I'm going to tell you what is in the ocean:
x- whenever there is an x that's where you can find tresure ( most of the treasures are useally ship parts )
Girl- The girl moving in the sea, her name is Lineback and try not to go near her, because if you do she will attack! You defet her by trying to get to her back and attack it!
Ship- Whenever there's a ship it will useally be a guy that will test your sword fighting skills
Guy- It will be a guy in another ship that will maybe be selling some stuff
Fish- Whenever you see a fish on the map go there, you will see nothing, that's because you have to fish to find it!