A previous thread about CV groups pulling right up to shore got me thinking. If this were the real world these ships probably wouldn't be able to get that close to most shore lines. Could there be a way for terrain builders to specify depth to the water? Specify the minimum safe depth for the fleet to operate in and then show, on the CV commanders map only (maybe), the depth of the water. They would be able to chart a course anywhere in the water but if they aren't careful the fleet or, just a ship or two, would run aground and become disabled.
Maybe this is too complicated but, it seems better for realism and to eliminate people using the fleets as pseud-landing craft.