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

Grid MORA (Minimum Off-Route Altitude) is designed to provide safe obstacle clearance within a specified grid square on a sectional chart, specifically for airspace that is 5,000 feet or less above ground level (AGL). By maintaining an altitude at or above this level, pilots can ensure they are flying high enough to avoid any obstacles, such as buildings or terrain features, that may exist within that grid square.

This means that for all altitudes up to and including 5,000 feet, the grid MORA provides necessary obstacle clearance, making it a critical tool for flight safety in low altitude operations. Operating at the grid MORA ensures that pilots maintain a safe distance above known hazards, allowing for safer navigation and reduced risk of collision with unmarked obstacles.