Originally Posted by
Chris2303
I'm certain that he never said that there was a change in "Navagation" coordinates
So what did it matter? In the previous hour not once did the crew look at a chart and check where they were. The INS held maybe 6 coordinates in it and if they had looked even once at them they would have seen that there was no left turn to overhead Scott Base after passing over Erebus. Who goes flying and never looks on the chart once to see where they are? Chippendale was correct in that the crew threw the SOP and airmanship out the window. Unbelievable they got no Tacan lock to check INS drift and confirm position and descended anyway.