Volume 1 of Basic Ship Theory has presented fundamental work on ship shape, static behaviour, hazards and protection and upon ship strength. It has also described in detail the environment in which marine vehicles have to work and the properties of the sea and the air. Now we are in a position to discuss the dynamic behaviour of ships and other vehicles in the complex environment in which they operate and how those surroundings can be controlled to the maximum comfort of vehicle and crew. We can also enter upon the creative activity of ship design.