Glossary
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TermDefinition
- Did you know?, Flag Semaphore, Signals & Communication Flag Semaphore Signals
A system for conveying information at a distance through visual signals using hand-held flags.
The position of the flags encodes the...
More Details - General Nautical Terminology Flake
To lay out or coil a line or rope in a flat, organised manner to prevent tangling or kinking.
Flaking is a crucial technique in maritime...
More Details - General Nautical Terminology Flaking a Line
The process of neatly laying out a rope or line in a series of back-and-forth folds to prevent tangling and ensure it runs out smoothly when...
More Details - General Nautical Terminology Flaking a Sail
Flaking a sail is neatly folding or arranging it in parallel or accordion-like folds. This is typically done to store or stow the sail properly...
More Details - General Nautical Terminology Flares
A pyrotechnic device used on boats to signal distress or indicate position, especially in emergencies.
Flares are an essential part of marine...
More Details - General Nautical Terminology Flashing LightA light where there is more darkness than light
- Flag Semaphore, Signals & Communication Letter F (Flag Semaphore)

This shape represents the Letter F (Flag Semaphore) and the Number 6 (Flag Semaphore).
- Morse Code, Signals & Communication Letter F (Morse Code)
International Morse Code sequence representing the letter F.
- General Nautical Terminology, Navigation Flood Tide
The incoming or rising phase of the tide, during which seawater flows landward and the water level increases.
A flood tide is the period...
More Details - General Nautical Terminology, Parts of a Boat Fluke
The flat, triangular blade or arm of an anchor designed to dig into the seabed and provide holding power.
The term "fluke" in a marine context...
More Details - General Nautical Terminology Flying Out
The rapid and uncontrolled movement of a sail or line due to a sudden change in wind or tension.
Flying out typically describes an event where...
More Details - General Nautical Terminology, Signals & Communication FM
A method of encoding information in a carrier wave by varying its frequency, commonly used in marine radio communications.
Frequency...
More Details - General Nautical Terminology Fo'c'sleThe part of the accommodation below the foredeck and forward of the mast
- General Nautical Terminology FogVisibility reduced to less than 1000 metres (approximately 0.5 nautical miles)
- General Nautical Terminology FoghornFog horns are used for sounding the appropriate sound signal whilst in restricted visibility
- General Nautical Terminology Folding PropellerA propeller with folding blades, furling to reduce drag on a sailing vessel when not in use
- General Nautical Terminology Following SeaSeas that are moving in the same direction as the vessel is heading
- General Nautical Terminology Foot
The lower edge of a sail, typically attached to the boom or deck of a sailing vessel.
The term foot refers to the bottom edge of a sail. On a...
More Details - General Nautical Terminology, Parts of a Boat Foredeck
The forward part of a vessel's deck, located towards the bow and often used for anchoring, mooring, or storage.
The foredeck is a critical...
More Details - General Nautical Terminology Forehatch
A hatch located on the forward part of a vessel, typically providing access to the forepeak or forward compartments below deck.
A forehatch is...
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