Adds massive cargo ships to the game, that function similarly to trains. Also adds tanker ships, train bridges. NOTE: In 2.1, You Must Install Oil Rigs Separately!
You need to download the mod Island Worlds, and use "many small islands" map type.
600% Scale slider - Water
50% Map coverage - Water
That's it. With that preset I have a map with continent-like formations. Perfect for cargo ships.