This new edition of Stanford's Sailing Companion incorporates changes in emphasis which the publishers and I considered desirable after obtaining constructive criticism of earlier editions from interested individuals and organisations. Il is hoped that these changes will be regarded as improvements by the yachting fraternity generally. The originai concept some years ago was to produce a book which would be of value both as a nautical guide and as an almanac. Over the years, however, it has become apparent that the Companion is regarded as useful in the first role and of small value in the second, yachtsmen preferring to seek port information, ti dal data and other intelligence of a changing nature from traditionally used publications produced by the Hydrographic Olfice and private publishers. In recognition of this apparent fact sections of this latter material, ever-changing as it is, have been omitted and, because it appeared either essential or desirable, the former category has been amplified and extended. Among other things, the tidal chapter has been rewritten to include detailed explanations of how tidal calculations are made; the originai chapter which was entitled 'Safety' has been enlarged to two chapters, one on safety and safety equipment and another on emergency procedures, and a new chapter about anchors and anchorwork has been introduced. I believe, in my simplicity, that both budding and experienced yachtsmen, and instructors too , will regard the changes as improvements, the text now more nearly conforming to generally recommended techniques aod procedures taught at navigational and sailing schoals, and practised aboard well-organised yachts. I think and hope that the basic character of the Companion has for the most part been prese rved and that the book remains one which is as much a companion at home as afloat.