Aviation gyromagnetic radio compass indicator, model UGR-1. It is designed to indicate aircraft heading, radio station bearings, turn angles, and course angles. The device is equipped with an internal sliding scale (from 0 to 360°) and an external fixed scale. It is used on aircraft such as airplanes and helicopters. The pointer has: 1. An internal sliding scale from 00 to 3600 with a division value of 20 2. An external fixed scale from 00 to 3600 with a division value of 100 3. A narrow ARC (automatic radio compass) arrow, the narrow end of which shows the direction to the radio station. 4. A wide pointer (course reference pointer), which rotates together with the inner scale or separately using a rack. Readings of the UGR MK (magnetic heading) - on the inner scale opposite the double triangular index. MPR (magnetic bearing of the radio station) - on the inner scale opposite the sharp end of the ARK pointer. MPS (magnetic bearing of the aircraft) - on the inner scale opposite the blunt end of the ARK pointer. KUR (course angle of the radio station) - on the outer scale opposite the sharp end of the ARK pointer.