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Omega navigation system
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Omega navigation system

Former long-range radio-based aid to navigation, giving world-wide coverage. There were eight Omega transmitting stations, located in Norway, Liberia, Hawaii, Réunion, Argentina, Australia, USA, and Japan. The very-low-frequency signals from the transmitters were detected by a ship's navigation receiver, and slight differences (phase differences) between the signals indicated the position of the receiver. The system was accurate to within 4 km/2.5 mi during the day and 7 km/4 mi at night. It was discontinued in September 1997 with the advent of the Global Positioning System (GPS). See also Decca navigation system.
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