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Favourable or clear when describing weather, and smooth or continuously shaped when describing a vessel’s surface or line. A fair wind assists the intended passage or sailing direction, while fair weather generally means settled or suitable conditions in the stated context. Neither expression defines a wind force, visibility or sea-state threshold. In boatbuilding, to fair…
A fitting that guides a rope, wire or cable along a required lead or through a change of direction. Fairleads include smooth eyes, horns, rollers and specialised deck or bulwark fittings used for mooring lines, sheets, control cables and other running systems. Their shape, strength and alignment must suit the line material, diameter, load and…
A navigable channel or recognised route through a harbour, river or other confined waterway. A fairway is normally the part of the waterway intended for through navigation and may be defined by its depth, lateral marks, charted limits or local directions. It is not necessarily the deepest water everywhere, and its available width and depth…
A safe water mark used to identify a channel centreline, approach or landfall. Under the IALA buoyage system, the mark has red-and-white vertical stripes and may carry a single red spherical topmark. Its permitted white-light characteristics identify it as safe water rather than a lateral or isolated-danger mark. A fairway mark is often placed at…
A resilient buffer placed between a vessel and a berth or another vessel to reduce contact damage. Portable fenders may be inflatable, foam-filled, cylindrical, spherical or flat and are suspended at the expected contact points and heights. Fixed berth fender systems serve the same broad purpose on quays and pontoons but are engineered for their…
The uninterrupted distance of open water over which wind blows in a broadly constant direction. Fetch is measured along the upwind water surface available for wave generation, not as the path travelled by an individual parcel of air. Coastlines, islands, ice and major changes in wind direction can limit the effective fetch. Wave growth depends…
A tapered tool used to open rope strands and assist with splicing and ropework. A traditional fid is commonly wood or metal and is pushed between the strands of laid rope without cutting or damaging them. It creates space for another strand to be tucked during an eye splice, short splice or similar work. Modern…
A determined vessel position obtained from observations or reliable position data. A traditional fix is plotted from two or more position lines observed at the same time or corrected to a common time. Electronic navigation systems can provide a direct position fix from GNSS or another suitable positioning source. Every fix has uncertainty arising from…
Pyrotechnic signals used to indicate distress, attract attention or help rescuers locate people or a vessel. Rocket parachute flares provide a high, long-range red light; red hand flares provide a shorter-range locating signal; and orange smoke signals aid daytime location. The correct signal depends on whether distant alerting or close-range location is required and on…
A rhythmic navigation light whose periods of light are shorter in total than its periods of darkness.
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