a system by which the position of a ship or aircraft can be determined by its navigator by the time interval between radio signals received from two or more known stations
See Loran in American Heritage Dictionary 4
(lôrˈănˌ, lōrˈ-)
noun
A long-range navigational system in which position is determined by an analysis involving the time intervals between pulsed radio signals from two or more pairs of ground stations of known position.