Meet your perfect planning partner. This small genius makes measuring the true course of your flight or determining the magnetic course a breeze with the twist of the azimuth. Includes scales for sectional terminal area and WAC charts in statute and nautical miles. Measures 3 1/4" x 13" and 3 3/8" diameter. Features Measure true course or determine magnetic course with one twist Includes scales for sectional terminal area and WAC charts Measures in statute and nautical miles