Where Am I? GPS Tracking

摘要

Even John Merriam, advocate of chip timing, admits that RFID has its limitations. "I expect a cellphone with GPS will do better at signaling location," he says. Indeed, cellphone apps such as those from MapMyFitness (mapmyfitness. com) use GPS cellphone signals to track and broadcast one's movements. The Runner Tracker company is working to bring affordable GPS tracking to the world's marathons. Runner Tracker is also developing GPS systems to time bike races and to keep track of hikers. The app Glympse works on iOS and Android phones to notify family and friends of the user's location.