plot accurate bearings or course lines with this 12 inches parallel ruler; Using to plot lines of bearing or course, degrees of a bearing line or degrees of a course before charting, this tool combines the basic functions of a protractor plotter and a basic parallel ruler, it brings convenience to meridian measurement routes; Making it ideal for use in various environments, including boats and ship<br> embrace the longevity that this parallel ruler marine offers thanks to its construction from quality acrylic material with brushed aluminum arm and polished aluminum handle; The use of quality material ensures durability, coupled with long lasting service, standing up to the test of time even under frequent use<br> the scales of our navigation parallel ruler are clear and easy to see; It is engraved with full 180 protractor markings; When the arms are closed, the middle of the bottom edge forms the protractor center, ensuring you have all the tools you need in one compact design<br> this parallel ruler navigation boasts a good transparency to ensure unobstructed viewing of information during use; This feature significantly improves your user experience, making for smoother, more accurate mapping and drawing<br> you just need to hold the marine navigation parallel ruler in each hand and move parallel to each other alternately; Sturdy connector with appropriate tension can be applied parallel to another ruler or as a reference, ensuring your parallel drawing process is not just correct but also enjoyable<br> Colour:As Shown<br> Material:Metal<br> Package Contents:<br> 1 x parallel ruler<br> Only the above package content, other products are not included.<br> Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.