New set of options (Options|Gameplay window), called Naval Boxes Handling, which can allow you to play a simplified blockade game with less micro-managing. The standard (and default option) don't change anything. The others options will let the ships stay at sea indefinitively unless damaged by the opponent, but they will have a reduced effectivness while in the naval box (abstracted way to show the need to go to an harbor for resupplying purpose).
Is there a consensus on how well this works out, and which of the several options is the most realistic? Does 75%, 66%, or 50% seem best to replicate the standard level of attrition and gain?
In fact, what all exactly do these percentages modify?