Behind the vessel, or moving in a backward direction. "Going astern" means the vessel is moving backward through the water, typically achieved by reversing the propeller.
Category: Navigation & Seamanship
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BeamThe width of a vessel at its widest point, measured at the midship section.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.CourseThe intended horizontal direction of travel measured as an angle from north.
Back to DictionaryEntry updated May 2026