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Marine Course Plotting Protractor - $10 (Pittsfield)
condition:
excellent
make / manufacturer:
Wilfrid O. White & Sons
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This is a vintage Wilfrid O. White & Sons transparent course protractor, also known as a course plotter or chart plotter, used for marine navigation.
• It features a 360-degree rotating compass rose and a straight edge with a scale for measuring nautical miles.
• The text indicates instructions for use with magnetic compasses, involving adding or subtracting variation.
• It was produced by Wilfrid O. White & Sons, Inc., a company specializing in nautical instruments with offices in Boston, New York, and Baltimore.
• The scales are designed to be used with specific US Coast and Geodetic Survey charts, such as the 1/80000 and 1/40000 scales.