| Acronym | Meaning |
 | PADI | Professional Association Of Diving Instructors |
| NAUI | National Association Of Underwater Instructors |
| EO | Equipment Officer (BSAC) |
| GMDSS | Global Maritime Distress And Safety System |
| DIN | Deutsches Insitut Fuer Normung |
| TO | Training Officer (BSAC) |
| END | Equivalent Narcotic Depth |
| BSAC | British Sub-Aqua Club |
| SI | Surface Interval |
| ADT | Actual Dive Time |
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