Omega Navigation System
The Omega Navigation System is a very-low-frequency (VLF) global radio navigation system that was operational from the 1970s until 1997. It used eight ground transmitters operating between 10 and 14 kHz to provide worldwide navigation coverage through hyperbolic phase-difference measurements.
Historical Significance
Omega was one of the first global navigation systems, providing worldwide IFR navigation for long-range aircraft before the GPS era. It was used extensively for transoceanic navigation and in remote areas without VHF navaid coverage. The system was shut down in September 1997 following the full operationalization of GPS.
Current Status
Omega is completely decommissioned. Modern aircraft use GPS/GNSS for all long-range navigation. Omega is only relevant to aviation history and some historical instrument exams.