Ahhh, the sweet sound of cannon fire. You can’t take a knife to a cannon fight. They are the key to keeping yourself from becoming shark bait. Ships can be equipped with multiple cannons, from 3 cannons and up to 6. When equipped, they increase the cannon damage. Cannons are also upgradable to level 9 through CPR tokens. The higher the level - the more firepower you have.After 3 sea battles, the cannons will need to be resupplied in the harbor. It will take some time for this to complete, but you can be on your way right away with a little bit of CPR tokens.