| Acronym | Meaning |
| RDP | Recreational Dive Planner |
| NI | National Instructor (BSAC) |
| PDIC | Professional Diving Instructors Corporation International; Diving Instruction Organization. |
| MDT | Maximum Dive Time |
| BC | Bouyancy Compensator |
| IOC | Instructor Orientation Course (PADI) |
| SAA | Sub-Aqua Association |
| DL | Dive Leader (BSAC) |
| CAGE | Cerebral Arterial Gas Embolism |
| MCS | Marine Conservation Society |