Ron Natalie wrote:
Kevin Clarke wrote:
Is there any value to WAAS yet, beyond the "Gee Whiz" factor? Can I do
precision approaches with it yet?

Gives you a couple of features:

1. There are LPV approaches which have vertical guidance and DH's
a bit higher than ILS's (I think the lowest I've seen is 300').

2. Removes the condition to pick an alternate that has a non-GPS
approach you are equipped to fly.

3. The TSO mandates some nice features such as the autosequencing
of the course reversal and missed approach that the 430/530 was
previously missing.

It also gives you an advisory glideslope on non-precision approaches, so
it makes the mechanics the same for all approaches, just like an ILS.
Gives you a constant rate descent to the MAP with no level-offs,
guaranteed to be at or above all the step-down altitudes. At least the
GNS480 does this, not sure it's specified in the TSO or not.