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, Parts of a Boat, Points of Sail Laminar Flow
Fluid motion in which adjacent layers move with little irregular mixing between them.
It can occur in parts of the boundary layer around a...
More Details - General Nautical Terminology, Nautical Topics, Parts of a Boat Laminate
A material made by bonding two or more layers to combine their properties.
Marine laminates include fibre-reinforced hull structures and...
More Details - General Nautical Terminology, Nautical Topics, Navigation, Weather (Meteorology) Land Breeze
A local offshore wind produced when land cools more quickly than adjacent water, usually at night or near dawn.
Cooler, denser air over land...
More Details - General Nautical Terminology, Nautical Topics, Navigation, Safety Landfall
The first sighting or close approach to land after an open-water passage.
The term can describe the event, the intended area of coast or the...
More Details - General Nautical Terminology, Nautical Topics, Parts of a Boat, Safety Lanyard
A short line, cord or strap used to secure, operate or retain an item aboard a vessel.
Lanyards prevent portable equipment such as knives,...
More Details - Abbreviation, General Nautical Terminology, Nautical Topics, Navigation, Signals & Communication Large Automatic Navigational Buoy (LANBY)
Abbreviated LANBY.
It is a large unmanned buoy carrying navigational aids and may also support meteorological or oceanographic equipment.
- General Nautical Terminology, Nautical Topics, Parts of a Boat, Safety Lash Down
To secure an item with lashings so that it cannot shift beyond acceptable limits.
Lashings may use rope, webbing, chain, wire or purpose-made...
More Details - Abbreviation, General Nautical Terminology, Nautical Topics, Depths & Clearance, Navigation, Tides LAT
The lowest tidal level predicted to occur under average meteorological conditions from any combination of astronomical influences.
LAT is...
More Details - General Nautical Terminology, Nautical Topics, Navigation, Signals & Communication Lateral Mark
A navigation mark that indicates the side of a channel or recognised route.
Lateral marks use colour, shape, topmarks and light...
More Details - General Nautical Terminology, Nautical Topics, Navigation Latitude
Angular distance north or south of the Equator, expressed from 0 degrees to 90 degrees.
Latitude identifies a parallel on a chosen geodetic...
More Details - General Nautical Terminology, Nautical Topics, Navigation Latitude Scale
The graduated latitude markings along the sides of a nautical chart.
On a Mercator chart, one minute of latitude represents one nautical mile...
More Details - General Nautical Terminology, Nautical Topics, Parts of a Boat, Safety Lazarette
A storage or service compartment in the after part of a vessel.
A lazarette is commonly beneath the cockpit or aft deck and may contain...
More Details - General Nautical Terminology, Nautical Topics, Parts of a Boat Lazarette Hatch
An opening and cover giving access to a storage compartment near a vessel’s stern.
It may be in the cockpit or after deck and can admit water...
More Details - General Nautical Terminology, Nautical Topics, Parts of a Boat, Points of Sail, Safety Lazyjacks
Lines rigged on each side of a boom to guide and contain a sail as it is lowered.
They normally lead from the mast or upper rigging to points...
More Details - General Nautical Terminology, Nautical Topics, Safety, Signals & Communication Code Flag Lima (L)
An International Code of Signals flag whose single-letter meaning is “You should stop your vessel instantly.”.
The Lima flag may be displayed...
More Details - Abbreviation, General Nautical Terminology, Light Characteristic, Nautical Topics, Depths & Clearance, Navigation, Safety, Signals & Communication Ldg Lts
A pair or series of separated lights that define a navigational leading line when seen in vertical alignment.
The rear light is normally...
More Details - Abbreviation, General Nautical Terminology, Light Characteristic, Nautical Topics, Depths & Clearance, Navigation, Safety, Signals & Communication Leading Lights (Ldg Lts)
A pair or series of separated lights that define a navigational leading line when seen in vertical alignment.
The rear light is normally...
More Details - General Nautical Terminology, Nautical Topics, Navigation Leading Line
A charted or observed line formed by two aligned marks that indicates a safe or defined track.
When the rear mark appears vertically above the...
More Details - General Nautical Terminology, Nautical Topics, Depths & Clearance, Navigation, Parts of a Boat, Safety Lead Line
A marked line with a weighted lead used to measure water depth and, in some forms, obtain a seabed sample.
The line carries distance marks...
More Details - General Nautical Terminology, Nautical Topics, Navigation League
A historical measure of distance whose value varied, commonly taken at sea as three nautical miles.
The league was traditionally associated...
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