Brian Abraham,
"Not according to Captain Simpson, who said the simulator was never placed in a position 50 miles north as claimed by Captain Johnson."
That is why the Company memorandaum to Antarctic crews OAA:14/13/28 dated 8 Nov 1979, Headed McMurdo NDB NOT AVAILABLE.
" it was succinct and unambiguous." is important, and it is known the crew knew of these requirements. It is a fact, not who said what and who said he did not.
"What advantages accrue from specifying the VMC descent to be made in the stipulated sector overhead McMurdo?"
To ensure what happened could not happen, to avoid Mt Erebus.