Naval Course Corrector, Mounted for Display Gunnery The manual appears to be

The manual appears to be complete with ~1

and installation of these gunsights

The compass is affixed to a mounting bracket

part number 643770

thus following the airspeed index on the inner scale

Naval Course Corrector, Mounted for Display Gunnery The manual appears to beThis large shiny metal device is a WWII era naval Course Corrector, used to convert, mechanically, a ship's True Course to Magnetic Course and to Compass Course when variation, deviation, or compass error is known. Two inner dials labeled Magnetic Course or Bearing and Compass Course or Bearing rotate within the outer ring labeled True Course or Bearing. A mechanical arm rotates around the axis with locking screws to capture its position on the two