Well, I have known it has been off for a while, I just haven't done anything about it.
I know that it is about a tenth of a mile off or so. There is a run from my house that is 2 miles to a bridge and when I get out there it usually reads around 1.85. I think it is more of a function of having moved the sensor to different shoes and they may not be laying where they used to in relation to my foot.
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