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The Omega worldwide VLF radio navigation system is discussed. Following a brief historical perspective, the current and projected system configurations are described with emphasis on the operational characteristics of transmitting station equipment. The Omega positionfixing process is examined and the available user equipment is reviewed. The characteristics of VLF radio wave propagation, which have a significant impact on Omega navigation accuracy, are discussed. Finally, the various elements of the Omega user community are described along with the likely nature of future increased applications of the Omega navigation system.