There has been data ("Yachtmaster Exercises for Sail and Power: Questions and Answers for the RYA Yachtmaster(r) Certificates of Competence - ISBN-13 978-1-4081-8331-1") available for this ISBN from the data sources that books-by-isbn.com uses, but not on the latest request on Sun Sep 1 15:06:16 2019, so the data displayed here has been removed .