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, Navigation S-57
The IHO standard historically used to transfer digital hydrographic data, including Electronic Navigational Charts.
It defines the object...
More Details - General Nautical Terminology, Nautical Topics, Depths & Clearance, Navigation, Organisation S-100 Universal Hydrographic Data Model
The IHO framework for creating interoperable digital maritime data-product specifications.
S-100 is based on the ISO 19100 family of...
More Details - General Nautical Terminology, Nautical Topics, Navigation S-101
The IHO product specification for Electronic Navigational Chart data within the S-100 framework.
It provides a newer data model and portrayal...
More Details - General Nautical Terminology, Nautical Topics, Parts of a Boat, Safety Sacrificial Anode
A deliberately reactive metal component that corrodes in preference to protected underwater metalwork.
The anode is electrically connected to...
More Details - Courses, General Nautical Terminology, Nautical Topics, RYA, Navigation, Safety Safe and Fun Safeguarding
An RYA online safeguarding course for people working or volunteering with children and vulnerable people in boating.
It introduces good...
More Details - General Nautical Terminology, Nautical Topics, Navigation, Safety Safe Speed
A speed at which a vessel can take proper and effective action to avoid collision and be stopped within an appropriate distance.
The collision...
More Details - Courses, General Nautical Terminology, Nautical Topics, RYA, Navigation, Safety Safety Boat
An RYA practical course for crews providing safety and rescue cover to sailing, windsurfing and other water-based activities.
It develops...
More Details - General Nautical Terminology, Nautical Topics, Safety Safety Knife
A readily accessible cutting tool intended to release rope, webbing or other material in an emergency.
A guarded or rounded-tip design may...
More Details - General Nautical Terminology, Nautical Topics, Safety Safety Tether
A load-rated tether connecting a crew member's harness to a strong point or jackline on a vessel.
It is intended to prevent separation from...
More Details - General Nautical Terminology, Nautical Topics, Navigation, Signals & Communication Safe Water Mark
A navigation mark indicating navigable water around the mark.
Under the IALA Maritime Buoyage System, a safe water mark has red-and-white...
More Details - General Nautical Terminology, Nautical Topics, Safety, Sea State & Waves, Weather (Meteorology) Saffir–Simpson Hurricane Wind Scale (SSHWS)
A five-category scale classifying hurricanes by their maximum sustained surface wind speed.
Category 1 begins at 64 knots and Category 5 at...
More Details - General Nautical Terminology, Nautical Topics, Parts of a Boat, Points of Sail Sail Balance
The distribution of aerodynamic force between a vessel's sails and its relationship to the hull and underwater foils.
Good balance produces...
More Details - General Nautical Terminology, Nautical Topics, Parts of a Boat, Safety Saildrive
An inboard-engine drive unit whose geared leg passes through the hull and carries the propeller.
The engine is mounted inside the vessel and...
More Details - General Nautical Terminology, Nautical Topics, Parts of a Boat, Safety Saildrive
A geared propulsion leg that carries power from an inboard engine vertically through the hull to an underwater propeller.
The engine is...
More Details - General Nautical Terminology, Nautical Topics, Parts of a Boat Saildrive Diaphragm
A flexible sealing membrane fitted around a saildrive leg where it passes through the hull.
The structural installation normally includes an...
More Details - General Nautical Terminology, Nautical Topics, Navigation, Organisation, Safety Sailing Directions
Official or authoritative publications giving descriptive navigation information that supplements nautical charts.
They can describe coast and...
More Details - General Nautical Terminology, Nautical Topics, Points of Sail Sailing Instructions
The event-specific rules and directions issued for a sailing race or regatta.
They define matters such as course, signals, schedule, starting...
More Details - General Nautical Terminology, Nautical Topics, Navigation, Safety Sailing-vessel Rule
A collision-regulation provision governing the conduct of sailing vessels in relation to one another or other vessels.
Which vessel keeps...
More Details - General Nautical Terminology, Nautical Topics, Parts of a Boat, Points of Sail, Safety Sail Locker
A compartment intended for stowing sails and associated sail-handling equipment.
It may be a dedicated forepeak or deck locker or a dry...
More Details - General Nautical Terminology, Nautical Topics, Parts of a Boat Sail Slide
A fitting attached to a sail that runs in a track on a mast, boom or stay.
Sail slides hold the sail’s luff or foot close to its supporting...
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