I would imagine you did not put a collision box on it? because that often crashes my game when i forget.
if you dont have it then i will tell you how...
make a convex shape it must be convex that surrounds the boat where you want it to collide with things, then name it collision and give it a LOD of -1 (for MS3d) i dont know blender, but if any of that makes sence i would try it on your ship.
dont woory if the collision box is ugly in your modeling program, it will be invisible in game.