The coastguard didn't let its helicopter pilots fly lead out of sitka until they practised difficult landings at spec locations. Visibility in alaska was frequently poor and conditions changed quickly. One pilot told me about blindly tunnelling through fog in the dark when his co pilot got caged. The man lifted his eyes momentarily from his instruments, and without any visual references or a horizon to latch on to, found it impossible to reorient himself. He lost all sense of direction and was felled by vertigo.

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