Sure, a watch's main duty is to do one thing—tell time. But the small accessory can make a big difference in helping guide and track where you're at, especially when that "where" is outside. Maybe it's in the wilderness, maybe it's out for a jog along the river. Whatever your adventure, sustained activity in the outdoors can be optimized with the right tools. A watch with capabilities like a built-in GPS or specialized lighting has the power to make your treks safer. Here, the 10 best watches for getting outside.