Heavy-duty, flexible acrylic construction is the foundation for this easy-to-use, professional three arm protractor, which is ideal for laying out course lines or plotting fixes from multiple fixed positions obtained by a sextant or hand bearing compass. Overlay it on a chart for full visibility underneath. The center arm is fixed with two adjustable arms. The hole in the center of the compass rose makes it easy to mark your position. The Three Arm Protractor can be used to position and chart from three identifiable shore, landmark or buoy locations. Simply measure the angles on the protractor and locate your position on the chart.
Moveable arms with vernier scale for precise measurements