| Acronym | Meaning |
 | RD | Rescue Diver (PADI) |
| PG | Pressure Group |
| DSMB | Delayed Surface Marker Buoy |
| CAGE | Cerebral Arterial Gas Embolism |
| DO | Dive Officer (BSAC) |
| MCA | Maritime And Coastguard Agency |
| AIE | Advanced Instructor Exam (BSAC) |
| TDT | Total Dive Time |
| CMAS | Confederation Moniale Des Activities Subaquatiques |
| RYA | Royal Yachting Association |
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