This sturdy 12-inch (30.48cm) parallel rule with brushed aluminum arms is inscribed with a protractor scale. It is used to plot direction on a nautical chart from any convenient meridian or compass rose. The two straight-edged rules are connected to maintain the same angle. By walking the rules across the chart and securely holding down the non-moving rule, you can effectively plot a course. 12-inches (30.48cm) long Includes protractor scale Brushed aluminum arms Polished aluminum handle Milled acrylic with beveled edges Protective plastic sleeve Length: 12 in (30.48 cm) Width: 2.5 in (6.35 cm) Height: 0.5 in (1.27 cm) Weight: 0.4 lb (1.27 cm)
