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PADI is recognised as the largest recreational diver training agency with the largest rate of issue of diver certification, and the largest membership of professional instructors and dive leaders in recreational diving. They are a for-profit organization focused on efficiency of training of the largest number of customers.
The Professional Diving Instructors Corporation (PDIC) is an international SCUBA training and certification agency.It has an estimated 5 million active recreational divers.
The National Association of Underwater Instructors (NAUI Worldwide) is a nonprofit association of scuba instructors founded in 1960 by Albert Tillman and Neal Hess. [2] [3]NAUI primarily serves as a recreational dive certification and membership organization, providing international diver standards and education programs.
The Diving Certification model originated at Scripps Institution of Oceanography (SIO) in 1952 after two divers died whilst using university-owned equipment. [3] The then President of the University of California, Robert Gordon Sproul, restricted diving to those who had been trained through the program at SIO and thus "certification" was born.
The basic PADI Open Water Instructor is limited in which specialties they can instruct, and there are a relatively large number of further courses that must be taken to teach other specialties. [18] CMAS has a tiered system of instructor qualifications, from 1-star to 3-star.
Certification requirements for AOWD includes theory learning and assessment, practical training and assessment, and a minimum requirement for number of logged dives, that varies between agencies. SSI requires 24 logged dives. [2] PADI requires 5 dives on course, and the prerequisite is OWD which requires 4 open water dives.
On 1 November 2020, PADI Open Water Diver Linnea Rose Mills [1] drowned during a training dive in Lake McDonald in Glacier National Park, Montana, while using an unfamiliar and defective equipment configuration, with excessive weights, no functional dry suit inflation mechanism, and a buoyancy compensator too small to support the weights, which were not configured to be ditched in an emergency.
Divers Alert Network (DAN) is a group of not-for-profit organizations dedicated to improving diving safety for all divers. It was founded in Durham, North Carolina, United States, in 1980 at Duke University providing 24/7 telephonic hot-line diving medical assistance.