Understanding the vehicles

[kirbwarrior]

The main problem I'm having right now is that I don't know how to edit vehicle movement and where it can go. One thing I want is to make it so ships can only go on deep water, not shallow water like boats. Another is just to understand the airship in general. How do you make it go up and down? How do you stop it from landing somewhere? Can you make it not fly over certain things? Also, can you have multiple vehicles on the same map of the same type?(say, two ships and three airships)

The main I want to know is the ship thing. I love making it work like that in 2k3.