Diving Instruction - Diver Training
Marin County, San Francisco North Bay, Ca. USA

A good dive training organization, such as a dive school based at a dive shop, will always offer courses to the standard of a recognized certification organization, such as those listed below. Many dive shops in popular holiday locations offer courses that can teach you to dive in a few days, and can be combined with your vacation. Upon completing the course the student is issued a certification card.

Entry-level recreational SCUBA diver training organizations:
using professional instructors. Examples of this type are ACUC,SDI (Scuba Diving International) SSI, PADI and NAUI  amateur instructors.
Technical recreational SCUBA diving organisations. Examples of this type are ANDI, DSAT Tec (PADI), GUE, IANTD, TDI, USC (SSI), and NAUI Tec
Commercial diver training organizations. Train divers for professional diving using SCUBA, surface supplied diving and saturation diving equipment and techniques.
National navies and armed forces. Train divers for ship maintenance, salvage and repair, rescue, mine clearance and covert operations using SCUBA and more advanced equipment and techniques.