Recently, Bob Fry posted:

writes:

Heard about the GPS ?

GPS was covered in some detail in the original 1998 thread. GPS just
isn't accurate or reliable enough for a lot of fast-moving objects in
a crowded space.

But if all GPSs are consistent in their error, then their relative
accuracy w.r.t. each other will serve.

Oh? How about relative accuracy w/r/t buildings, houses, and other
obstructions?

IMNSHO, this has to be thought through a bit more. We're running out of
deserted spaces to operate this kind of thing.

Neil