Check the listing for details. Protractor Triangle (Weem & Plath 103). Listed at 24.90 USD. Protractor Triangle (Weem & Plath 103) Often used in a combination of two, our Protractor Triangle provides a straightforward method of plotting and performing chart work. Each triangle is inscribed with black markings. The protractor scale on the triangle can aid in drawing a bearing line on a chart, and the 90° angle is helpful when determining lines of position. 7-3/4" sides x 11" (19.69cm x 27.94cm) hypotenuse Protractor scale allows easy alignment with chart meridian in any direction Direction is maintained as one triangle is slid along the other to desired position 90° angle helps determine lines of position Made from clear, durable vinylite Lifetime warranty Length: 11 in (27.94 cm) Width: 5.8 in (14.73 cm) Height: 0.12 in (0.3 cm) Weight: 0.2 lb (0.3 cm) UPC Code: 721002003140 HTS Code: 9017.20.8080