That handy little compass on the back of your Rambo knife is a neat toy to have when impressing the chicks, but when you really need to find your way, you really should be packing the Lensatic Tritium Compass. This is one tough cookie, capable of operating in temperatures ranging from 50 below to 150 plus (hot enough for ya?). A tritium light source allows you to see your bearing, even in total darkness. So even if you’re tucked in a hollow tree stump, hiding from zombies, you can plan your heading before stepping out in the open.