| Acronym | Meaning |
 | BC | Bouyancy Compensator |
| MSD | Master SCUBA Diver (PADI) |
| IAND | International Association Of Nitrox Divers |
| SI | Surface Interval |
| OWIC | Open Water Instructor Course (BSAC) |
| SWP | Safe Working Pressure |
| OW(D) | Open Water (Diver) (PADI) |
| NASDS | National Association Of Scuba Diving Schools; Diving Instruction Organization. |
| MCA | Maritime And Coastguard Agency |
| ATA | Atmospheres Absolute |
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