Gtaylor is correct. any 5. So I guess boat diver, fish ID, project aware, bug eye mask, and manatee wrangler, make you a master diver. See why it's not worth the 40 bucks. I wish it would require some actual diving specialties that are worthwhile. And no your padi specialties woukd not count towards NAUI master diver. It's set up quite differently. 23 hours of estimated classroom time, widest variety of diving envrionments as possible. Required dives in deep w simulated decompression, limited vis/night, search and recovery- light salvage, emergency procedures and rescue. Number of dives is set by the instructor but a minumum of 8 is required in the course. The 5 noted plus 3 of the following elective dives involving practical applications of skin diving, basic scuba skills, environmental study or survey, air consumption, boat diving, shore diving, hunting and collecting, special interest. Usually the instructor requires a demonstration of the practical applications with an academic presentation of each. Academics include classroom sessions covering applied sciences-physics, physiology, medical aspects and fitness. Diving equipment, Diving risks, diving environment, uw navigation, limited visibility, search and recovery- light salvage, deep and simulated decompression( theory and practical applications). the instructor may require exams and tests in all the areas. ALso it is not unusual for the instructor to require a set number of dives before starting the course and doing a skill eval to see if you're ready to start it.