Rothco Map Compass Map Compass Is Made Of Durable And Lightweight Acrylic Plastic Ruler Measurements Along The Sides To Be Used On Your Map In Conjunction To The Map's Scale To Determine Distances Survival Compass Measures: 4 1/4 X 2 3/8 X 1/2 Outdoor Compass Is Liquid Filled And Features A Large And Easy To Read Turn Dial, Magnifying Glass, Fine Graduations, And A Lanyard