a medium or low-frequency system of radio navigation by which interrelated pulses transmitted from ground stations are received in a craft. The position of the craft can be determined by observing the interval between pulses from pairs of stations and plotting them on a special map. Note: Loran-C (100 kHz) for great distances; Loran-D is a shorter range version., suure tegevusraadiusega navigatsioonisüsteem