on irectional eacon A radio station that broadcasts its signal in all directions, like the Air Traffic Control Beacons used to guide aircraft, or your local AM radio station.
Non-Directional Beacon - an older type of electronic navigation aid, basically a low-power AM radio station
Abbreviation for: non-directional beacon Fr: NDB
Non-directional beacon; radio-navigational aid
Low frequency non-directional beacon
non-directional beacon. A medium-frequency navigational aid which transmits non-directional signals, superimposed with a Morse code identifier and received by an aircraft's ADF.