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Originally Posted by flopshot
Yes, but that is relative to the satellite at any given point. If you are off by 9ft from where you truly are "here", then you are also off by 9ft from where you are truly are 500 miles away. It's not like you get a 9ft deviation at every point of your journey. So at the extreme, the GPS odometer would be off by 18ft (you are the furthest away from true location at both ends of your journey) which is statistically inconsequential after 500 miles.
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Not really flop, i use a DeLorme GPS with my laptop, and I have always, and I mean always gotten a 100% accurate reading on the speed, yes the location may be deviated, but the relative speed is not, since speed is constant over time. I have actually found it to match within .2 miles per hour of my Digital display on another vehicle.