> Ummm... I don't want to get into a pissing match here, but all GPS units
> triangulate; see Tully's original post about $200 units that track 10 or
> more satellites. And since the signals of all the satellites are distorted,
> more triangulation doesn't translate into better accuracy on the ground.
> More expensive units are more accurate, but the military induced fuzz is
> the same for all (i.e. about 100m).
>

I know nothing about GPS units myself, but I seem to recall an article
in Scientific American a while back about them. The authors was
describing the way that some units could be modified to increase the
accuracy by using more satellites (I believe). The military apparently
didn't like this, but there was nothing they could do about it.

Bob Mauritsen
rhm at ms.washington.edu