This apparatus is used to determine the direction from which a radio wave is sent and the location of the sending station. It consists of a coil of wire wound around a frame and mounted on a vertical shaft which can be rotated. The radio wave is received by the operator, being loudest when the coil is at right angles to the wave and ceasing when the coil is parallel to the wave. Positions are determined by plotting the bearings to two known sending stations. The apparatus is especially valuable when a vessel is sufficiently close to the shore to contact two sending stations.
Isixhobo esisetyenziswa ukubonisa isalathiso ekulapho amaza eradiyo athunyelwa khona kunye nendawo yesikhululo ekuthunyelwa kuso.