>To do this properly you need to do it on a per satellite
>basis.  You can't just take the error from one position
>and use it as an offset for another receiver as you can't
>be sure they are both using exactly the same satellites
>to get their positions.

I can see where you're coming from with this, but I understood the trick was
you used the data stream from a receiver that is at an accurately known
point, and compared your data stream with that data stream. Hence any data
from satellites that the reference receiver can see, and my receiver cannot
see, and vice versa, get excluded from the equation.

I do not know how many satellites each receiver has to have in common, but
the I understood the technique is good for relatively small distances anyway
(10's of miles). I may have this all wrong though, so please correct me.

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