Housing from the Aviation automatic radio compass type ARK-5
The automatic radio compass (ARC) is an on-board automatic radio direction finder, with the help of which the KUR is determined – the direction (heading angle) to the radio beacons – drive (PRS) and broadcast radio stations operating in the corresponding wavelength range. It is automatic because it allows you to continuously receive CSD readings on the scale of a dial or digital indicator immediately after tuning the ARC to the operating frequency of the radio beacon (RM).