Which of the following altitudes do grid MORA ensure obstacle clearance over?

Grid Minimum Off-Route Altitude (MORA) is a safety measure used in aviation to provide obstacle clearance in the area surrounding an aircraft's flight path. Specifically, it ensures that, within a defined grid of airspace, the aircraft has a vertical buffer above the highest obstacle, including terrain and man-made structures, plus an additional safety margin.

When the answer indicates that grid MORA provides obstacle clearance over altitudes of 5,000 feet or less, it highlights that for these lower altitude flights, the minimum safety margins designated by MORA are crucial for preventing accidental collisions with terrain or obstacles. It is designed to ensure that pilots can navigate safely, especially in areas where airspace may be cluttered or features such as mountains can pose significant risks.

Choosing an altitude above 5,000 feet may not align with the specific goals of grid MORA, as those higher altitudes may have different navigational and regulatory requirements. Thus, the focus on ensuring adequate obstacle clearance in environments where aircraft typically operate at or below 5,000 feet reinforces the importance of this safety standard for flight operations in varied terrain.