Neil Gould writes:

No one said that one needs WAAS to use GPS for aviation.

Perhaps, but some seem to assume that all aviation GPS uses WAAS,
which is not true. And some seem confused concerning the accuracy of
GPS, with or without augmentation by WAAS.

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.

All en-route navigation can be (and often is) conducted without WAAS.
There are many GPS receivers (in aviation and in other applications)
that do not use WAAS.

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