Do I need DME or ADF in an IFR-certified GPS panel?

No Spam wrote:

I think the 430/530/480 incorporate VOR/ILS, so the loss of the GPS
constellation shouldn't leave one "lost", should it? I realize I'd be
limited to enroute/terminal operations that only require VOR/ILS should the
GPS system take a hike.

Here's another thought about keeping your ADF.

There are a considerable number of GPS approaches that are overlays of NDB
approaches. Normally, you would use the improved percision of the GPS and
fly it that way. Now the 430/530 requires that your database be current
in order to legally fly an approach (at least with the AFMS that I have).
Now say you are out of town when your database expires and you need to do
such an approach. With the ADF you could legally do the approach and
"monitor" it with the GPS. No ADF and you would need to choose some other
approach in order to stay legal.


--
Frank Stutzman
Bonanza N494B "Hula Girl"
Hood River, OR