 American Academy of Underwater Sciences facilitates the development of safe and productive scientific divers through education, research, advocacy, and the advancement of standards for scientific diving practices, certifications and operations. |
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ANDI | American Nitrox Divers International. |
 CMAS - Confederation Mondiales Des Activities Subaquatiques (French scuba agency). |
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DRI | Dive Rescue International. |
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IANTD | International Association of Nitrox and Technical Divers. |
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IDA | International Divers Association, Inc. Training to those who will venture beyond the normal sport diving range. |
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IDEA | International Diving Educators Association |
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NACD | National Association for Cave Diving provides instruction in the principles of cave and cavern diving. |
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NASE | National Academy of Scuba Educators |
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NAUI | National Association of Underwater Instructors. |
 NOAA Diving Program - the National Oceanic & Atmospheric Administration (NOAA) offers SCIENTIFIC and WORKING DIVER Certification courses for federal, state, and local government employees - are not open to the public. |
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PADI | Professional Association of Diving Instructors |
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PDIC International | Professional Diving Instructors Corporation. |
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Performance Freediving | Instruction & Training in the field of breath-hold (apnea) diving from the leaders in the sport
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PSA | Professional Scuba Association International |
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SSI | Scuba Schools International |
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