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Reply to "Testing the Accuracy of a Garmin GPS"

If a GPS is mounted on the wrist, and the runner runs the SPR, the path the GPS takes will be a zigzag as the arm swings around. When you are running your wrist does not follow the same path as your belly-button. It follows a longer path.

So, if the GPS is working perfectly, the path it takes will always be longer than the SPR.

I think this may complicate things when it comes to testing.
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