich, London, used as a global time standard.
Greenwich Mean Time (GMT) is a timekeeping...
More Details - General Nautical Terminology, Navigation Gnomonic Projection
A type of map projection where the surface of the Earth is projected onto a plane from the centre of the globe, causing great circles to appear...
More Details - General Nautical Terminology, Navigation GNSS
The collective set of systems that enables positioning devices to calculate latitude & longitude. The system includes solutions including the GPS...
More Details - General Nautical Terminology Go AboutTo change tack by altering course to bring the wind on the other side
- General Nautical Terminology Going AsternWhen going backwards through the water you may hear the skipper say: "I am going astern".
- Phonetic Alphabet, Signals & Communication Golf
Pronounced: GOLF
The term for the letter G in the NATO Phonetic Alphabet.
- General Nautical Terminology Gooseneck
A pivotal fitting on a sailing vessel that connects the boom to the mast, allowing for controlled movement in multiple directions.
The...
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