Once had a co-pilot tell me to fly a hdg. of 310 leaving Singapore for Australia. That's what the INS told him, he said.
Moral ? Don't rely on gadgets !
Not really; the moral is to learn to not be a d*ckhead, especially under IFR (as your flight must have been).
In reality, one obviously should not depart until one has dug out and studied the SID and worked out how it will join to the filed route, etc, so your co-pilot's reciprocal heading error would have ended in a disaster pretty fast (in a mountain perhaps?) and is nothing whatsoever to do with gadgets
With a bit of luck though, your life might have been saved by another useless gadget: GPWS
