In Rattle, Battle, Grab the Loot we have two categories of devices that can be added to your Galleon: Parts, and Upgrades. Parts are the basic items: Sails, Cannons, and Holds. These are the main objects that give you the ability to move, fire, and store goods. They are the base layer of your strategy.
They are also referenced in many ways:
When something refers to a Cannon, it specifically means the Cannon Part. There are no Upgrades that count as cannons.
When there is a reference to a Sail, again, this means only the Part. There are no Upgrades that provide Sails.
What does this mean for you? Well, it’s simple. That Big Bertha, or Super Cannons sure does look like a Cannon, doesn’t it? Well, it’s not. It’s an Upgrade. When you want to fire with your Big Bertha, you still need to have a Cannon ready for the Fire action.
This works the same with Super Sail and Drill. They are upgrades to the Sail action and you must have a ready Sail to make this work.
There are, of course, a few exceptions to this rule. Boarding Hook, Parrot, and Turbine provide you with additional movement options. These do not require you to have a ready Sail. They work on their own.