| Acronym | Meaning |
| ATA | Atmospheres Absolute |
| OWIC | Open Water Instructor Course (BSAC) |
| GMDSS | Global Maritime Distress And Safety System |
| PADI | Professional Association Of Diving Instructors |
| TDT | Total Dive Time |
| DPV | Diver Propulsion Vehicle |
| C-CARD | Scuba Diving Certification Card. |
| IAND | International Association Of Nitrox Divers |
| NASDS | National Association Of Scuba Diving Schools; Diving Instruction Organization. |
| SSI | Scuba Schools International; Diving Instruction Organization. |