| Acronym | Meaning |
| RNT | Residual Nitrogen Time |
| RIB | Rigid-Hulled Inflatable Boat |
| RDP | Recreational Dive Planner |
| OW(D) | Open Water (Diver) (PADI) |
| AAS | Alternate Air Source |
| VENTID | Vision Ears Nausea Twitiching Irritation Dizziness |
| EAR | Expired Air Resuscitation |
| DL | Dive Leader (BSAC) |
| IDEA | International Diving Educators Association; Diving Instruction Organization. |
| SCUBA | Self Contained Underwater Breathing Aparatus |