I just pulled this off Timex's website for their GPS product:
"Distance accuracy is typically better than 95% in most environments and up to 99% in environments with a clear view of the sky."
To put it into context, if you were actually running an 8:00 mile, 95% accuracy means that the unit would record you as running between 7:36 (-5%) and 8:24 (+5%).
I like these kinds of products, but I know this much: If I'm running an 8:00 mile, I don't need a device telling me I'm running anywhere from 7:36 to 8:24 - my own biofeedback is more accurate than that by a longshot.
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