The idea of having 4 equivalent sectors for each sea is fantastic! It completely changes the gameplay. Seas are almost impossible to "conquer" and hold, too many borders. Moreover, they don't give any bonus. It's the land that gives revenue (armies) the seas are only for moving armies and it is very difficult to blockade them. Excellent idea. This said, I find the bonuses a bit unbalanced. i.e. Aragona 5 armies for 2 territories, against Hungary (2 armies, 2 territories). I guess you tried to balance for "difficult-to-hold" bonuses, but the difference between the isolated ottoman empire and aragona or sicily is striking. Overall a nice map, with extremely new ways of playing, making it kind of fun even against AI. I used your suggested 25/40 off/def making the seas as they are supposed to be. Congratulations! 5 stars for the idea of the seas, hoping that it spreads to other maps, 4 stars overall for the balance issues (difficult, anyhow, in such small map).