>The one place on this earth I *have* had bona-fide
>problems with GPS propagation was down in the hills of
>Tennesee - driving on one of the Interstates that runs
>deep down into some of those 'hills'. The old '94
>Magellean wasn't too keen on providing coordinates
>all the time ...

I have heard of folk going out in the hills and believing their GPS when
down deep in a valley, but the position being reported was incorrect,
because the valley happened to be in line with the flight path of one
satellite, and only one other satellite was visible to the receiver, or
something like that.

I don't remember the exact details of the problem, just that deep valleys
(including those between tall central city buildings) can be a problem which
one needs to be aware of.

The problem that arises when modern man gets dependant on technology,
without realising the limitations of it. :))

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