PADI (Professional Association of Diving Instructors) is the largest and most recognized snorkeling certification agency in the world, with over 25 million certifications issued.

The minimum age requirement for obtaining a PADI snorkeling certification is 10 years old.

The maximum depth limit for snorkeling with a PADI snorkeling certification is 12 feet (3.7 meters).

The three main components of the PADI snorkeling certification course are knowledge development, confined water skills, and open water skills.

The purpose of the knowledge development component of the PADI snorkeling certification course is to teach snorkelers about the equipment they will be using, the marine environment and how to protect it, and the risks and hazards of snorkeling.

The purpose of the confined water skills component of the PADI snorkeling certification course is to teach snorkelers how to use their snorkeling equipment properly, how to snorkel safely and efficiently, and how to rescue themselves and others in the water.

The purpose of the open water skills component of the PADI snorkeling certification course is to teach snorkelers how to snorkel in different conditions, how to identify and avoid hazards in the water, and how to interact with marine life responsibly.

The minimum age requirement for obtaining an SSI snorkeling certification is 8 years old.

The maximum depth limit for snorkeling with an SSI snorkeling certification is 15 feet (4.6 meters).

The three main components of the SSI snorkeling certification course are knowledge development, pool skills, and open water skills.

The purpose of the knowledge development component of the SSI snorkeling certification course is to teach snorkelers about the equipment they will be using, the marine environment and how to protect it, and the risks and hazards of snorkeling.

The purpose of the pool skills component of the SSI snorkeling certification course is to teach snorkelers how to use their snorkeling equipment properly, how to snorkel safely and efficiently, and how to rescue themselves and others in the water.

The purpose of the open water skills component of the SSI snorkeling certification course is to teach snorkelers how to snorkel in different conditions, how to identify and avoid hazards in the water, and how to interact with marine life responsibly.

The minimum age requirement for obtaining a NAUI snorkeling certification is 10 years old.

The maximum depth limit for snorkeling with a NAUI snorkeling certification is 20 feet (6.1 meters).

The three main components of the NAUI snorkeling certification course are knowledge development, confined water skills, and open water skills.