Open Water Ratings
- Introductory Scuba Experience - ISE
- ANDI Surface Diver - ASD
- Confined Environment Diver - CED
- Junior Sport Diver - (L1) JSD
- Open Water Sport Diver - (L1) OWD
- Ocean Scuba Diver-L2 OSD
- Ocean Diver - (L2) OCD
- Ocean Adventurer - (L2) OCA
- Advanced Open Water Diver - (L2) AOW
- Ocean Explorer - (L2) OCE
- Expert Scuba Diver - (L2) ESD
- Ocean Expert Explorer - (L2) OEE
- Rescue Diver - (L2) RSD
- Openwater Divemaster - (L2) CDM
- Assistant Instructor - (L2) ASI
- Open Water Instructor - (L1&2) OWI
- Advanced Openwater Instructor - AOWI
- Master Instructor - (L2) MSI
Read more about this topic: American Nitrox Divers International
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—Henry David Thoreau (1817–1862)