The Automatic Direction Finder (ADF) system is a navigational aid. It provides bearing to selected ground stations and is used as an audio receiver. It processes frequencies from 190 kHz to 1750 kHz. This includes the standard AM broadcast and low frequency non-directional beacons.
The ADF control panel is used to select the operating frequency of the system. The system always operates in the ADF mode. In this mode, the system can use the sense antenna input to receive AM radio or weather broatcasts. By using both sense and loop antenna inputs, the system can also determine bearing to the selected station. This bearing data can be displayed on RDMI or RMI and EHSI (if installed).