dalek
Nothing was wrong with the crew accepting the planning of an RN Officer ---
AS LONG AS THEY ASCERTAINED EXACTLY WHAT WAS PLANNED.
Did the crew, as well as the investigating Board, ASSUME that the turning point was the Lighthouse; whereas the co-ordinates entered in the SuperTans were for the Helicopter Landing Site? If, as suggested, the planning was done by Lt K; it would have been perfectly reasonable for that Officer to choose the HLS as a planned turning point as it was used by Detatchment Crews and it would have been an opportunity to view the site before being tasked into that site.
The old Flight Safety adage:
DON'T ASSUME -CHECK