| Acronym | Meaning |
 | PG | Pressure Group |
| ABT | Actual Bottom Time |
| DSMB | Delayed Surface Marker Buoy |
| AIC | Advanced Instructor Course (BSAC) |
| AIE | Advanced Instructor Exam (BSAC) |
| AI | Assistant Instructor (PADI) Advanced Instructor (BSAC) |
| MDT | Maximum Dive Time |
| OD | Ocean Diver (BSAC) |
| PPB | Peak Performance Bouyancy |
| GMDSS | Global Maritime Distress And Safety System |
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