A related matter is NAUI's name changes from "Open Water II" to "Advanced Scuba Diver." NAUI's program was, at the time, a 38 hr. Open Water I course, followed by a six dive Open Water II course (aka "Sport Diver"), followed by the third course in the sequence, "Advanced Diver." At the time, PADI had a similar progression. Then, PADI eliminated its upper level course (Advanced Open Water Diver) and repurposed the title for its middle course to gain a competitive advantage. NAUI followed suit, in an unsuccessful attempt to maintain market share. Publicly, NAUI claimed that this change was intended to address customer confusion as to the comparative rigors of training required to earn specific certifications.