There are two types of MORAs – one is called a route MORA and the other is the grid MORA. Route MORAs provided an obstacle clearance within 10 nautical miles on both sides of the airways and within a 10-nautical mile radius around the ends of the airways. Grid MORAs provide an obstacle clearance altitude within a latitude and longitude grid block, usually of one degree by one degree. Minimum Off Route Altitudes [1]
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