Jean Cras course ruler in black from Topoplastic. This navigation plotter enables genuine one-handed navigation - no second triangle or ruler is required and the second hand remains free for drawing or holding. No more confusion of course values due to two scales, flexible, no moving parts - therefore durable, robust and ideally suited for everyday use on board professional ships, yachts or aeroplanes. Incl. description (French) and instruction sketch. - Dimensions: 38 x 10 cm - Thickness: 1mm - With 2 degree scales - centimetre and nautical mile scale (1: 1000,000)