SCUBA DIVING CERTIFICATION

American Canadian Underwater Certifications (ACUC) (formerly Association of Canadian Underwater Councils) - originated in Canada in 1969 and expanded internationally in 1984

British Sub Aqua Club (BSAC) - based in the United Kingdom, founded in 1953 and is the largest dive club in the world

European Committee of Professional Diving Instructors (CEDIP) - based in Europe since 1992 (see Cedip on French Wiki pages)

Confederation Mondiale des Activites Subaquatiques (CMAS), the World Underwater Federation

National Association of Underwater Instructors (NAUI) - based in the United States

Professional Diving Instructors Corporation (PDIC) - based in the United States

Scottish Sub Aqua Club (SSAC or ScotSAC) the National Governing Body for the sport of diving in Scotland.

International Training SDI, TDI & ERDi - based in the United States, TDI is the world's largest technical diving agency, SDI is the recreational division focusing on new methods and online courses, and ERDi is the public safety component

Scuba Schools International (SSI) - based in the United States with 35 Regional Centers and Area Offices around the globe

YMCA scuba - based in the U.S., part of Young Men's Christian Association (YMCA), a Christian related organization (open to all faiths, ages and genders despite the historic name)