The campaign will be based on the semi-historical Caribbean c. 1700, as described in the Green Ronin Publishing sourcebook
Skull and Bones. Although it is not necessary for all players to own a copy of the book, I suggest that those who want to be more informed about the world we will be playing in pick up a copy. It can be ordered as a downloadable .pdf for $14 from Drive Thru RPG here:
http://rpg.drivethrustuff.com/product_info.php?products_id=19330&it=1&filters=940_0_0_0_0. Drive Thru RPG is a reputable company that I have used on quite a few occasions to good result. They are also endorsed by ENWorld and have been for several years.