The leadership and instructor levels of certification are:
NAUI's Familiarization-Instruction-Testing (FIT) Program is a prerequisite for enrollment in the NAUI Assistant Instructor course, NAUI Divemaster course, or NAUI Instructor Crossover Course (ICC).
The Skin Diving Instructor certification (formerly Skin Diving Leader) has long been unique to NAUI. It qualifies individuals to train and certify skin divers and conduct snorkeling experience programs.
Both the Assistant Instructor and Divemaster ratings allow individuals to attend an Instructor Training Course (ITC) to be trained and qualified as NAUI Instructors.
The program includes both instruction and evaluation. Enrollees receive the information needed to prepare for NAUI membership and NAUI leadership training. Participants are given knowledge, water skill and other performance evaluations, critiques and counseling to ensure they are aware of their state of preparedness for NAUI membership and continued leadership training.