What is the purpose of MRA in aviation?

The purpose of MRA, or Minimum Reception Altitude, is to indicate the minimum altitude at which a pilot can expect to receive reliable navigational signals, particularly from VHF Omnidirectional Range (VOR) stations and other radio navigation aids. This is crucial during flight operations because it ensures that pilots have adequate signal strength to navigate safely and effectively.

When flying at or above the MRA, pilots can be more confident in their navigation, as it minimizes the risk of signal loss or degradation that can occur at lower altitudes due to terrain or obstacles. Thus, adhering to the MRA helps enhance situational awareness and safety during flight.

Understanding the specific function of MRA is important, as it is distinct from altitudes related to route maximums, landing requirements, or adjustments—each of which serves different navigational and safety purposes.