Recently, Ron Lee posted:

"Neil Gould" wrote:


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

No, it would be incorrect.

Such a distinction can be made in some context other than aviation, as
I've already written. However, you have yet to name one application --
read "device" -- in use in aviation where WAAS is independent of GPS.
Therefore, the meaning of "a part of" as you are using it is clearly wrong
in this context, and can only mislead. Is that your intention?

Neil