The Minimum Reception Altitude named MRA is the lowest altitude on an airway segment where an aircraft can be assured of receiving signals from navigation aids like VOR or NDB.
Typically, the greater the distance between navigation aids, the higher is the MRA.
On NOS charts it is described with a flagged R. On Jeppesen charts it will say the altitude plus MRA.
MRA is becoming less important with the availability of GPS satellite navigation, which allows aircraft to get navigational guidance all the way down to the ground.
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