A method of estimating a vessel's current position by advancing a known position using the course steered, speed through the water, and time elapsed. Dead reckoning does not account for the effects of wind, current, or tidal streams.
Category: Navigation & Seamanship
On The Maritime
The desks that work with Navigation & Seamanship terms.
Related terms
More in Navigation & Seamanship
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.Course Over GroundThe actual direction of a vessel's movement over the earth's surface, as determined by GPS or other positioning systems.DraftThe vertical distance between the waterline and the lowest point of a vessel's hull, indicating how deep the ship sits in the water.DraughtThe British English spelling of draft, referring to the depth of water a vessel draws.ECDISElectronic Chart Display and Information System, a computer-based navigation system that complies with IMO regulations and can be used as an alternative to paper nautical charts.
Back to DictionaryEntry updated May 2026