Chapter 8 Manoeuvring
8.1 General Concepts
All ships require to be controllable in direction in the horizontal plane so that they can proceed on a straight path, turn or take other avoiding action as may be dictated by the operational situation. They must further be capable of doing this consistently and reliably not only in calm water but also in waves or in conditions of strong wind. In addition, submarines require to be controllable in the vertical plane, to enable them to maintain or change depth as required whilst retaining control of fore and aft pitch angle.
Considering control in the horizontal plane, a study of a ship's manoeuvrability must embrace the following:
(a) the ease with which it can be maintained on a given course. The ...