| Acronym | Meaning |
 | CCR | Closed Circuit Rebreather |
| TO | Training Officer (BSAC) |
| AD | Adventure Diver (PADI) Advanced Diver (BSAC) |
| SWP | Safe Working Pressure |
| OW(D) | Open Water (Diver) (PADI) |
| ITC | Instructor Training Course (BSAC) |
| ROV | Remotly Operated Vehicle |
| PSI | Pounds Per Square Inch |
| AIE | Advanced Instructor Exam (BSAC) |
| RDP | Recreational Dive Planner |
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