The width of a vessel at its widest point, measured at the midship section. Beam is a key dimension that affects stability, cargo capacity, and the ability to transit canals and locks.
Category: Navigation & Seamanship
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AbeamA direction at right angles (90 degrees) to the fore-and-aft centerline of a vessel.AsternBehind the vessel, or moving in a backward direction.BearingThe horizontal direction of one point from another, measured clockwise from true north, magnetic north, or the heading of a vessel.BowThe forward-most part of a vessel's hull, designed to reduce the resistance of the hull cutting through water.Chart DatumThe reference level from which depths on a nautical chart are measured, typically the lowest astronomical tide (LAT).Compass RoseA graduated circle printed on nautical charts showing both true and magnetic north, used to determine bearings and courses.
Back to DictionaryEntry updated May 2026