NDB navigation consists of two parts — the automatic direction finder (ADF) equipment on the aircraft that detects an NDB’s signal, and the NDB transmitter.

How does ADF and NDB work?

The ADF/NDB navigation system is one of the oldest air navigation systems still in use today. … The result is a cockpit instrument (the ADF) that displays the aircraft position relative to an NDB station, allowing a pilot to “home” to a station or track a course from a station.

How do you determine if your ADF is receiving an NDB signal?

Automatic Direction Finder Receivers: Pilot can rotate the face of the card. The ADF needle will directly indicate the magnetic bearing to the NDB when the aircraft heading is shown at the top.