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how they work
for many years
Chart Image Size: 46" x 31"
usually once or twice a year
5" Square Protractor PUB 102 how they workSometimes referred to as a Douglas protractor, the Square Protractor is best suited for rapid plotting of courses and bearings in a confined space. Overview Suitable for plotting courses and bearings on land or sea. Notations can be made directly on matte plastic surface with pencil. Instructions included. Specifications Douglas protractor Rapid plotting of course in a confined space
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