There are a lot of old fisherman tales about how dolphins have helped those lost a sea, find a way home.
They're romantic seafaring tales, but I never thought they were much beyond a feel good story.
Now there's a story out of the Pacific, where a man went on a fishing trip with his brother-in-law, and was adrift for 106 days. He doesn't credit a dolphin with the save, rather a SHARK! He says the shark was guiding him to a fishing ship.
Having a natural fear of sharks, I'm more likely to think the shark was guiding him to a better location to EAT him.