Davis One-Arm Protractor

Davis One-Arm Protractor lay 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.

Dimension: 38cm overall length with a 12cm square base.