No Spam wrote:
Looking for thoughts out there...

If I have an IFR-certified GPS (terminal, not just enroute), is there any
reason to keep a DME or ADF in the panel? (Other than being able to listen
to am radio or tracking "non-offical" navaids - e.g., am radio stations!)

I just installed a GNS480/MX20/SL30 combo. I kept my old DME for no
particularly good reason other than it was a fairly recent King one
and I had the panel space. It means if my 480 crumps I can still
fly a ILS/DME approach into Dulles.

As for non-official navaids, you can drop an GPS waypoint anywhere
in the world and the 480 will drive the autopilot right to it.

As for ball games, my MX20 receives XM Radio as a side effect of
getting the weather downloads.