This is the parallel rule to use for your chart work. Made of strong acrylic and brass arms it is designed for both classroom and onboard use.
• Captain Fields pattern, divided with protractor markings (double reading) and compass points.
• Manufactured from high quality 6mm acrylic
• Bevelled on all four edges with solid brass links
• All other metallic parts are manufactured from non-corrosive materials
• Rubber pads are fitted to the underside to prevent slipping