GC plus.David and Charles,1984.New edition.Large format paperback(some creases,nicks,ink marks and scratches on the cover and spine) in good condition plus.Illustrated with many colour,b/w photos,drawings,diagrams,maps.Nice and clean pages with small ink marks,nicks and light shelf wear on the outer edges,small creases,nicks and pencil marks impressions on the edges of the pages,previous owner's name and writting written on the edges of the first and last pages of the book.The book is in GC plus with light shelf wear.159pp including List of illustrations,appendix: Navigations terms.