| Acronym | Meaning |
 | IDC | Instructor Development Course (PADI) |
| MCS | Marine Conservation Society |
| IAND | International Association Of Nitrox Divers |
| EFR | Emergency First Response |
| SSI | Scuba Schools International; Diving Instruction Organization. |
| DV | Demand Valve |
| CNS | Central Nervous System |
| ITC | Instructor Training Course (BSAC) |
| DAN | Divers Alert Network |
| END | Equivalent Narcotic Depth |
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