GPS altitude again is close to actual

Recently, Ron Lee posted:

"Neil Gould" wrote:

Recently, Mxsmanic posted:

WAAS isn't part of GPS.

That comment may be helpful in a GPS newsgroup where the technology
is discussed in the absence of any application, however, in an
aviation newsgroup, discussions of GPS are primarily about the
application, and in that context WAAS is inseparable from GPS; in
other words, in aviation there is no application for WAAS
independent GPS AFAIK. So, your above claim is extremely off-topic,
at best.


Actually he is correct. WAAS is not part of GPS. You don't need WAAS
to use GPS for aviation.

No one said that one needs WAAS to use GPS for aviation. Obviously, there
are non-WAAS-enabled GPS receivers. However, do you know of some use of
WAAS in aviation that _doesn't_ involve GPS? I don't. If there isn't one,
then any discussion of WAAS in aviation necessarily includes GPS, and any
attempt to exclude it as "not part of GPS" is nonsense.

Neil