What does MOCA stand for?

MOCA stands for Minimum Obstruction Clearance Altitude. This term is used in aviation to indicate the lowest altitude that provides the necessary clearance over obstacles in a defined area, ensuring safe navigation. The MOCA guarantees that aircraft will be safely above terrain and obstacles within a specific distance from the navigation aid (NAVAID) that it is associated with, even if the altitude does not guarantee coverage of the surrounding airspace.

Choosing MOCA is essential for pilots, particularly when flying in mountainous or obstacle-rich environments, as it helps maintain safety by ensuring adequate vertical separation from known obstacles. Understanding MOCA is critical for flight planning and in-flight navigation, as it enhances situational awareness regarding terrain clearance and safety margins during operations.