The combat mission plotter PLU-6/C as per MIL-P-87133 (2 May 1978) is a plotter that is used while planning low-level flights.

It contains a protractor, time-minute scales used for adding marks every minute along the track, time-in-turn scales for doing the same in turns at various bank angles and air speeds, a nautical mile scale for distances, a 1000 meter grid for plotting exact coordinates on a 1:250 000 scale map and some figures used for various annotations on the map.
This file was prepared using applicable parts of the standard as available at http://www.tpub.com/content/MIL-SPEC/MIL-P/MIL-P-87133/index.htm

NOT FOR NAVIGATIONAL USE, or if you insist: Use at your own risk.
Own work
Johan G