Or a U-boat.
Personally, I think there needs to be more ships. The Carrier fleets should remain as is, but there should also be warships flotillas with two cruisers.
Perhaps also model a battleship.
If your looking to really make navy action more interesting, add
1. Cargo fleets...the water equivalent of land convoys/trains.
2. U-boat wolf packs. A "fleet" that allows you to spawn up and down the line as your own U-boat to go forth and sink ships.
3. Battleships
4. Gun directors. Instead of taking control of a turret and firing it directly, take control of the small boxes on top of the superstructure. The turrets slave to those.
5. Target Data Computers. You set in the targets range, bearing, heading, and speed and turn the computer on. The computer then aims for it and tracks it. It is only as accurate as you make the settings though. Both for main guns on warships and torpedos for DDs and Subs.