Omega was a worldwide, ground-based radio navigation system, operating in the very low frequency (VLF) band between 10 and 14 kilohertz (kHz). It was operated by the United States Coast Guard, in partnership with six other nations, from the early 1970's until 1997 when it was decommissioned. The system worked by generating hyperbolic lines of position (LOP) by means of phase difference measurements of VLF time-shared transmissions emitted by widely spaced antennae. Omega was a very long-range Very Low Frequency (VLF) navigation system and the first navigation system providing true global coverage.
