The National Airspace System includes hundreds of Very High Frequency Omnidirectional Ranges (VORs) that have provided primary, ground-based navigation in all phases of flight since the 1950s. A Minimum Operational Network (MON) supports the NAS transition from VOR-based routes to more efficient Performance Based Navigation (PBN) consistent with NextGen goals.
The VOR MON is the minimum number of VORs geographically situated in the Lower 48 states that are necessary to provide:
Coverage at and above 5,000 feet above ground level enabling pilots to revert from PBN via satellite to ground-based navigation for approach, terminal and en route operations in the event of a GPS outage;
And the assurance that at least one airport will be within 100 nautical miles where an approach procedure via an instrument landing system/localizer or VOR can be flown without the necessity of GPS, Distance Measuring Equipment (DME), the Automatic Direction Finder System (ADF) or surveillance.
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