1.The Expedition 4 compass is the ideal choice for outdoor enthusiasts and rescue workers who require advanced navigation tools. With its 1:25k, 1:40k, 1:50k, mm and inch map measuring scales, it top-level functionality for demanding situations. 2.This full-size baseplate compass is made for experienced navigators who require precise and advanced techniques. Its added GPS functionality and declination adjustment make it perfect for more challenging trips and rough terrains. 3.The Expedition 4 compass is built to last in the toughest weather conditions. Its robust materials and sapphire jewel bearing ensure durability and accuracy. It comes with a detachable lanyard for added and the silicon friction feet ensure that the compass reamains still on the map. 4.The magnifying lens and declination scale inside the capsule detailed map reading and navigation. Its patented red/black North/South lines provide ease of use and the rotatable compass housing makes it compatible with the 1-2-3 navigation system.