Dave S wrote:
Mort.. welcome back into the air.

First off.. I am assuming that the Garmin 430 or other GPS is certified
for use in approaches IN YOUR INSTALLATION.. that usually means a couple
of specifics when installed and configured, and also a current database.
When you power the box up it will indicate if you are able to use it for
VFR navigation only. In the case of the 430, I cant rightfully think of
why someone would by a $10,000 box and not have it installed to its
fullest capability..

anyways.. You can use an IFR certified GPS LEGALLY to substitute for an
ADF or DME if the navaid's physical location is in the supplied database
(user made waypoints dont meet this requirement). So as long as you have
an IFR GPS, with current database, it would substitute where an
approach has "ADF" or "DME" required on the plate. I am not referring to
NDB approaches, but keep in mind that in many many instances, NDB and
other approach paths have "overlay" approaches that are GPS procedures..
so chances are if there is an NDB approach into someplace, there is
likely also a GPS/RNAV approach into there as well. My information is a
little dated here, so if there is a more correct version, someone will
surely update this thread.

Most of my GPS use has been with king products with minimal time behind
the Garmin.. did safety pilot a few times with a guy using dual 430's..
Pretty much in your scenario, with the ILS approach, with an ADF for the
IAF.. one possible way to tackle this is to have the Direct To set to
the ADF location/identifier. Then set the Nav to the ILS frequency, set
the panel CDI to indicate NAV instead of GPS.. and fly the needles..

The needles will give you your ILS info.. the GPS in the stack will give
you distance and bearing to the IAF (NDB).. and the moving map will show
you a pretty purple line going to your IAF. I do not recall if the 430
has ILS approaches "overlaid" in its database for GPS situational
awareness. If this is the case, selecting the ILS approach on the GPS
flight plan would provide GPS guidance that would automatically sequence
you past the ADF in question.. and probably cut the workload. You'd
still fly the ILS needles in either case, regardless of how you dial the
GPS in.

There is lots of good reading on AOPA's website that is archived over
the years on issues like this.. Find you an instructor who is savvy with
the new boxes and go play for a bit.. or find a pilot who is really
savvy and have him be your safety pilot and again.. go play..

There is also a free software download you can get from Garmin
(www.garmin.com) that is a "trainer" for their 400/500 product line that
can get you more familiar with it. The manuals are also available for
download for free if I remember correctly. Do some homework now and save
some money later.

Its a brave new world out there, Mort..
Dave (RN too)

Mortimer Schnerd, RN wrote:

I actually posted this in another aviation newsgroup in which I
actively post all the time but didn't get a reply... I assume because
of the crash in Manhattan got everybody's attention. That being said,
I'm still hoping for some insight from the more recently trained.


==== cut begins ====
I'm still a little confused how I'm expected to legally fly an ILS
approach that
uses a NDB as its IAF with a GPS on board instead of an ADF. (For
example, the
ILS Runway 2 approach into KUZA (Rock Hill, SC)). The rental aircraft
I have
access to these days all come with GPS, which is very nice, but I
still want my
ADF for the little airports I sometimes fly into.

Feel free to educate me... I was out of flying for 15 years and the
technology
passed me by. The last time I was flying regularly LORAN was just
coming to
aircraft, and everybody was flying ILS, NDB, and VOR approaches. I
took an IPC
to get my instrument currency up to date but we used the older
equipment with
which I was already familiar. I'm comfortable enough setting up a
Garmin 430 to
navigate to another airport but that's about the limits of what I can
do with
one. Don't have a clue about GPS approaches....



Be careful with the DIRECT TO command. I have KLN 89/B and it will not
enter the approach mode from Direct to. You must be on a flight plan
(e.g., from some point TO some point). Then you can select the approach.
Like Dave said, many NDB approaches have a GPS overlay. But what is
really nice is the GPS only "T" approaches. Very easy and no reversal turn.

--

Regards, Ross
C-172F 180HP
KSWI