Under most entry-level programs (SEI, SDI, PADI, BSAC, SSAC, NAUI, SSI, and PDIC), divers can complete a certification with as few as four open water dives. This complies with the minimum requirements of ISO 24801-2 Autonomous diver. Such a qualification allows divers to rent equipment, receive air fills, and dive without supervision to depths typically restricted to 18 meters (60 feet) with an equally qualified buddy in conditions similar to, or easier than those in which they were trained. Certification agencies advise their students to dive within the scope of their experience and training, and to extend their training to suit the conditions in which they plan to dive.
