GR4 too...
 

Similar thing happened when the GR4 went south for the first time to play in Ex Pitch Black. The map turned upside down and then tracked from right to left. Very confusing.

I seem to remember that there was some bizarre fix like selecting the FLIR off and on 3 times or something. Don't think it included cycling the TACAN...

shipboard alignment
 

I thought the Buc had some sort of INS. If that was indeed the case, then shipboard INS alignment is over 40 yrs old.

Buccaneer with INS??

Oh dear me, no. Just a GPI and the skill of the rear-seater!