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Weems & Plath Professional Protractor Triangle

Weems & Plath
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Slide two triangles to transfer course or bearing
Place protractor vertex over meridian of longitude to determine course or bearing
Hole at the vertex of the protractor allows the point of the divider or pencil to be placed on a meridian for a quick accurate course measurement

Amazon.com Price: $15.00 (as of 19/04/2017 02:37 PST- Details) & FREE Shipping.

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Weems & Plath Professional Protractor Triangle
Slide two triangles to transfer course or bearing
Place protractor vertex over meridian of longitude to determine course or bearing
Hole at the vertex of the protractor allows the point of the divider or pencil to be placed on a meridian for a quick accurate course measurement
A string fixed through the hole can be used on a chart to determine a long distance course.

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