Advanced Scuba Diver
PADI's Advanced course is a total of five dives; each dive being in a different specialty. Deep and Navigation are required.
With NAUI's advanced diver, you'll do 8 dives instead of 5. Navigation, night, and 3 deep dives are required.
SDI's Advanced Diver is not a course. Instead, once you complete at least 25 dives and 4 SDI, TDI, and / or ERDI specialty courses, you are eligible to receive your Advanced Diver certification.