2 Teams, 2 Islands. One player on each team is the landlord (he can't build ships), the other one is the sailor (he can only build ships). Choose in the beginning, who you want to be.
There are two bigger islands on which you start with your team mate, and a few smaller ones. The smaller ones can be useful to build outposts to control the sea.
Sailor and landlord both start with an explorer and a towncenter, like in any usual game. Additionally, the sailor has 4 docks, 2 outposts, a market, a church and a capitol. He can only only build a few economic buildings.
The landlord can build everything, except docks (and ships).
For each civilization, there is one deck for the sailor and one for the landlord.
The game ends, when the sailor loses all four docks.