What is the acceptable navigational signal coverage distance from the VOR at the MOCA?

The Minimum Obstruction Clearance Altitude (MOCA) is designed to provide a minimum safe operating altitude that ensures clearance from obstacles while offering acceptable navigational signal reception. The MOCA guarantees signal coverage for at least 22 nautical miles (NM) from the VOR. This distance allows pilots to receive consistent, reliable navigation signals, which are crucial for maintaining safe and accurate flight paths in areas where the terrain may be challenging or where obstacles could pose a hazard.

In practice, when operating below the Minimum Enroute Altitude, understanding the MOCA and the associated navigational signal coverage helps pilots make informed decisions regarding their route and altitude choices. The other distances mentioned (12 NM, 25 NM, and 35 NM) do not align with the established MOCA guidelines, making 22 NM the only correct choice for ensuring safe and effective navigation in the vicinity of a VOR.