Map your Open Water Swim with the Hydro Tracker GPS. The Hydro Tracker attaches securely to goggle straps, resting on the back of the head and does not interfere with swimming technique. Global Positioning System satellites transmit signals to the Hydro Tracker recording your course accurately, no calibration needed. Dock your Hydro Tracker to upload your swim to the free FINIS® Streamline Training Log at FINISinc.com/streamline. View a map of your route and watch time-lapse animation of your progress. Dig deeper to see key stats including elevations, splits, speed, accumulated time, distance and more. Export your progress to CSV or KML Google Earth file or share with others via a personalized link. Note: Hydro Tracker GPS is not compatible with early versions Mac OS X 10.8.x (Mountain Lion). It supports all other Mac OS X and Windows versions.