The PJ-1 Rotating Azimuth Plotter makes measuring the true course of your flight or determining the magnetic course a breeze with the twist of the azimuth. Features 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.