| Acronym | Meaning |
 | MCA | Maritime And Coastguard Agency |
| ITS | Instructor Training Scheme (BSAC) |
| ADT | Actual Dive Time |
| IAND | International Association Of Nitrox Divers |
| BFK | Big F*cking Knife (reference To The Diver's Knife) |
| PP | Partial Pressure |
| PPB | Peak Performance Bouyancy |
| SAA | Sub-Aqua Association |
| OWSI | Open Water SCUBA Instructor (PADI) |
| PG | Pressure Group |
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