Sailing terms and nautical glossary
Find clear definitions of sailing terms, boat parts, knots, navigation and nautical abbreviations. New to sailing? Start with the everyday words below, then explore the full glossary by subject or search for a term.
Sailing terms for beginners
Begin with port and starboard, bow, windward and leeward. Learn how sheets and halyards control sails, then explore points of sail, tacking and gybing.
For terms in context, read our beginner sailing vocabulary guide. Ready to practise on the water? Our first sailing course guide explains how to choose a starting route.
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TermDefinition
- General Nautical Terminology, Nautical Topics, Safety, Signals & Communication 406 MHz Beacon
A distress beacon that transmits a digitally coded alert on 406 MHz to the Cospas-Sarsat satellite system.
EPIRBs, PLBs and some aviation...
More Details - General Nautical Terminology, Nautical Topics, Navigation, Parts of a Boat Abaft
Farther towards the stern than a stated point or object on a vessel.
It is a relative positional term: equipment abaft the mast lies on the...
More Details - General Nautical Terminology, Nautical Topics, Maritime Language & Traditions Abaft the Beam
Located or bearing behind a vessel's beam.
The expression covers directions between the beam and the stern and is relative to the vessel...
More Details - General Nautical Terminology, Nautical Topics, Sea State & Waves, Weather (Meteorology) Abate
To become less intense or severe, especially when describing wind, sea or weather.
A forecast, log or report may state that a gale, swell or...
More Details - General Nautical Terminology, Nautical Topics, Navigation, Parts of a Boat Abeam
Directly to either side of a vessel, approximately at right angles to its fore-and-aft line.
An object abeam bears about 090 degrees or 270...
More Details - General Nautical Terminology, Nautical Topics, Navigation Abort Point
A predetermined position or condition beyond which a manoeuvre or passage cannot be safely continued as planned.
It provides an explicit...
More Details - General Nautical Terminology, Nautical Topics, Maritime Language & Traditions Above Board
An expression meaning open, honest and free from concealment or deception.
The expression is commonly linked to conduct visible above a...
More Details - General Nautical Terminology, Nautical Topics, Parts of a Boat, Safety Above Deck
The exposed or upper part of a vessel situated on or above its weather deck.
The phrase distinguishes deck-level and superstructure spaces or...
More Details - General Nautical Terminology, Nautical Topics, Parts of a Boat, Points of Sail, Safety Accidental Gybe
An unintended gybe in which the boom and mainsail cross the vessel abruptly as the apparent wind moves across the stern.
It may result from...
More Details - General Nautical Terminology, Nautical Topics, Navigation, Safety, Signals & Communication Code Flag Alpha (A)
An International Code of Signals flag meaning “I have a diver down; keep well clear at slow speed” when flown alone.
Code flag Alpha is...
More Details - General Nautical Terminology, Nautical Topics, Navigation, Safety Adrift
Floating freely without being secured to the shore, seabed or another fixed point.
A vessel, boat or object may be adrift after parting a...
More Details - Courses, General Nautical Terminology, Nautical Topics, RYA, Navigation, Safety Advanced Pilotage
An RYA practical or specialist training activity developing pilotage in confined, tidal, poor-visibility or night conditions.
Work may include...
More Details - Courses, General Nautical Terminology, Nautical Topics, RYA, Points of Sail, Safety Advanced Plus Windsurfing
An RYA high-level windsurfing development course extending advanced technique and personal performance.
Coaching targets the sailor’s selected...
More Details - Courses, General Nautical Terminology, Nautical Topics, RYA, Points of Sail, Safety Advanced Windsurfing
An RYA advanced practical course refining high-wind windsurfing, efficient planing and advanced manoeuvres.
Content may include fast tacks and...
More Details - General Nautical Terminology, Nautical Topics, Parts of a Boat, Points of Sail Aerodynamics
The study of air in motion and the forces it produces on objects.
For sailing, it helps explain how sail shape, angle to the apparent wind and...
More Details - General Nautical Terminology, Nautical Topics, Depths & Clearance, Parts of a Boat, Safety Afloat
Supported by the water and not resting on the bottom or shore.
A vessel is afloat when buoyancy supports its weight and it is free of the...
More Details - General Nautical Terminology, Nautical Topics, Navigation, Parts of a Boat Aft
Towards or in the rear part of a vessel.
Aft may describe direction, as in “move aft”, or location, as in “the aft cabin”. Its opposite is...
More Details - General Nautical Terminology, Nautical Topics, Parts of a Boat After Deck
A deck or part of a deck situated towards the stern of a vessel.
Also commonly called the aft deck, its precise boundaries and use depend on...
More Details - General Nautical Terminology, Nautical Topics, Depths & Clearance, Navigation, Safety Aground
In contact with or resting on the seabed, shore or other ground instead of floating freely.
A vessel may take the ground deliberately or run...
More Details - General Nautical Terminology, Nautical Topics, Navigation, Parts of a Boat Ahead
In front of a vessel or in the direction of its bow.
An object dead ahead lies approximately on the vessel’s fore-and-aft line beyond the bow....
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