Plot accurate bearings or course lines with this 12-inch parallel ruler. Ideal for plotting lines of bearing or course, measuring degrees of a bearing line or course before charting, this tool combines the functionality of a protractor plotter and a parallel ruler, offering convenience for route measurement on nautical charts. Suitable for use in various marine environments, including boats and ships.Constructed with durable acrylic material, brushed aluminum arms, and a polished aluminum handle, this parallel ruler ensures long-lasting performance and reliability even with frequent use. The clear, easy-to-read scales are engraved with full 180-degree protractor markings. When the arms are closed, the center of the bottom edge aligns with the protractor center, providing a compact and functional design.The ruler offers high transparency for unobstructed viewing of chart details, enhancing accuracy and ease during navigation plotting and drawing tasks. To use, simply hold the ruler in both hands and move the arms alternately while maintaining parallel alignment. The sturdy connectors provide consistent tension, allowing for precise and smooth parallel line transfers.Color: As Shown Material: Metal Package Contents: 1 x Parallel Ruler Note: Light reflection and different display settings may cause slight variations in color between the image and the actual item. Measurement may vary by +/- 1-3 cm.