On Sun, 18 Jul 2010 12:19:23 -0800, Bruce in alaska
wrote:

Not to dis Wayne, but MANY Governments that are NOT Allies with the USA,
have purchased GPS Jamming Technology, from the Russians,

It was never my point that GPS could not be jammed. My point was,
and is, that such jamming would by necessity be relatively short range
because of the microwave frequencies involved. The only exception
would be some sort of systemic jamming that originated within the
satellites themselves. It's my understanding that jamming of that
sort would affect all users.