Well you're either making it up or you misinterpreted a very much tongue in cheek comment.
My apologies for sharing an experiance with the AHII community, and my apologies for just LOVING to be cooped up in my room all day thinking of "made up stories" I can tell, so far I'm at about 450ish...
For all I know the GPS in the 737-400 coulda just been about to exploding releasing a catastrophic explosion throughout the hull of the aircraft... but... for some reason I really don't think that woulda happened...
And as you said... a professional crew... who's to say these guys weren't freshly hired? Or that they hadn't flown with maps and charts for so long that they didn't feel comfortable flying with them and running the risk of 'getting lost' (Radar/ATC should take care of that problem shouldn't it?)... I don't know the full extent of it, I know what was relayed to me, which, wasn't much...