You can sail and attack at sea,
do missions, play mini games, get equipment, buy, sell, etc etc from the city,
Form consortium's' and guilds
consortium's can over take city's and run the taxes
that's about it.
There no mining, farming or any other such thing in the game play
just ship to sea battles and maybe some siege on city's to acquire them.
The mapping is almost Identical to Voyage Century,
I may even go as far as saying its a direct copy with implements taken out.
graphic models enhanced along with ocean graphs etc etc.
I need to play it to really find out how it goes