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The fact that Timex's GPS product displays speed to one-tenth of a mile-per-hour does not mean it is accurate - for example, it might flatter us all by saying we are running 12.3 mph (4:53/mile) - but that hardly means we are running that fast.
It is notable that Timex makes no claim for accuracy. By contrast, the Nike product is identified as being at least 97% accurate - my personal experience with the Nike product is that it exceeds 99% accuracy when it has been recently calibrated.
If anyone has any actual experience measuring the Timex product's accuracy, I'd love to read about it. The closest I've some is a posting from a sports retailer on a UK based bulletin board indicating that the Timex product can exceed the accuracy of the Nike product under ideal conditions, but that obstructions between the GPS receiver and the GPS satellites (trees, bridges, buildings etc.) will result in a loss of the GPS signal - this must surely effect overall product accuracy under non-ideal conditions.
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