Thanks for the link, I HAVE heard of that problem, but, correct me if I'm
wrong, that error can be corrected manually since you know WHERE you are,
and unless you are travelling thousands of kilometers the error doesn't
change much. TTYL

> >From within: http://www.allgps.com/gps/chapter2n3.htm
>
>
> Mathematical [GPS] models
>
> This might be a good place to introduce a common engineering
> practice ... .
> In the last section, we mentioned the use of mathematical models
> to correct
> the effects of the atmosphere on GPS receivers. Many times, engineers use
> mathematical models to solve problems.
>
> One example of this is the use of empirical formulae.

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