![Green Circle](https://bssef-com.exactdn.com/wp-content/uploads/2017/09/green-circle.png?strip=all&lossy=1&resize=50%2C50&ssl=1)
Athletes’ finish times are recorded using RFID (radio frequency identification) tags or “chips”. Prior to the race, one Chip Manager provides each athlete with a chip, which is attached to the athlete’s left ankle. At the finish, another Chip Manager collects chips.