Marathons use RFID, keep racers connected to fans

Marathons use RFID, keep racers connected to fans
April 8, 2007

CNN.com: Runners in marathons around the country are being provided with RFID chips that attach to shoelaces. As they cross large rubber mats along the course, a radio transmitter inside the chip sends a unique ID number to an antenna, which routes the runner's progress to a central database. The information is then sent to a cell phone or e-mail address on file. Elapsed time: between two and four seconds.