The SILVA Expedition Series is for experienced users and professionals. The Expedition series has been a global leader when it comes to accuracy, precision and durability for many years. Compass housing made from Dryflex™ - rounded base plate – comfortable and fits any hand size Patented red/black orienting lines – easy and “fool proof” to take bearings Map measuring scales mm, inch Romer scales, 1:25k, 1:40k, 1:50k – compatible with basically any map. Luminous markings - enables night navigation Friction feet – increases precision in map work Hole for marking positions on map with pen/pencil – increasing precision Built in magnifier for detailed map reading