http://sidmeierspirates.wikia.com/wiki/Upgrade
I loved playing Pirates! as a kid and I feel like these upgrades would work really well with this game:
Copper Plating: Moderately increases the ship's turning rate.
Cotton Sails: Moderately increases the ship's overall speed.
Iron Scantlings: Slightly increases the ship's Durability.
Chain-Shot: Enables the ship to fire Chain-Shot during combat. (Damages sails)
Grape-shot: Enables the ship to fire Grape-Shot during combat. (Damage hull)
Fine-Grain Powder: Significantly increases the range of the ship's Cannons (with all ammunition types).
Bronze Cannons: Increases the accuracy of the ship's Cannons (with all ammunition types).
