The two most recognized and respected certifying scuba associations are PADI and NAUI. If you are being trained by an instructor who bears PADI or NAUI credentials you can be assured you are learning proper techniques and a guaranteed standard of quality. Quality scuba training is also offered by the YMCA, Scuba Schools International (SSI) and PDIC.
PADI is the Professional Association of Diving Instructors. PADI sets a standard of quality for diving instructors and offers curricula in dozens of specialized diving techniques. PADI was founded in 1967 and issues over 850,000 certifications every year. Since 1967 PADI has issued over 10 million certifications. PADI offers many levels and courses from beginner to advanced.
NAUI is the National Association of Underwater Instructors. NAUI is a highly respected international association and is esteemed worldwide for the indispensable NAUI repetitive dive tables. Like PADI, NAUI sets a standard of quality for diving instructors and offers curriculum guides and certification. By reputation, the NAUI standards are slightly higher than most, the curricula are more complete and NAUI certification is a little more challenging than other programs. When your instructor uses NAUI materials and training you are arguably getting the best training available anywhere.
Founded in 1970, Scuba Schools International offers school-based scuba diving education and scuba certification. An SSI certification card is accepted at all dive shops for rentals and diving packages.