How is the MAP defined for a non-precision approach?

The Minimum Approach Procedure (MAP) for a non-precision approach is defined by the use of Distance Measuring Equipment (DME), navigational aids (NAVAID), or timing. This is essential because non-precision approaches do not have an electronic glide slope to guide the aircraft down to the runway. Instead, pilots rely on various techniques to determine their position relative to the airport and the safe point to discontinue the approach if visual references are not established.

Using DME provides a specific distance that helps pilots to know at what point they should turn around or execute a missed approach. Similarly, NAVAIDs can provide necessary navigational information. Timing is also employed to ascertain when to initiate the missed approach if the descent to the airport is not successful, ensuring that pilots have multiple strategies for determining the appropriate MAP. This multi-faceted approach is crucial for safety during non-precision landings, illustrating the complexity and the necessity of the procedures involved in these types of approaches.