Scuba skills training is primarily provided by practical instruction directed by a registered or certified diving instructor. Additional practice and skills maintenance are the diver's responsibility. Recreational divers may attend refresher courses, which may involve revisions to earlier practices. Service providers such as dive shops and charter boats may require a checkout dive for divers unfamiliar with the region, or who haven't dived for some time. The checkout dive allows the diver to demonstrate basic skills relevant to the expected conditions.
