Yin-Yang Island for Days of Ruin.

http://awbw.amarriner.com/prevmaps.php?maps_id=51573
I know, it will need improvement. But I'm convinced a decent map with navy warfare can be made in Days of Ruin. All is needed is good incentive to use navy units. See those neutral Factories? They can be used as an HQ siege foundation if you manage to get good enough momentum to spare the funds for it.