Radio Compass Indicator I-81-A Sparks of SCR-269-G and AN/ARN-7 F6F Hellcat which were selected by rotating

which were selected by rotating the center knob below the frequency band window

The dial in the lower center is a stopwatch

5 inches deep

this was for the front reserve tanks

and the bomb bay droppable tank

Radio Compass Indicator I-81-A Sparks of SCR-269-G and AN/ARN-7 F6F Hellcat which were selected by rotatingThe I 81 A Radio Compass Indicator (aka Pilot's Bearing Indicator) is a component of the Radio Compass SCR 269 G system (which evolved into the AN ARN 7), used during WWII. According to the Airborne Radio Equipment Handbook of the Air Service Command dated 1943, this system appeared in versions of the US Army Air Force bombers B 17, B 24, B 25, B 26, B 29, and transports C 46, C 47, and C 54, as well as in any models of these aircraft used by the US