Piney, when you run at a speed much faster than you calibrated at, you get ripped off on distance. I have written to Nike and said that a good feature would be to allow for multiple calibrations (ie a tempo run calibration, a recovery calibration etc...). Their solution is to buy multiple sensors. No thanks.
When you know you are going to be racing you can hit a track the night before and calibrate a 400m at your race pace and it'll give you a decent reading in your race. But if you try to use your training calibration in a race you always get hosed.
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