Three Arm Protractor

Heavy duty, crystal clear acrylic construction is the foundation for this simple to use, professional plotting aid. Arms are rigid enough to trace a bearing line. Can be used to position and chart from three identifiable shore, landmark, or buoy locations. Just measure the angles on the protractor and locate your position on the chart. Moveable arms have a vernier scale for even more precise measurements. Dims: 6" x 21". Wt. 5 oz.