Glossary Archive

Ropes or lines used for securing the vessel alongside.

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

Removable planks fitted in the cabin entrance to prevent water getting in

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 waypoint is a specific geographic location or position used in navigation, typically identified by its coordinates (latitude and longitude). Waypoints are used to plot a course or route, serving as reference points to help guide the navigation and track progress along the intended route. Waypoints can be physical features such as buoys, landmarks, or...

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

The tendency of the vessel to turn her bow to windward making it necessary to turn the rudder to maintain a straight heading