This upgrade adds a powerful, independently firing cannon to the Monkey Buccaneer.
The cannon allows the Monkey Buccaneer to pop frozen and lead bloons. Note that the cannon fires bombs separately from the main dart. The explosion size is the equivalent to a Bomb Tower with Bigger Bombs.
In BTD6, Cannon Ship returns as the 3rd upgrade of Path 2 for the Monkey Buccaneer. Just like BTD5, it adds an independently shooting cannon that shoots bombs. However, there is no automatic camo detection, since Crow's Nest is now alongside a different path to the Cannon Ship. It costs $900 on Medium.
Ironically, this upgrade gives the effects of Dreadnaught despite not being a premium upgrade. It also has an explosion, making some people believe that this upgrade is actually better than Dreadnought.
The bombs look like 0-0 bomb tower but the explosion looks like 0-1 bomb tower.
The rapid fire upgrade combined with the cannon ship will make the cannon shoot faster.