12 Inch Parallel Ruler - Accurate Navigation : Plot precise bearings and course lines effortlessly with this 12-inch parallel ruler. Ideal for marine navigation, it combines the essential functions of a protractor and a basic ruler, making meridian measurements straightforward. - Durable Construction : Crafted from high-quality acrylic with a brushed aluminum arm and polished aluminum handle, this ruler is built to last. Its robust materials ensure longevity, standing up to regular use in demanding marine environments. - Precision Design : Our navigation parallel ruler features clear, engraved scales with full 180° protractor markings. When the arms are closed, the bottom edge forms the protractor center, ensuring accuracy in your measurements and plotting. - High Transparency : Enjoy unobstructed viewing of charts and maps thanks to the ruler's excellent transparency. This feature enhances your experience by allowing for smooth, accurate mapping and drawing. - User-Friendly Operation : Easily manipulate the parallel ruler with one in each hand, moving them alternately to maintain alignment. A sturdy connector provides the right tension for parallel drawing, ensuring a correct and enjoyable process. Use Scenarios : 1. Marine Navigation : Plot your course with confidence while on open waters, whether on a boat or a larger vessel. 2. Charting Courses : Perfect for planners and navigators, this ruler simplifies the process of plotting and verifying routes on nautical charts. 3. Education and Training : An excellent tool for teaching navigation principles in classroom settings or workshops, providing hands-on learning experiences. This 12-inch parallel ruler is designed for high performance and ease of use, making it an indispensable tool for navigators, educators, and maritime enthusiasts.