Glossary
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TermDefinition
- Courses, RYA Level 2 Powerboat Handling (PB2)The RYA Level 2 Powerboat Handling course is a comprehensive two-day program that teaches participants the skills needed to operate powerboats... More Details
- General Nautical Terminology, Safety Life Jacket
A buoyant, wearable safety device designed to keep a person afloat in the water and reduce the risk of drowning.
A life jacket, also known as...
More Details - General Nautical Terminology LifelinePersonal safety device attached to harness on lifejacket and to vessel strongpoint. Designed to keep you on board
- General Nautical Terminology, Safety Liferaft
An inflatable or rigid floating device designed to provide emergency refuge and safety for individuals forced to abandon a vessel at sea.
A...
More Details - General Nautical Terminology Lighthouse
A tall, often cylindrical structure equipped with a powerful light and other navigational aids, built near coastlines or on islands to guide...
More Details - Phonetic Alphabet, Signals & Communication Lima
Pronounced: LEE-mah
The term for the letter L in the NATO Phonetic Alphabet.
- General Nautical Terminology Line
A rope used on a boat for various purposes, such as securing the vessel to a mooring (mooring line), adjusting sails (halyard or sheet), towing...
More Details - General Nautical Terminology, Navigation Lines of Position (LOP)
Navigational lines drawn on a chart, each representing a possible location of a vessel based on a single observation or measurement.
A line...
More Details - General Nautical Terminology ListA permanent lean to one side or the other
- General Nautical Terminology Listing
The condition of a vessel leaning to one side due to an imbalance in weight or external forces.
A vessel lists when it tilts to port or...
More Details - Flag Semaphore, Signals & Communication Letter L (Flag Semaphore)

Flag semaphore indicating the letter L.
- Morse Code, Signals & Communication Letter L (Morse Code)
International Morse Code sequence representing the letter L.
- General Nautical Terminology LNM
A Local Notice to Mariners (LNM) is a publication issued by maritime authorities to provide important information to mariners about navigational...
More Details - General Nautical Terminology Local Notice to Mariners (LNM)
A Local Notice to Mariners (LNM) is a publication issued by maritime authorities to provide important information to mariners about navigational...
More Details - General Nautical Terminology Lock
A gated section of a waterway, such as a canal or river, designed to raise or lower vessels between stretches of water at different levels.
A...
More Details - General Nautical Terminology, Parts of a Boat Locker
A storage compartment or enclosed space on a boat, typically used for stowing equipment, gear, or provisions securely.
A locker on a boat is a...
More Details - General Nautical Terminology Logbook
An official record maintained aboard a vessel that documents the ship's daily activities, including navigational data, weather conditions, and...
More Details - General Nautical Terminology Log Line
A device used historically by mariners to measure a vessel's speed through the water.
The log line consists of a wooden board, known as the...
More Details - General Nautical Terminology Log ReadingThe reading of distance travelled through the water usually taken every hour from the log and recorded in the deck log
- General Nautical Terminology, Navigation Longitude
The geographic coordinate that specifies the east-west position of a point on the Earth's surface, measured in degrees(°), minutes(') and...
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