| Acronym | Meaning |
 | RD | Rescue Diver (PADI) |
| AIE | Advanced Instructor Exam (BSAC) |
| IDEA | International Diving Educators Association; Diving Instruction Organization. |
| MSD | Master SCUBA Diver (PADI) |
| RNT | Residual Nitrogen Time |
| BWRAF | Buoyancy |
| ROV | Remotly Operated Vehicle |
| NI | National Instructor (BSAC) |
| TP | Test Pressure |
| AMDT | Adjusted Maximum Dive Time |
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