I have a few ships in the game now. There are Aegis Cruisers, Transports, Custom Sailboats, Voyagers and the Zombies have the Evil Transports.
The Cruise Mines are still in the game and I added Many Devil's Reefs around Paradise Island.
Between the Cruise Mines, Aegis Cruisers and the Voyagers, there is Plenty of Power... OverKill actually but it is Needed to kill the Powerful Zombies and the numbers of them in Jungle Island and Adventure Island
...the Voyagers also transport 5 Units.
There is not really any problem for the Human Factions getting to those other Islands because each Human Faction has units that can get to them without ships.
The TARDIS is one powerful Unit and transports 3 units with Blitz and Rebase ability.
There are Paratroopers for use and other units such as the Farmers "Old Buzzard" = Crop Duster that can fly units to those other Islands.
Due to the need for speedy gains concerning those Islands, Players will need Aegis Cruisers and Voyagers to gain them soon enough.
I like NavyDAWG's Police Boat and Car but they are too large for my game. If I resize them the Guys riding in those units are far too small.