| Acronym | Meaning |
| DM | Dive Master (PADI) |
| OD | Ocean Diver (BSAC) |
| MSDT | Master SCUBA Diver Trainer (PADI) |
| C-CARD | Scuba Diving Certification Card. |
| DCAP | Decompression Computation And Analysis Program |
| SAR | Search And Rescue/Recovery |
| AA | Assisted Ascent |
| NAUI | National Association Of Underwater Instructors |
| TDT | Total Dive Time |
| ADT | Actual Dive Time |