So cell phones are supposed to be at their most potent as carcinogens when they are searching for a connection or when you use one while moving (in both instances they have to emit more microwave radiation). Well then, would not the same dangers apply to use of all GPS watches [i.e. exposure to radiation on a day to day basis due to their use while one is in motion]. Might be time to go back to running by feel and/or an old-timey stopwatch.