Watching those "rescue" films, I'm amazed at the "hover" of the Sea-Kings even in obviously gusty conditions. They look just as stable as kestrels, and even though they are massive it seems remarkable that pilots have the reflexes to achieve this. I'd always assumed they have some sort of inertial control system. I asked a Sea-King pilot about this at a county show about 20 years ago and he claimed it was all manual. But perhaps he was winding me up.