Stefan wrote:

Actually, it can. It's accurate within a few meters (depending on how
"enhanced" it is), but only in some 95% or so of the time and in some
90% or so places (the correct numbers don't matter). Which means that if
you happen to be in the wrong place at the wrong time, believing in the
GPS can actually kill you, at least theoretically.

Stefan

Actually the 95% number often associated with an accuracy is a
confidence. It is not an availability value. Thus under the
identical conditions 95 times out of a hundred you would be at that
accuracy or better. No value of the other 5% is given and may not be
very much worse. At least in this case not enough to be
life-threatening. Of course if VFR use your eyes and look outside.

Ron Lee