Glossary Archive

International Morse Code sequence representing the letter L.

A Local Notice to Mariners (LNM) is a publication issued by maritime authorities to provide important information to mariners about navigational hazards, changes to aids to navigation, and other relevant updates affecting a specific area or waterway. LNMs are typically issued regularly and are essential for ensuring the safety of maritime navigation in a particular...

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A Local Notice to Mariners (LNM) is a publication issued by maritime authorities to provide important information to mariners about navigational hazards, changes to aids to navigation, and other relevant updates affecting a specific area or waterway. LNMs are typically issued regularly and are essential for ensuring the safety of maritime navigation in a particular...

A chamber with gates at each end in which the water level can be raised or lowered

An enclosed stowage anywhere on board

A log is a detailed record kept by a vessel's crew that documents the ship's course, speed, weather conditions, and other important navigational and operational data during a voyage. A log, often referred to as a ship's log or logbook, serves as an official record of a vessel's journey and is essential for both navigational...

A book to keep a record of events, distance run and courses, etc.

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 log, attached to a long, knotted rope. The log was thrown overboard and allowed to float behind the ship while the rope was paid out. Mariners would measure the vessel's...

The reading of distance travelled through the water usually taken every hour from the log and recorded in the deck log