"N9NWO" wrote in message
...

"Chuck" wrote in message
. ..
: In A&P school several years ago, we were told that GPS was not certified
for
: use in aircraft, although they do make a good *aid*.
:
: Has the FAA changed it's stance on the use of GPS? Has GPS become
certified
: to use in navigation in aircraft?
:
:
: Thanks...
:
: Chuck

I believe, if the unit is certified, that it is good for at least Cat I.

Well...if the unit is certified to SCAT-I (special category I). There has
not been any units in used that is certified to this level. Boeing is
working on one. These are not mere GPS though, they are differential GPS
(with specially designed, dedicated ground station correcting for errors).

WAAS is supposed to take care of the ground station part but so far has not
been good enough for use for CAT-1.