Remember one sortie, FY-STN-Aberdeen ie right hand down-a-bit all the way.
Reached the Stornoway turn and the stude called for a LEFT turn. Pilot queried it and nav corrected.
Reached the Orkney turn and once again the stude called it wrong - 50-50/Ask a friend didn't exist in those days. Pilot queried it.
Stooging down the North Sea, practice emergency and diversion to Aberdeen declared. Quick as a flash the Nav came up with a new heading and AGAIN called the turn wrong.
This time Captain Cnut did as he was told and turned the long way round. Once established inbound we were fuel priority with insufficient fuel to fly the instrument procedure. Unfortunately I didn't have my nav rule with me!