5" Douglas Protractor 127 mm

The Douglas Protractor combines the functionality of a protractor and a parallel rule in one practical navigation tool. Measuring 127mm (5") square, it is supplied in a durable, reusable cardboard sleeve for convenient storage and protection.

The Douglas protractor is designed to assist in laying a course or bearing, reading a bearing, finding departure or latitude between two positions, finding a magnetic course, and fixing graduations in 1 increments.