I see that my reference should have been AIM 1-1-19(a)(8). Other than that,
the guidance remains the same.

I note the phrase "will be" sprinkled through the discussion of WAAS. Has
WAAS been approved for operational use? How many boxes have the
functionality described in 1-1-20?...I think the CX-80 does.

Bob Gardner

"C J Campbell" wrote in message
...

"Bob Gardner" wrote in message
...
Can't address your problem, but AIM 1-1-20(a)(8) tells us not to use GPS
altitudes. Doesn't say anything about WAAS...yet.

1-1-20's title is "Wide Area Augmentation System (WAAS)." There is no
1-1-20(a)(8). 1-1-20(b) gives guidance and procedures for flying
approaches
with vertical guidance from WAAS and says that some installations of WAAS
may be certified for precision approaches as having greater accuracy than
barometric altimeters.