What is the use of an Automatic Direction Finder (ADF)?

The Automatic Direction Finder (ADF) is primarily used to determine the direction to a non-directional beacon (NDB). NDBs transmit signals in all directions, and the ADF receiver in the aircraft can pick up these signals. The system provides a directional indication to the pilot, indicating where the beacon is located relative to the aircraft's current position. This capability is essential for navigation, especially in situations where visual references are limited, such as during low visibility conditions.

Using ADF, pilots can track their position in relation to the ground-based NDB stations, allowing them to navigate along specific courses to and from these beacons. This method of navigation is beneficial, as it enables pilots to navigate efficiently in areas without other navigational aids or when flying over featureless terrain. The effectiveness of the ADF lies in its ability to provide continuous updates to the pilot regarding headings to the beacon, which is crucial for maintaining situational awareness and safety during flight operations.