| Acronym | Meaning |
 | AI | Assistant Instructor (PADI) Advanced Instructor (BSAC) |
| PG | Pressure Group |
| OWSI | Open Water SCUBA Instructor (PADI) |
| TDT | Total Dive Time |
| GMDSS | Global Maritime Distress And Safety System |
| DM | Dive Master (PADI) |
| ITC | Instructor Training Course (BSAC) |
| HPNS | High Pressure Nervous Syndrome |
| DIN | Deutsches Insitut Fuer Normung |
| MCA | Maritime And Coastguard Agency |
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