Were big fans of Nikes Sportwatch GPS, but we do wish that the wearable would double as an activity tracker when were not sprinting round the block. Polar seems to feel our pain, and has welded together an activity tracker and a GPS watch for its latest CES gadget. The Polar V800 has integrated GPS with multi-sport profiles thatll record your performance no matter what youre doing, will record your heart rate and even your altitude.