it seems, that along with the recorded GPS speed, a Garmin fit or tcx file includes also the footpod data (http://fellrnr.com/wiki/Garmin_Foot_Pod_Calibration) Could we get access to this data? I'm just trying to analyze foot pod speed. First impression is, it is rather good and much smoother than GPS speed. Though I don't know, how the footpod knows (or guesses) the stride length, it really reports good speed for different stride rates and running speeds.