Cargo points are calculated based on the level of each ship in your castle. Each level of a ship contributes a specific number of cargo points:

• A Level 1 ship gives you 50 cargo points.
• A Level 2 ship gives you 100 cargo points (50 points from Level 1 + 50 additional points for Level 2)

If you add up all the points from the ships currently in your castle, that is how many cargo points they are giving you, we hope that this clarifies any confusion.