| Acronym | Meaning |
 | IDEA | International Diving Educators Association; Diving Instruction Organization. |
| AIC | Advanced Instructor Course (BSAC) |
| BSAC | British Sub-Aqua Club |
| SAR | Search And Rescue/Recovery |
| PP | Partial Pressure |
| AD | Adventure Diver (PADI) Advanced Diver (BSAC) |
| BHA | British Hyperbaric Association |
| SAA | Sub-Aqua Association |
| RDP | Recreational Dive Planner |
| PPB | Peak Performance Bouyancy |
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