Obtaining a PADI Open Water Diver License on Okinawa's main island. What is a "C Card"?
The official name is Certification Card. It is a certificate that proves that you have acquired knowledge and skills (instruction standards). There are several types, such as Open Water Diver and Advanced Open Water Diver, depending on the diver's rank and technique. If you don't dive for a while, your skills will deteriorate, so it is recommended that you take a course to refresh your knowledge. Introductory level courses teach the knowledge and skills necessary to dive with a buddy (an instructor, staff member, or other diving partner) during the day in calm sea conditions at a depth of 18m or less.