It is a great Scuba Diving notebook for anyone who wants to track their number of dives either for their certification or just for recreation It is in a specially designed guided format to track all the essential things about the dive you have. You can keep a record of the following items & more. Location Depth Time Gear Used Marine Life Air Usage This divers logbook is a good choice for anyone who loves spending time under the ocean. The size of the notebook is 6"x9". It includes 100 pages for you to fill in and is bound with a matte paperback cover with a funny diving quote.