From
SDI Advanced Scuba Diver Development Program - SDI | TDI | ERDI:
SDI Advanced Diver minimum requirements:
- Complete four SDI, TDI, or ERDI Specialty Diver courses or equivalent; only 1 course without dives, may be credited towards the SDI Advanced Diver development program, with the exception of SDI Computer Nitrox
- Proof of 25 logged dives
- After the previous requirements are met and verified by an instructor, the instructor issues the SDI Advanced Open Water Diver certification by submitting the SDI Diver Registration form to SDI Headquarters or the appropriate Regional Office, or registering the students online through member’s area of the SDI website
- Requirements for the SDI Junior Advanced include the above requirements, provided the four specialty courses they have taken are allowed by their age
From
Advanced Open Water Diver | PADI:
There are two required dives – Deep and Underwater Navigation – and you choose the other three, for a total of five dives.
If you want to stick with the PADI system, I recommend taking 3 skills courses, including navigation for starters. That will put you at adventure diver, which is the prerequisite for the deep course. One more elective, and you are at AOW. Not the typical route, but a better one that is equivalent to the definition of advanced of other dive agencies. Just my 2 psi/bar.