Plain English Meaning

An instrument approach where the pilot follows a radio beacon for direction and uses a distance readout to know how far they are from a fixed point on the field. The beacon tells you which way; the distance tells you how far.

Full Definition

An instrument approach procedure that uses a Non-Directional Beacon (NDB) for course guidance combined with Distance Measuring Equipment (DME) for along-track distance information. The NDB provides bearing to or from the station via the aircraft's Automatic Direction Finder (ADF), and DME supplies slant-range distance from a paired DME station, allowing the pilot to , -downs, and the by distance rather than by or by crossing a second .