The Don Barrow Super 1:50,000 Romer is used by navigators for plotting map refences onto 1:50,000 scaled maps. Whatever the event - scatter rallying, 12 car rally, plot & bash, historic road rallies, using the original pear drop design for speed plotting, the non-glare white matt finish with big bold numbers makes it easy to read.Don Barrow Super 1:50,000 Romer features  Only one scale to concentrate on. No others to distract or confuse you Holes for plotting quiet zones And plotting (OOB's) Out of Bounds 100m, 200m, 300m, 400m, 500m Radii All the main compass points Simple outer edge measuring scales In both miles and kilometres Extra hole to attach a cord, which then hangs the Romer for instant use Size 77mm x 77mm