We've seen lots of devices that track your every move so you can pour over the data post-workout, but many aren't so great when wet. If you've got a open water swimmer in the family, Finis has just the thing: the Hydro Tracker GPS, which hooks onto your goggle straps and records your workout. It's not just for swimming — it comes with an armband, too, so you can track your running, biking, skiing, hiking, and more. The waterproof GPS unit lasts up to 16 hours and it tracks your speed, elevation, distance, splits, and overall time elapsed. There's no screen on it, so you'll have to sync with your computer to take a look at your route on Google Maps, view your performance, and set goals. The Hydro Tracker GPS is available now for $129.99 from Finis' website.