Paul J Adam noted:
(Did I mention that you can jam GPS? Even military sets? Iraq tried and
failed, the next enemy may do better)

Murphy attacks, things break, power supplies don't..
Try 14+ hours McChord to HI, daylight, nothing worked, even the sextant had a
split bubble, it is too late to get out the book and read. You better have
learned it in training, whatever crew position you hold.

Oxmoron1
MFE
And it was a FREAKING check ride!