Glossary Archive

Navigational lines drawn on a chart, each representing a possible location of a vessel based on a single observation or measurement.  A line of position (LOP) is a fundamental concept in marine navigation used to determine a vessel's location. It is a line on a nautical chart along which a ship is known to be...

A permanent lean to one side or the other

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 starboard due to an uneven distribution of weight, such as cargo, fuel, or ballast, or as a result of flooding. Unlike rolling, which is a temporary motion caused...

Flag semaphore indicating the letter L.

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 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 lock is an essential feature of many inland waterways, enabling vessels to navigate areas where the water level changes due to natural gradients, tides, or man-made structures such as...

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 storage area designed to keep various items safe, dry, and organised while at sea. These compartments are often built into the structure of the vessel, such as under seats, within...