On Wed, Nov 11, 2009 at 4:41 PM, Glenn L. Austin <gl...@austin-soft.com> wrote:
> Consumer-grade GPS is still limited to 30 meters (stationary) or 10 meters 
> (in-motion).
>
> The reason for the better accuracy for in-motion has (basically) to do with 
> doppler effect.

Well DGPS or WAAS can improve beyond 30 meters but the iPhone doesn't
contain such a receiver to the best of my knowledge.

-Shawn
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