MOCA's provide obstacle clearance and acceptable navigation signal coverage within ___ NM of the NAVAID.

MOCA's provide obstacle clearance and acceptable navigation signal coverage within ___ NM of the NAVAID.

• A. 22
• B. 12
• C. 40
• D. 50

Answer: (A)

MOCA stands for Minimum Obstacle Clearance Altitude. It not only provides the required obstacle clearance along the published route, but it also guarantees usable VOR signal reception out to a fixed radius of 22 nautical miles from the NAVAID. Within that 22 NM zone you can rely on both obstacle clearance and the navigation signal; beyond it, signal reception isn’t guaranteed even if you’re at the MOCA altitude. That’s why 22 NM is the correct distance.

MOCA stands for Minimum Obstacle Clearance Altitude. It not only provides the required obstacle clearance along the published route, but it also guarantees usable VOR signal reception out to a fixed radius of 22 nautical miles from the NAVAID. Within that 22 NM zone you can rely on both obstacle clearance and the navigation signal; beyond it, signal reception isn’t guaranteed even if you’re at the MOCA altitude. That’s why 22 NM is the correct distance.