  Davis
One Arm Protractor
aka. Course Protractor
Lay the One-Arm Protractor on any line of meridian to draw course lines. Especially handy on charts where the compass roses are few and far between. Base allows true course and reciprocal course to be read at the same time. Includes east/west variation scale and reads in degrees and compass points – 32 points to the scale. Made of durable, flexible clear plastic. 15-1/8" (38 cm) overall length with a 4-5/8" (12 cm) square base.
No longer available
Check out the Weems & Plath Three Arm Protractor.
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