Omega was initailly planned in 1968, and was operational in 1971.
There were eight Omega stations Norway (A), Liberia (B), Hawaii (C), North Dakota (D), La Réunion (E), Argentina (F), Australia (G) and Japan (H). The station in Australia was originally intended for New Zealand but was moved to Australia after protests from anti-war protestors.
Each Omega station transmitted a very low frequency signal which consisted of a pattern of four tones unique to the station that was repeated every ten seconds. Because of this and radionavigation principles, an accurate fix of the receiver's position could be calculated.
Due to the success of the Global Positioning System the use of Omega declined during the 1990s, to a point where the cost of operating Omega could no longer be justified. Omega was permanently terminated on September 30, 1997 and all stations ceased operation.
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