Plain English Meaning
A cockpit instrument that points toward a chosen radio station on the ground, so the pilot can see which direction that station lies relative to the aircraft's nose.
Full Definition
An aircraft radio navigation receiver that automatically determines the bearing to a selected ground-based non-directional beacon (NDB) or other low/medium-frequency radio station, displaying the relative bearing on a cockpit indicator.
Context Anchor
Seen in older radio navigation, instrument training, and procedures that use ground .