ifr navigationFAA-published sample question (ATM, Aug 2021)
Why does the FAA maintain a VOR Minimum Operational Network (MON)?
A
To provide VOR navigation service in the Western Mountainous USA below GPS signal coverage.
B
To maintain the enroute Victor airway structure on overwater routes in the Gulf of Mexico.
C
To support navigation of non-DME/DME equipped RNAV aircraft in the event of GPS outage.✓ Correct Answer
Explanation
AIM 1-1-3 explains that the FAA is keeping a VOR MON as a backup so that aircraft not equipped with DME/DME RNAV can navigate conventionally, and reach an airport with a non-GPS approach, if GPS service is lost. It is not intended for the western mountains or Gulf airways specifically.
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