We only know how to go big, and the COROS VERTIX 2S GPS Adventure Watch goes there with us. Whether we're striding in 100+ mile races or freeclimbing up big walls, the VERTIX 2S connects to five satellite systems at the same time in dual frequency to ensure we always know exactly where we are-all while the storm, nutrition, and course deviation alerts, as well as the sunset/sunrise times, keep us prepared. Along rough rock and through overgrown trails, the bomber construction resists dings and abrasions, and as we test our grit, the heart rate and blood oxygen tracking help us manage our effort.