Narco DME. Finally, after 50 years, gave up. Display works, but none of the stuff I need. No Distance to wherever, no speed either. The shop that fixed it 10-12 years ago closed when the two owners/electronics experts retired. Is there anyone left who can fix this thing? I repeat - do NOT go the GPS route. I don't have an extra $15K at the moment (or in near future) to do it right.