ChampionChips were used to track runners at this year’s Mumbai Marathon in India. The ChampionChip uses RFID chip that doesn't need internal power supply.
A chip was given to each runner a day before the marathon during registration. The ChampionChip made things so easy that participants at the Mumbai Marathon got their certificates within minutes after the race ended.
ChampionChip has been used in many international sporting events like the London Marathon, Berlin Marathon etc.
Via [RFID Blog]
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