During the past few years there have been considerable changes in the approach to ship stability, so far as it affects the merchant seaman. The most obvious of these is the introduction of metric units, in addition, examination requirements have been increased and recommendations for a standard method of presenting and using stability information have been produced, which will undoubtedly be reflected in the various examinations. This seventh edition has been designed to meet all these requirements. Basic information contained in early chapters has been retained for the benefit of anyone who is not familiar with the subject. The remainder of the text has been re-arranged and expanded, as desirable, to lead into new material which has been introduced, there is also a chapter on stability information to illustrate the standard method of presentation.