Why End on a Boat?

I'm not too sure why the movie would end on a boat. When someone is out in the middle of the ocean in a boat, there is nobody around, just you and the ocean. You look off in the distance and all you see is water with no visible land. For the life of me though, I can't figure out why the movie would end on a boat. I guess since Rosencrantz and Guildenstern were of little importance and were nobodies, it would make sense for them to die on a boat in the ocean, because when you're on a boat in the ocean, you're basically a nobody. You're just a small boat in a vast expanse of water, subject to the ocean and mother nature. Does that make any sense whatsoever? Basically, since R & G are nobodies, it makes sense for them to die on a boat where they're nobodies.