No axe to grind at all people, but since this very sad incident & after all the various arguments, who was right / wrong etc, I still can't quite understand, why, if the Crew had done a INS V flight plan check prior to departure & compared the loaded INS waypoints against their flight plan, the anomaly was not picked up.
There would have been no discrepancy, the flight plan would have had the latest waypoints and these no doubt matched the INS.
There was a briefing a few days prior to the flight where the crew were told the flight path was along a route well to one side of Mt Erebus. It was from this briefing that Jim Collins plotted the course he expected to take on the fateful flight. The waypoint coordinates were changed only the night before the flight.