NAUI: The Definition of Diving (Video revised) In scuba diving, the National Association of Underwater Instructors (NAUI Worldwide) is the name synonymous with being a leader and an originator. Throughout scuba diving’s history, it is NAUI leaders, pioneers and trend setters who have defined the sport. Whether in the establishment of scuba instructional standards, equipment development, advancements in diving research, or dive training innovations, NAUI leaders have paved the way for scuba diver