From the introduction: When a person(s) wishes to use a boat or some other aquatic based object/creature in water, the sailor roll a skill roll using the Craft: Sailor and Navigation skills. The first skill roll is made with the navigation skill. This skill roll determines where the ship will go and the stops the boat must make to re-supply. The second roll is made with Craft: Sailor skill. This skill roll determines how well the crew maintains the ship. These rolls must be made daily.