After a foray into lower-priced offerings, Suunto is back to focusing on its group of hardcore users, like ultrarunners, backpackers, and mountain guides. While most GPS watches offer around 10-15 hours of continuous tracking, Suunto’s FusedTrack algorithm offers up to 120 hours by using motion sensor data to extend the time in between GPS pings. The watch also automatically switches battery modes if it notices you running low during an exercise, and warns you to charge before big events. I found it a little big to wear, and Suunto’s app is a horror—you’d be better off using one of their partner apps, like TrainingPeaks. Still, you will never end a long, grueling race to find out that your watch didn’t track a thing.