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Omega (navigation system)
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<p>OMEGA was the first global-range <a href="/facts/Radio_navigation/sRkrEaG9">radio navigation</a> system, operated by the United States in cooperation with six partner nations. It was a <a href="/facts/Hyperbolic_navigation/YSg8uWCN">hyperbolic navigation</a> system, enabling ships and aircraft to determine their position by receiving <a href="/facts/Very_low_frequency/pxpCRyKV">very low frequency</a> (VLF) radio signals in the range 10 to 14 kHz, transmitted by a global network of eight fixed terrestrial <a href="/facts/Radio_beacon/UJWrV5Nf">radio beacons</a>, using a navigation receiver unit. It became operational around 1971 and was shut down in 1997 in favour of the <a href="/facts/Global_Positioning_System/DKVLnzF3">Global Positioning System</a>. </p>