Our instructors here at Cayman Diving College teach a wide variety of specialties, each specialty is different.  Typically, the number of dives can range from no dives to 4 per specialty and each has a different amount theory involved.  You can gain credit from the Advanced Open Water course or Adventure dives for each specialty. I.e. if you wish to complete the Underwater Navigation specialty and you are Advanced Open Water, you only need to complete the second of the two dives needed as you would have completed one in your Advanced Course.  The Enriched Air Diver course can now be completed online with the PADI e-learning program.