Fleet Size Upgrade

An upgrade that increases the maximum number of ships that can be placed on the battlefield.

While this upgrade is theoretically limitless, there is a technical limit of 331 ships as the max fleet size.
 * 231 ship tiles in the largest grid area.
 * 100 ships in squadrons. (5 squadrons x 20 ships each)

This upgrade also has a hidden effect of increasing battle and idle income by +33⅓% per level, with a slight negative effect of increasing the ship loss penalty in battles.