There has been data ("Yachtmaster Exercises for Sail and Power: Questions and Answers for the RYA Yachtmaster(r) Certificates of Competence - ISBN-13 978-1-4081-8323-6") available for this ISBN from the data sources that books-by-isbn.com uses, but not on the latest request on Mon Jul 1 19:23:34 2019, so the data displayed here has been removed .