NAUI – National Association of Underwater Instructors

Logo of NAUI or National Association of Underwater Instructors scuba diving training agency

Al Tillman, (soon to become NAUI Instructor #1) was the director of sports for Los Angeles County Parks and Recreation during this period and established a training program sponsored by L.A. County to certify skin and scuba divers. In 1959 the National Diving Patrol was renamed the National Association of Underwater Instructors (NAUI).

Training offered: Recreational, Technical, Cave, Wreck, Ice, Rebreather, Gas Blending


Email: NA

Headquarter: United States of America
Address: 9030 Camden Field Parkway, Riverview, FL. 33578
Phone: +1 813-628-6284

UTD – Unified Team Diving

Logo of UTD or Unified Team Diving scuba training agency

In 2007, Andrew Georgitsis (co-founder and former Training Director of GUE 1997-2005) co-founded Unified Team Diving to pick up where DIR left off. What makes UTD different is their progressive approach of developing DIR into UTD diving.

UTD’s beginning curriculum is designed with the end goal in mind – where the end goal could be the most advanced level of deep cave. This end goal curriculum is implemented through their guiding ethos of always being Consistent, Scalable, and Interchangeable in all their skills, protocols, and equipment.

In UTD, there is no such thing as doing things one way for one type of diving, or a special piece of equipment for one type of diving, and another for another type of diving! The skills, techniques, and equipment used and taught at the lowest level are exactly the same as those used at the highest end goal level.

What makes UTD unique is the culture of it’s instructor family! Even though UTD instructors are scattered all over the world, they are united in their commitment to precision artful diving with a common sense attitude. UTD instructors see themselves primarily as coaches that help divers achieve their goals, and as certification evaluators secondarily. UTD’s instructor culture is what allows prospective UTD students to be able to depend on consistent training – regardless of which UTD instructor they choose.

Training offered: Recreational, Technical, Cave, Wreck



Headquarter: United States of America
Address: 8545 Arjons Drive Suite N, San Diego, CA, 92126
Phone: +1 (855) DIVE UTD (348-3883)

ACUC – American Canadian Underwater Certifications

Logo of the ACUC American Canadian Underwater Certifications agency

In 1969 numerous regional diving councils met together to create the Association of Canadian Underwater Councils later becomes American Canadian Underwater Certifications. Now as the company became more international its headquarter has been relocated to Madrid, Spain.

Training offered: Recreational, Wreck, Ice



Headquarter: Spain
Address: Añastro, 25 28033 Madrid
Phone: +34 917668412

IDEA – International Diving Educators Association

Logo of IDEA International Diving Educators Association

The International Diving Educators Association (IDEA) was originally established in 1952 as part of the FSDA (Florida Skin Divers Association), and later changed to the Florida Scuba Divers Association. FSDA was a large group of very active Florida dive clubs and has been the voice of the diver since 1952. Then in 1976 when the scuba diving portion became bigger the FSDA was included in IDEA.

Training offered: Recreational, Wreck



Headquarter: United States of America
Address: IDEA P.0. Box 8427 Jacksonville Fl, 32239
Phone: +1 904 744-5554

GUE – Global Underwater Explorers

GUE Global Underwater Explorers Logo

GUE or Global Underwater Explorers was established in 1999 by Jarrod Jablowski. Following WKPP’s introduction in 1995 of a standardized approach to gear configuration and diving procedures, there was a significant reduction in diving incidents within the Woodville Karst Plain cave system. This is the idea behind GUE.

Training offered: Recreational, Technical, Rebreather, Cave



Headquarter: US
Address: 18487 High Springs Main Street, High Springs, FL 32643
Phone: +1 (386) 454-0820, toll-free: (800) 762-DIVE (3483)

BSAC – British Sub-Aqua Club

Logo BSAC British Sub-Aqua Club

Established in London in 1953 by entrepreneur Oscar Gugen and journalist Peter Small, the British Sub-Aqua Club has evolved from a small group of dedicated members and diving pioneers to the BSAC we know today.

Training offered: Recreational, Technical, Rebreather



Headquarter: UK
Address: Telford’s Quay, South Pier Road, Ellesmere Port, Cheshire CH65 4FL
Phone: +44 (0)151 350 6200

CMAS – Confédération Mondiale des Activités Subaquatiques

CMAS is from the french name, Confédération Mondiale des Activités Sous-Marines and is named the World Underwater Federation in english. It was founded in 1959. One of the key founder and first president was the underwater explorer Jacques-Yves Cousteau. CMAS now comprises over 130 diving federations from 5 continents. It is the oldest training agency and the one that most of the standards are based.

Services offered: Recreational, Technical, Cave, Wreck, Rebreather, Freediving



Headquarter: Italy
Address: Viale Tiziano, 74
Phone: 0039 06 3211 0594 / 3

SSI – Scuba Schools International

SSI Scuba Schools International Logo

Founded in the United States of America in 1970, SSI has expanded to include more than 30 Service Centers, is represented in more than 110 countries with over 2,800 International locations, and has materials printed in more than 30 languages. It is now the second largest diving certification agency.

Training offered: Recreational, Technical


SDI – Scuba Diving International

In 1998 after strong demand at TDI for courses aimed at recreational and sports diving, SDI or Scuba Diving International was founded. It has roots in the technical aspect of diving but is meant to be for a broad audience.

Training offered: Recreational



Headquarter: United States of America
Address: 1321 SE Decker Ave, Stuart, Florida 34994, United States
Phone: 1-888 778 9073