Spehro Pefhany wrote:
> I guess one could interpret GPS data to get some estimate of power &
> work, but it would be highly dependent on the accuracy of drag vs.
> velocity
> and mass estimates. Still, it could be essentially free if you have
> the GPS already.

I don't think that would work very well, at least for normal affordable GPS
units.  The reported position can jump around quite a bit, especially when
you're moving.  Most GPS units have something like a 10 meter 50% error
radius.  The error is non-accumulating for position, but all that noise
shows up as accellerations.  If you low pass filter it heavily, you loose
the correlation of the force applied with when the bike was actually moving=
..


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