Compass, Hand Bearing, Type O.6.A., Ref 6A/1248, with Original Case JU-52 Measures ~8 inches long and

Measures ~8 inches long and ~4

describes the installation

which is engaged by turning a small knob on the side

That's about all I can determine without having a manual

Shows aircraft deviation from the selected course

Compass, Hand Bearing, Type O.6.A., Ref 6A/1248, with Original Case JU-52 Measures ~8 inches long andHere is a WWII era Hand Bearing Compass, Type O. 6. A., in its original wooden case, as used in aircraft of the British RAF Coastal Command. The 06. A. is hand held compass, used by an observer (hence the "O" designation. Reference numbers for pilot compasses began with "P") to take navigational bearings in situations where a fixed compass could not be used, or to determine correction factors for fixed compasses. The handle holds batteries (not