United Services Automobile Association (USAA) Oral Practice Test

MOCA stands for Minimum Obstacle Clearance Altitude. This altitude on IFR enroute charts guarantees obstacle clearance for the route segment and also ensures reliable VOR reception within 100 nautical miles of the VOR that defines the airway. Beyond that 100 NM range, VOR reception isn’t guaranteed, even though obstacle clearance remains the focus within the 100 NM zone. The other options don’t match the standard aviation term: the word “Operational” isn’t used in this context, and “Maximum Obstacle Clearance” would be the opposite of what MOCA provides. The phrasing “Minimum Obstruction Clearance Altitude” is not the accepted term either.