Electronic 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. ECDIS integrates real-time positioning with electronic navigational charts to enhance situational awareness.
Also known as: Electronic Chart Display and Information System.
Category: Navigation & Seamanship
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Dead ReckoningA method of estimating a vessel's current position by advancing a known position using the course steered, speed through the water, and time elapsed.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.Great CircleThe shortest distance between two points on the surface of a sphere, formed by the intersection of the sphere with a plane passing through its center.HeadingThe direction in which a vessel's bow is pointed at any given moment, measured in degrees from north.KnotA unit of speed equal to one nautical mile per hour, approximately 1.852 kilometres per hour or 1.151 miles per hour.
Back to DictionaryEntry updated May 2026