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From Fellrnr.com, Running tips
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I expected GPS watches to improve with time, but the opposite appears to be happening. With the Garmin devices especially, you can see that the older watches generally do far better than the newer ones. I suspect this is due to compromises to get better battery life and smaller packaging and the cost of GPS accuracy.
==Smartphone Accuracy==
==Interpretation and Conclusions==
What do these statistics mean? This is my interpretation: