I noticed that the Nike+ doesn’t adjust well to changing pace, and needs recalibration. If I run at around 11:00/mi pace, it seems to record high. If I run quicker, more like a 9:30/mi pace, it records slower.
I think moving it from the shoe pocket to the shoelaces means that I need to re-run some calibrations. I’ll rerun the walk and run calibrations at the track and see how it goes.