What is the distance for acceptable navigational coverage at the Minimum Obstruction Clearance Altitude (MOCA) from a VOR?

The correct choice is based on the regulations surrounding navigational coverage when using a VOR in relation to the Minimum Obstruction Clearance Altitude (MOCA). The MOCA provides a specific altitude, which ensures that all obstacles are cleared within a certain distance of the VOR while maintaining a minimum level of navigational signal reception.

When routing through an area served by a VOR, the MOCA guarantees that the aircraft will be able to receive reliable navigational signals up to 22 nautical miles from the VOR. This distance is critical for ensuring safe navigation and obstacle clearance. The 22 nautical miles includes the requirement that the navigational signal quality remains adequate not only for route navigation but also for altitude maintenance and obstacle avoidance up to that range.

The other distances listed do not align with regulatory standards for MOCA coverage from a VOR. Thus, 22 nautical miles stands out as the correct answer for acceptable navigational coverage at MOCA, ensuring pilots have the necessary information to navigate safely and effectively.