Removed yoffset from world altitude.

src/engine/gameManager/ZoneManager.java

@@ -471,7 +471,7 @@ public enum ZoneManager {
         // Child of seafloor
 
         if (parentZone.getParent() == null)
-            return worldAlttitude + zone.getYCoord();
+            return worldAlttitude;
 
         // return height from heightmap engine at zone location