
Master diver in the United States Navy ranks as the highest level of diving qualification one can attain in warfare. These enlisted personnel have the most knowledge, experience, and training in all aspects diving and underwater salvage. Master divers must have at least 15 years experience and have completed a specialization training course. A specialization course can help you earn master diver status in the United States Navy.
PADI Master Scuba Diver
PADI Master Scuba Diver certification signifies that you have mastered scuba diving. The program can be offered by several North American training agencies like the National Association of Underwater Instructors or the Professional Association of Diving Instructors. This certification is considered the best available. The course requires that you dive at least 30 feet below water.

NAUI Master Scuba Diver
If you're ready to move on to a higher level of scuba diving, then a NAUI Master Scuba Diver course might be right for you. This course is designed to equip you with the knowledge necessary to organize dives for others. You'll learn to use a compass and perform underwater communications. Also, you'll learn how and where to dive. This course consists of both two open water and a classroom session.
NAUI Enriched Air (Nitrox) Diver
To enhance your diving experience, the NAUI Master Diver Course in Enriched Air (NITX). This course covers all aspects of enriched air diving including mixing Nitrox and Oxygen. The course will teach students how to analyze the mixture and what the physiology is of nitrogen and oxygen, as well as the dangers of handling these gases. They'll also learn about Equivalent Water Depth and common gases mixing techniques. The enriched oxygen course can be used as an extension to an open water diver's Scuba Diver certification.
NAUI Rescue Scuba Diver
You must take the required courses to achieve your goal of becoming a NAUI Rescue Scuba Diver Master Diver Instructor. This certification is a requirement for the NAUI FIT training course. You will be able to become a professional NAUI instructor or leader. To get started, take the Try Scuba program. The goal of this program is to teach you the basic skills and knowledge required to safely dive in open water.

NAUI First Aid course
NAUI First Aid for master divers will teach you how to respond to all kinds of emergencies that could occur in the water. Refresher sessions are included, as well as information on the latest First Aid standards. You will have the knowledge and skills to immediately respond to an emergency. It is hands-on and allows you to apply the skills you have learned in the classroom.