Glossary Archive

Turbulence behind a vessel. Not to be confused with wash

A strong rope or line used for mooring, towing, or manoeuvring a vessel, particularly in situations requiring precise control.  Warping is a traditional and essential technique in maritime operations, particularly useful in harbours, narrow waterways, or when precise vessel positioning is required. The verb "to warp" refers to the act of moving a vessel by...

The waves created by a vessel. Not to be confused with wake.

Removable boards or panels used to close off the companionway of a boat to prevent water from entering the cabin. Wash boards are an essential feature on many boats, particularly sailboats, where they serve as a barrier to protect the interior of the vessel from water ingress, especially in rough seas or heavy weather. Typically,...

A designated period during which a specific crew member or group is responsible for the safe operation and navigation of the vessel. In maritime contexts, a "watch" is a crucial aspect of shipboard life, especially on longer voyages where the vessel is in continuous operation. The crew is divided into shifts, or "watches," ensuring that...

The length of the vessel at the point where it sits in the water. It excludes the total length of the boat, such as features that are out of the water, like a bowsprit. Most boats rise outwards at the bow and stern, so a boat may be quite a bit longer than its waterline...

The vessel’s course through the water, derived from the compass course steered, allowing for leeway but not tide. A line representing the water track is drawn on a chart using a single arrow at its centre, pointing in the direction of travel. Download this crib sheet for all annotations used when plotting vectors on a...

Speed, progress, or momentum through the water. More technically, the point at which there is sufficient water flow past a vessel's rudder for it to be able to steer.

A specific location or reference point on a navigational route, often used to mark progress or changes in course. A waypoint is a predetermined geographical location that is used in navigation to help guide a vessel along a planned route. These points are typically defined by coordinates, such as latitude and longitude, and are entered...

The International Maritime Signal Flag Whiskey. Meaning I require medical assistance.