"C J Campbell" writes:

with advanced aircraft systems. Perhaps the task should be automated -- dial
in a localizer or ILS, and the CDI automatically switches to NAV. However, I
can envision problems with this approach as well, so to speak. :-)

The Garmin units do this if you select an ILS approach (which puts the
localizer frequency into the standby) and remember to flip the
frequency to active. You get GPS guidance through the procedure until
you're inbound and intercepting the final approach course.

Of course, then you have to remember to put it back into GPS mode if
you want missed approach guidance.

I believe this is configurable.