Glossary
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TermDefinition
- General Nautical Terminology, Weather (Meteorology) German Bight
Sea area of the Met Office Shipping Forecast. Located in the southeastern North Sea, off the coast of northern Germany and the...
More Details - General Nautical Terminology, Weather (Meteorology) 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 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 Vessel
The vessel required to keep clear of another under the collision regulations.
This vessel should take early and clear action so the other...
More Details - 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 About
Changing tack by turning the bow through the wind.
This manoeuvre brings the wind from one side of the vessel to the other, allowing progress...
More Details - General Nautical Terminology Going Astern
Moving backwards through the water under engine or controlled momentum.
This is usually done when leaving a berth, stopping a vessel, or...
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