ISO 24803:2017 specifies requirements for service providers in the field of recreational scuba diving and snorkelling excursions. It specifies the following areas of service provision: - introductory diving activities; - snorkelling excursions; - provision of training and education; - organized and guided diving for qualified divers; - rental of diving and snorkelling equipment. Service providers can offer one or more of these services. ISO 24803:2017 specifies the nature and quality of the services to the client. ISO 24803:2017 does not apply to freediving (also called "apnea diving").