CYA Navigation Plotter

Lexan resin plastic navigation plotter will never warp, melt or break in high temperature !
It measures 7-7/8” * 2-1/2”, designed for topographical and radio navigation.
1: 500,000 NM scales on one side, 1: 250,000 NM on the other side, and the outside edge shows on each side with conventional protractor degrees. Magnetic or true headings are simultaneously obtained from the compass rose by simply aligning horizontal centre line with desired track.