13 Deluxe Color Azimuth Compass Rose Navigation Plotter by APR Accurately measure course lines, Plot intended flight course lines, Solve off-course problems Determine bearings to and from, Plot true & magnetic north lines, Establish flight plan check point A Sectional Chart side and a WAC Chart side, Superior for use in the cockpit at night Top/ bottom graduations for statute and nautical scales, Rotatable azimuth compass ring Opaque white backgrounds and creative graphics for easier reading of scales, 4 Protractor scales