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Reply to "GPS as a measuring device"

Rick, it's that Southern gentleman in you that keeps you from doing what we'd do here up North - tell them to get a life.

Seriously, I've been doing some testing of the Garmin Forerunner for Running Times, and I find it's fairly accurate, but not totally so.

First, it gets thrown off by trees, wires, tall buildings, which cause it to lose a good signal from the GPS satellites. And even when it doesn't the manufacturer only states it is 99 per cent accurate. I ran a certified 3.05 mile course by the beach, and it came up with 3.10,

You could tell the people 2 things: 1. The system is only 99 per cent accurate, and less so if there's interference.
2. They probably are not running the SPR.

These 2 factors would combine to produce the "overage" you describe.
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