Recreational diver training
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Not only is the underwater environment hazardous but diving equipment can be dangerous, there are unexpected problems that divers must learn to avoid. Divers need practice and a gradual increase in challenge to build their confidence in their equipment and themselves, to develop the skills needed to control the equipment and to respond properly if they encounter difficulties.
Most commercial operators and dive clubs serving divers insist that each diver is able to show them "certification", for the type of diving the diver intends to do. Dive operators, dive shops, and compressor operators on occasion have been known to refuse to allow uncertified people to dive, hire diving equipment or have their diving cylinders filled.
 Sources of diver training
Many diver training organizations exist, throughout the world, offering diver training leading to certification: the issuing of a "Diving Certification Card," also known as a "C-card," or qualification card.
Competent diving instructors may work independently or through a university, a dive club, a dive school or a dive shop. They will offer courses that meet, or exceed, the standards of the certification organization that they work with. Many dive shops in popular holiday locations offer courses that try to teach you to dive in a few days, and can be combined with your vacation.
Excellent advice on how to find quality diving instruction can be difficult to come by. There are computer bulletin boards such as ScubaBoard that, at their best provide sterling advice: "How to find an excellent SCUBA class," but that at their worst can be less than accurate.
 Location of training lessons
Initial training typically takes place in three environments:
- Classroom - where material is presented and reviewed
- Confined Water (Swimming pool or equivalent natural body of water) - where skills are taught and initially practiced.
- Open Water - where the student demonstrates and refines the skills he or she has learned.
The usual sequence for learning most diving skills is to be taught the theory in the classroom, be shown the skill and practice in a swimming pool or sheltered and shallow open water using the minimum equipment, then practice again in open water under supervision in full equipment and only then use the skill on real dives.
Typically, early open water training takes place in a local body of water such as a lake, a flooded quarry or a sheltered and shallow part of the sea. Advanced training mostly takes place at depths and locations similar to the diver's normal diving locations.
 Training topics
Most entry-level training is similar across the diver training agencies, although some may emphasize certain topics earlier in the program, such as the inclusion of diver rescue in syllabuses such as CMAS 1* and NAUI, and its absence from other equivalent courses such as PADI.
- Basic diving theory:
- Basic water skills:
- Basic open circuit scuba equipment skills:
- Basic Rebreather skills:
- Dive planning skills:
- Dive leading skills:
- Diver rescue techniques:
- Technical diving techniques:
- Using Nitrox as a bottom gas
- Using Nitrox as a decompression gas
- Planning accelerated decompression stops
- Normoxic Trimix as a bottom gas
- Hypoxic Trimix as a bottom gas
- Vocational techniques:
- Dive group leading skills:
- Logistical skills:
- Instructor skills:
- Teaching diving theory
- Teaching personal diving skills
- Teaching group diving, safety and rescue skills
- Teaching boat handling, seamanship and navigation skills
- Teaching instructing skills
 Scuba training for younger people
PADI allows 10 year olds to do the full Open Water Diver course. They are called "Junior Open Water" divers. There are restrictions on their depth and group size when diving. Also they must dive with their parents or a professional. When they reach the age of 12 they can dive with a qualified adult. Over 15 they are considered capable of diving with others of the same age or above.
BSAC allows 12 year olds to do the full entry level diving course - the Ocean Diver course. This qualification has no restrictions for the young diver, but individual branches of BSAC are free to set their own minimum age for branch membership.
 See also
- "How to find an excellent SCUBA class". Scubaboard. 2011. Retrieved 2011-12-13.
- "C.M.A.S. Diver Training Program". Confédération Mondiale des Activités Subaquatiques. 2005-01-18. pp. 4, 6. Retrieved 2009-09-23. 1 T 10 and 1 P 6 cover rescue.
- NAUI. "Scuba Diver Course". NAUI. Retrieved 26 December 2011.
- NAUI (2010). NAUI Standards and Procedures. Tampa, FL, USA: NAUI.
- PADI (2010). PADI Instructor Manual. Rancho Santa Margarita, CA: USA: PADI.