National Dive League (NDL) - an organization that has developed a large number of unique programs for the training of scuba divers (divers) and freedivers
1. Textbooks, in which detail is written all the stages of organizing of dives and set out the necessary framework for physics, physiology, diving, snorkelling equipment, general oceanography, practical skills, strict methodical sequence of learning material, etc.
2. The system of certification of divers different levels of training. Certification of scuba diver says about the level of training, experience and maximum depth for the diver. For example, scuba diver, who trained in Moscow or in London arrived in Sharm El Sheikh, Phuket or Koh Tao and as a confirmation of the level of his training shows his international diving certificate - license.
3. Methodological manual for professional instructors. This instructor manual - book in which the summary of lectures and meticulously prescript study plan.
4. The uniform database of certified divers and free divers both for amateurs and professionals.