"kevmor" wrote in message
ups.com...
Also, what is the difference between approaches such as:

RNAV (GPS) Y RWY 20
RNAV (GPS) Z RWY 20

Sometimes they look identical I've noticed, is the Y and Z designation
similar to the A in VOR-A, etc?

On Apr 17, 1:59 pm, kevmor wrote:
I'm learning to use the KLN94 IFR GPS and was wondering about using
the ALT button to set the current altimeter setting. I can see why it
would use this for VNAV, but is it required to set it for normal non-
precision approaches? I think the only thing I've read in the manual
so far was it helps to get the RAIM check done faster or something
like that.




From the AIM, 5-4-5(a)(3):

(d) The naming of multiple approaches of the same type to the same runway is
also changing. Multiple approaches with the same guidance will be annotated
with an alphabetical suffix beginning at the end of the alphabet and working
backwards for subsequent procedures (e.g., ILS Z RWY 28, ILS Y RWY 28,
etc.). The existing annotations such as ILS 2 RWY 28 or Silver ILS RWY 28
will be phased out and replaced with the new designation. The Cat II and Cat
III designations are used to differentiate between multiple ILSs to the same
runway unless there are multiples of the same type.

Bob Gardner