| Acronym | Meaning |
 | MSDT | Master SCUBA Diver Trainer (PADI) |
| AIE | Advanced Instructor Exam (BSAC) |
| HSE | Health And Safety Executive |
| SPG | Submerssible Pressure Guage |
| PSI | Pounds Per Square Inch |
| BWRAF | Buoyancy |
| OW(D) | Open Water (Diver) (PADI) |
| IDC | Instructor Development Course (PADI) |
| RDP | Recreational Dive Planner |
| AOW | Advanced Open Water |
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