Compact, lightweight, and weatherproof, this set of Quick Reference Navigation Cards from Brunton will help you navigate and explore the backcountry. Each 3.7 x 2.5 x 0.1" card includes tricks and techniques for map reading, determining locations, and calculating distances, along with survival skills such as hydration and knot-tying. The cards work with metric and Imperial map scales and can be used with any map and compass. The set is designed to stow neatly in the rubber foot of the Brunton TruArc20 compass.