Gene Whitt wrote:

Y'All,
The following is just a small sample of a mix of need to know, nice to know
and what to know. The fact that there is also a diagram in the book makes
it more understandable. I believe that the .3 RNP level and lower can only
be reached with WAAS or LAAS still in the works.

That is incorrect. Today's RNAV IAPs are considered RNP 0.3 procedures but they
don't use linear containment areas.

Draft criteria for linear RNP containment area procedures to values as low as
0.10 and optionally using RF/TF legs has been completed by the FAA/Industry PARC
(performance-based advanced procedures group) and is awaiting signature from the
head shed.

WAAS will be required on these procedures only if an LPV glide path is to be
designed into the procedure. With BARO VNAV, no WAAS requirement.