If there was ever an argument to integrate GPS functions into watches, this would be it. The Chinese-made "Wrist GPS Tracker" claims to be the smallest gadget of its kind, providing satellite tracking and texting functions in a wristwatch-like device.
But even in this relatively compact form it seems unnecessarily cumbersome, especially if it's worn separately from a conventional watch. And the messaging feature needs to work with a cell phone anyway, so that's yet another thing that needs to be carried. With GPS technology being built into more devices all the time, it would seem to make more sense to wait for a watch or a phone that included it instead of buying yet another gadget to carry.