Chart Plotting Board Mark-7 US Navy MIL-B-5046A PZL This was stored in any

This was stored in any aircraft of the US Army Air Force or US Navy that may fly over water

It indicated outside air temperature from -45deg to +45deg C

Comes in the original Luxor-Airex aluminum carrying case that has raised letters and logo on the top

The purpose of the upright bracket is unknown

and a recording base

Chart Plotting Board Mark-7 US Navy MIL-B-5046A PZL This was stored in anyThis is an authentic US Navy pilot's Chart Plotting Knee Board Mark 7 (MIL B 5046A), likely 1950's to Vietnam War era. This is a pretty impressive kit. Likely designed for a jet aircraft (note fuel is measured in lbs), this 9. 5 x 7 x 1 inch device included the flight computer on the face with a rotating card for determining the critical factors impacting the planned flight. By depressing a button in the lower right corner, the top flips open to