Certification Agencies

Recreational Diving Training Agencies

ACUC
American Canadian Underwater Certification

Hyperbarics International
Hyperbaric Chamber Operations and Undersea Medical Training Programs.

IDEA
International Diving Educators Association

NASDS
National Association of Scuba Diving Stores

NAUI
National Association of Underwater Instructors

PADI
Professional Association of Underwater Instructors

PDIC
Professional Diving Instructors Corporation

SDI
Scuba Diving International

SSI
SCUBA Schools International

YMCA
Young Mens' Christian Association National SCUBA Program

Other Training Agencies

ANDI
American Nitrox Divers International
Nitrox, Rebreather, Gas Blender Certifications.

Dive Rescue International
Training and Equipment for Public Safety Professionals

IANTD
International Association of Nitrox and Technical Divers
Nitrox, Rebreather, Trimix, Mixed Gas, Deep Air, Oxygen Handling.

LGS
Lifeguard Systems
Water Rescue & Recovery, Surface Ice Rescue, Rapid Deployment, Public Safety Diver.

NACD
National Association for Cave Diving
Cavern, Intro Cave, Cave, Specialty Cave.

NSS-CDS
National Speleological Society - Cave Diving Section
Cavern, Intro Cave, Apprentice Cave, Full Cave.

NOAA Diving Program
Dive Planning Forms, Tables & Formulas.  Most files in PDF format.

Hal Watts - Forty Fathom Grotto/
Professional Scuba Association
Cave, Cavern, Nitrox, Techtrox, Trimix, Deep Air, Rebreather.

TDI
Technical Divers International
Nitrox, Decompression, Extended Range, Trimix, Deep Air, Rebreather.