Davis Three-Arm Protractor

Davis Three-Arm Protractor uses to lay out course lines or plot fixes from multiple fixed positions obtained by a sextant or hand bearing compass. Translucent to allow overlay on a chart with full visiblity underneath. Center arm is fixed with two adjustable arms and a hole in the center of the compass rose for marking your position. Fully flexible and nearly unbreakable.

Arm length is 15" (38cm).