IO540 - oh no dont do that, dont take the bait. I have already got that sinking feeling.
Here is the question though. EGKA - you have to land, some "unexpected" emergency, the base is 400 feet - below minima and for same unexplained reason you can use either the GPS or NDB / DME but not both. Which one would you prefer?
Dont know if you read Flying - there was a good article on the paperless cockpit and the circumstances in which the writer held the view the FAA would be happy if "you left the paper maps at home". I cant remember if it was just his view or he had got an official pronouncement from the FAA. I wil try and dig out the article.