General description Made of premium acrylic sheet, this Marine Parallel Ruler is designed for drawing lines bearing line or course, making it an essential tool for navigating nautical charts. Its sturdy links provide the right amount of tension for drawing lines parallel to another line or reference point, ensuring precision in your measurements. Technical specifications Material: Acrylic sheet Length: 450 mm Measurement allowed error: +/- 1-3 cm Usage Designed to draw lines bearing line or course Engraved scale for accurate and easy visibility Good transparency to avoid obscuring information Can be used with two hands for better control Other information