The COROS APEX 4 46mm Watch is built for the days a GPS watch usually can't finish. A titanium bezel and sapphire glass hold up to real alpine abuse, while dual-frequency GPS and vertical algorithms keep the track accurate through dense forest, steep couloirs, and sheer rock walls. Up to 65 hours of battery life in Endurance GPS mode means the watch outlasts the effort, not the other way around. What Our Gearhead® Experts Are Saying:"I ran a hundred-mile loop without charging once, and the elevation track never wandered even when the walls closed in on the couloir sections. That's the first watch I've trusted to just keep working instead of counting down."