"Ron Lee" wrote in message
...
It may depend on the meaning of "precision." If you assume any
approach with vertical guidance then WAAS does. If you mean CAT I or
better that depends on where WAAS is/gets to performance wise. It was
supposed to provide CAT I but has had problems.

As Bob says, the word "precision" simply implies vertical guidance.

As for whether one can actually get Cat I minima with WAAS, I'm taking the
FAA's word for it. I didn't bother to look for any GPS LPV approaches
specifically to see that they actually exist. I just know that the FAA web
site says (via press release) that as of Oct 2004, they were starting to
roll out Cat I-equivalent GPS approaches.