Battle of yamato is a map where it is only sea battles. 6 big ships on each side, with 2 carriers on each side. The USA has B-17 planes on 1 carrier and fighter planes on the other carrier but the Japan has more fighter plane and torpedo plane on the other carrier, where the t planes are there is artilery on the carrier for protection.

This map is the best for internet with 30+ people or on LAN.
You get to Experience the real war with lots of ships and planes.