A new book entry has been added:
Modern Naval Strategy for Beyond the Sword
Beyond the Sword changed many things about the game, and naval warfare was one of the most dramatically affected. The limits on aircraft units per city changed the scope, but not the basis of air warfare. The additional units in land warfare made siege units relevant again.
But war at sea was completely changed.
In the vanilla CIV4, naval supremacy was nice to have but not necessary. The worst that could happen from not owning the oceans was losing some fishing boats and an air strike here and there (which you could counter with land-based aircraft). After your massed stealth bombers whittle them down, a few battleships can take down entire fleets of weakened enemy ships.
Cruise missiles and tactical nukes changed all that.