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This volume represents a significant departure from the Controllability Chapters of previous editions of the Principles of Naval Architecture in philosophy, in content and in name. The volume name Maneuverability is felt to reflect the intent of the chapter more adequately than does the title of the chapter in previous editions. The primary goal of previous chapters has been to provide information needed by designers to estimate the maneuvering performance and controllability of a ship based primarily on principal characteristics. With increasing ship sizes and concerns for ship and environmental safety, the accuracy of such estimates is now adequate only for earlier stages of ship design. Such methods can rarely provide sufficient accuracy for meaningful studies of critical maneuvering problems such as transit of restricted waterways and harbors. Such studies are now almost always carried out by organizations which specialize in maneuvering performance. A primary goal of this new volume is therefore to provide the designer with both the information and tools needed to design ships which can be reasonably expected to have satisfactory maneuverability and controllability, and to provide the knowledge needed to make cost-effective use of organizations specializing in maneuvering performance. To this end, this volume provides a more detailed introduction to the basics of maneuvering and a more detailed discussion of simulation and simulators than did previous editions. This volume also provides an expanded discussion of maneuverability and controllability of submarines and submersibles.