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from today's DME/N) to provide the slant range distance, were developed in the United States as part of a U.S. civil/military program for Aeronautical Navigation Aids in 1945. Deployment of VOR and DME₍₁₉₅₀₎ began in 1949 by the U.S. CAA (Civil Aeronautics Administration). ICAO standardized VOR and DME₍₁₉₅₀₎ in 1950 in ICAO Annex, Edition 1. Frequencies for the use of VOR are standardized in the very high frequency (VHF) band between 108.00

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