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of WAAS-based approaches are classified approach with vertical guidance (APV) if
as APV’s because it does not meet the you read it in the sense of IACO terms and
ICAO and FAA precision approach defi- standards. It is flown to a DA as opposed to
nitions which mostly apply to localizer an MDA but it is NOT a WAAS approach.
and glide-slope transmitters. The powers- LNAV/VNAV approaches were avail-
to-be within the two organizations reached able before the WAAS platform was cer-
an agreement that both the FAA and tified. The reason it may seem new to you
IACO would adopt the term “APV.” is that in the past, only aircraft equipped
The development of these WAAS- with Flight management systems and cer- Continued on page 26
based approaches brought us even more
terms to be found on certain instrument
approach charts. You will see “RNAV
(GPS)” on charts today. A common re-
sponse to this is “why not a WAAS only
chart” – here’s why, again it was and is a
money issue. The publishing of RNAV
(GPS) charts allows chart makers to pub-
lish GPS and WAAS-based approaches
on the SAME chart with the differences
in approach types found in the minima
section. This has saved on doubling the
size of our instrument approach books! To
determine what “types” of approaches are
available at a particular airport, i.e. GPS
or WAAS-based approaches, you must
look to the minima section to determine
whether it is a “traditional” GPS or
WAAS-based approach. You will learn
about the various GPS and WAAS-based
approaches below.
Let’s take a look at the “L-phabet” of
GPS and WAAS approaches. Fortunately,
they made it somewhat easy for us be-
cause all of these approaches begin with
an “L.” How thoughtful of them!
GPS & WAAS-Based Approaches
LNAV- This stands for “lateral naviga-
tion” and is the early pioneer if you will,
of basic GPS approaches. These ap-
proaches provide lateral guidance ONLY
and as you may recall, are flown to an
MDA as opposed to a DA. Although these
approaches pre-date the advent of WAAS,
they can be flown with WAAS receivers.
LNAV/VNAV
This stands for “lateral navigation / verti-
cal navigation.” This type of approach is an
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