I've changed...a lot
https://dl.dropboxusercontent.com/u/39210620/NavalWarfare.capx
You should make another topic to find someone, who will help to create a good, proper z-order.
I added only simple method which is working only on the PlayerShip. You should do it probably to all objects in the game, but it's not possible in that way. I think Array can help here somehow.
If someone will resolve this problem, i would be grateful if you give me an example. Maybe someday i will need this too.
Anyway. It was very good to work with something a lot more easier than my usual projects. Have a good one