Thanks Amos!

Cheers for pointing out the overlay issue. It looks like the problem is using screen.width to set the border/surround size dynamically which works in full screen on my mac but I guess won't work in all circumstances. Hopefully it should be a quick fix.

For the movement the code is unchanged. I just speeded it up by setting the fast option as default which makes it look like more stops for the ships. Waiting around for all the pirate ships to move every time I made a change was taking forever!