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I have one working flawlessly with an Edge800 but had to find the right way to pair it. You may need to enter the sensor number from the LH crank arm and 'start' a ride before calibrating/pairing. Travelling at the moment and can't find the original InPower text I followed but this is basically the same process:
http://www.velotechservices.co.uk/cli/VSX001/PDF/Checklist_ENG_Online.pdf
does anyone have a rotor inpower and a garmin? im not having much joy getting them calibrated :-(