Caribbean Pirates Puzzle

Somewhere in the Caribbean sea at 2nd July 1816... In a dark and stormy night Captain Sparrow the most overrated pirate in the Caribbean and his mob of bloodthirsty pirates pounded the frigate Meduse. Finally after a long and hard fight, they boarded the Ship. Just very few of the crew survived the strike. But on board there were no wealth at all. Just a little treasure-map was found in one of the passengers possession. Unfortunately he was overhasty killed by the big fat and stupid pirate Blood-Svente before somebody could find out any details about the map. Ultimately the frigate with the re...