| Acronym | Meaning |
 | MSD | Master SCUBA Diver (PADI) |
| AMDT | Adjusted Maximum Dive Time |
| RSTC | Recreational Scuba Training Council. Organization That Sets Basic Guidelines For Scuba Diving Agencies. |
| RD | Rescue Diver (PADI) |
| SWP | Safe Working Pressure |
| IDC | Instructor Development Course (PADI) |
| SSI | Scuba Schools International; Diving Instruction Organization. |
| ITC | Instructor Training Course (BSAC) |
| SPG | Submerssible Pressure Guage |
| TDT | Total Dive Time |
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