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SQUARE PROTRACTOR
Also known as a "Douglas" protractor.
This protractor/plotter has been around a long time in one form or another.
It is best suited for rapid plotting of courses and bearings in a confined
space. Those who have used these for awhile, swear by them. The 5 inch
size is small and inexpensive enough that you should keep one as a spare
at the nav station. The large 10 inch size is for full sized nav stations.
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