| Acronym | Meaning |
 | SWP | Safe Working Pressure |
| BHA | British Hyperbaric Association |
| AOW | Advanced Open Water |
| MDT | Maximum Dive Time |
| DIN | Deutsches Insitut Fuer Normung |
| NAUI | National Association Of Underwater Instructors |
| ABT | Actual Bottom Time |
| OWI | Open Water Instructor (BSAC) |
| CMAS | Confederation Moniale Des Activities Subaquatiques |
| DM | Dive Master (PADI) |
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