Thousands of Survivalists Compete With Help from RFID

With its first of what may become a series of annual endurance races, the Bear Grylls Survival Challenge, in Santa Clarita, Calif., will leverage ultrahigh-frequency (UHF) radio frequency identification technology to track the level of fitness and endurance of each participant during challenges as wide-ranging as racing up stee  hills, eluding mines and eating mystery proteins. Traditional races, such as triathlons or marathons, track an individual's speed based on the time that he or she begins the race and when that person crosses the finish line. The Survival Challenge, however, is not just about speed, but also how well competitors perform in a variety of challenges, some in very remote locations