Thanks, I went in an centred it.
However, now I have a new problem. With the way I built the ship yard, it has a solid floor beneath where the ship will get built... Well, that what was imagined, but now my ships build inside the floor because of the height of the ship yard. I've gone tried adjusting the height, but even moving the entirre model down still results in a ship being built inside the floor.
Any advice?