The requirements for an Autonomous Diver are legally determinded in ISO 24801-2:2007 and EN 14153-2:2003.
Training for level two must include at least four open-water dives.
A level-two diver is qualified to dive: To a maximum depth of 20 meters, on dives that don’t require in-water decompression stops and where there is appropriate support at the surface. With other divers of the same level without the direct supervision of an instructor.
The following dive courses are certified:
American Nitrox Divers International (ANDI) – Open Sport Diver