GPS altitude again is close to actual

Neil Gould writes:

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.

There are no GPS aviation receivers that are not equipped with WAAS?
Are you sure? The GNS430 and GNS530 manuals I have in front of me say
nothing about WAAS, which would be quite an omission if they supported
it. And assuming that a GPS receiver supports WAAS when it does not
is very dangerous. (So is overestimating WAAS, but that's a separate
issue.)

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