Setting altimeters with no radio

"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.