Weems & Plath 103 Protractor Triangle all black scale

This triangle is inscribed with black markings. Using two 45 degree triangles provides an easy method of plotting and performing chart work. With its protractor scales the triangle is easily aligned in any direction with a chart meridian. Direction is maintained as one triangle is slid along the other to the desired position. Durable clear vinylite. Short sides 7-1/2" .08" thick.- SKU: WMPT055