| Acronym | Meaning |
 | IDC | Instructor Development Course (PADI) |
| SAA | Sub-Aqua Association |
| RD | Rescue Diver (PADI) |
| HSE | Health And Safety Executive |
| DCS | Decompression Sickness |
| SWP | Safe Working Pressure |
| END | Equivalent Narcotic Depth |
| NASDS | National Association Of Scuba Diving Schools; Diving Instruction Organization. |
| OWIC | Open Water Instructor Course (BSAC) |
| CCR | Closed Circuit Rebreather |
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