Played a bit more today, was determined to figure out how the game actually worked. So there are two treasure map sellers (basically quests) in the starting towns, they will sell you maps for increasing costs but the first one is just 0g and nets you 30g in return. You have to "buy" the map for 0g, then go back to your ship and in the room with the giant map behind it is a smaller table where you can activate a quest/map. Your crew has to vote to make that your active quest, even if its a crew of 1. Then you have to use right bumper (dunno PC) to select and view the map, press right trigger to zoom in on the map and look at the text or location. Then go back to your main map in the cabin and find the island with the treasure, and then go sail to it, find the spot, fight off a bunch of skeletons, and reclaim the loot. Now you gotta haul the loot BACK to the map giver, so hope you remembered where the fuck you were and how to go back. If its a chest you have to haul it back to your ship, drop it (B), sail back, pick it up, and run it over like UPS.
All in all I found the whole experience extremely tedious and boring, I hope there is more to the game because its the most simplest and boringest 2004 style MMO fedex quests otherwise.