 The Confédération Mondiale des Activités Subaquatiques (CMAS) (World Underwater Federation) oversees an international system of recreational snorkel and scuba diver training and recognition.CMAS publishes minimum training standards which provide an international equivalence system for diver certification issued by its member federations.The World Recreational Scuba Training Council (WRSTC) publishes a series of nine course standards for recreational diver training.