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mort,
I have had this site up for about 2 months, and I haven't had anyone comment on the idea of using the GPS running watch to record your speed so you can calculate your Cd and Crr. I was wondering when someone might notice it is a cool idea. Since many phones now have a GPS built in, I figured they could do it too. Some running sites have a way for people to track their runs with their phones so I think it can be done. Did you check out the article on measureing your energy use for your route? I had used the running watch to record the distance to work so I could calibrate my odometer. Then I realized that it had all the information to calculated your energy use from speed, acceleration, and altitude change. (the altitude change is not very accurate in GPSs , so be careful.)
Frank electricmgmidget.com (a few more posts, and I can add this to my signiture)
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