A Horror Film Query
 

I remember watching a horror film in the 1980's, set on a boat, where a young girl and a possessed doll are on board and the adults start dying in mysterious ways. I'm not sure if it was a film from the late 1970s or 1980s. It may have been set in the Bermuda Triangle, but I'm not certain of that.

I remember one of the male characters dives underwater to see what the problem with the propellor was and gets chopped up by the propellor when it suddenly starts up.

Also, birds start attacking the boat and the girl fends them off with the doll, she waves the doll about to stop the birds attacking her and there's a closeup of the doll with blood and feathers on its face.

Does anybody know the name of this film?

The Bermuda Triangle (1978)
 

I think the movie you're talking about is The Bermuda Triangle? http://www.imdb.com/title/tt0078417/