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Decca navigation system

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Decca navigation system

Radio-based aid to marine navigation, used from World War II until 2000. The system consisted of a master radio transmitter and two or three secondary transmitters situated within 100–200 km/60–120 mi from the master. The signals from the transmitters were detected by the ship's navigation receiver, and slight differences (phase differences) between the master and secondary transmitter signals indicated the position of the receiver. It was first used in 1944 for the D-Day landings. It has been superseded by other systems, principally GPS (Global Positioning System).

The system could be used up to 550 km/344 mi from the master transmitter, and was accurate to within 50 m/160 ft at a range of 180 km/112 mi.



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