After collecting a set amount of resources from a destination, it will be upgraded automatically. The next level of a destination yields more resources per cargo (bonus), but it will also cost you more sailors and sometimes even increases the travel time to that destination. Upgrading a destination gives you a one-time XP reward.
Each destination has a maximum level. Once you reach that level, the material required to level up will change to "unlimited".
If you choose a ship with smaller crew than is required for a certain destination, it will not be shown on the map as possible destination for that ship.
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