http://www.newsweek.com/assassins-creed-ac-odyssey-ship-upgrade-crafting-guide-ancient-tablets-1155899

Assassin’s Creed Odyssey features the return of Assassin’s Creed IV: Black Flag style naval battles. Where there’s a ship in an Assassin’s Creed game, there’s a way to upgrade it and the ship in Odyssey serves as the only form of crafting in the game.

Get your ship in, well, ship shape with this upgrade guide Ubisoft