Gyro Flight and Directional Indicators Technical Manual TO 30-15A-4 S2 Tracker likely to indicate the maximum

likely to indicate the maximum acceptable range for a specific aircraft

and US Navy's PBY5A Catalina and PB4Y Privateer

The pointers and reset mechanism appear to work as intended

Here is an authentic WWII-era navigational plotter used by aircraft navigators to plan

very early indeed

Gyro Flight and Directional Indicators Technical Manual TO 30-15A-4 S2 Tracker likely to indicate the maximumThis is an original WWII era Technical Manual for gyroscopically operated Flight (Horizon) Indicators and Directional Indicators used across most bomber, fighter, and transport aircraft of the US Army Air Force and US Navy. This 140 page, loose leaf unbound manual reviews the basic information as well as in depth technical information on both instruments, including disassembly, repair, and maintenance. It is full of illustrations and diagrams. The