Position line, Line of Position (LOP)

A line drawn on a chart to pass through the position of your boat. If you take a bearing of a fixed object ashore and draw the corresponding line seaward from that object, it is assumed to pass through the observation point – your vessel. A position line may be obtained by a visual bearing, a radio bearing, by a Transit or Range, by Soundings, or by a sextant sight of a star or planet.