Hey, the automatics never fail...right?
Not too long ago, on a "modern" aircraft, we experienced
dual failure -- right in the midst of a rather complicated STAR into a very busy airport.
(No, the failure wasn't self-induced or operator error
)
Thankfully, because we were both still proficient at raw-data flying, had a decent scan, etc., the lack of our normal features didn't cause us any real problems at all, although it was a bit "busier" of course. But it just goes to show you -- you
must find ways to stay proficient with raw data, because you never know when your automatics might choose to fail.