I'm not 100% sure that the chip you are given when you register for the London Marathon is an RFID chip, but once attached to your shoe the chip ensures that each runner's race time is recorded.
It marks the point from when you cross the start line to the finish line and ensures accuracy of time recording and that everyone who finishes can get an official time.
I've just attached mine - see pictures below - as part of my final preparations for the London Marathon tomorrow morning. It's a bit fiddly, but I think its a great use of technology.
I'm a bit nervous and keen to get going now, so having eaten my final bowl of pasta - I'll be chilling out in front of the telly for an hour or so, before getting an early night and hopefully a good night's sleep.
If you want to donate to my charity for running the Marathon please see my Justgiving page
