| Acronym | Meaning |
| IDC | Instructor Development Course (PADI) |
| OW | Open Water Certification; First Certification Level. |
| RIB | Rigid-Hulled Inflatable Boat |
| HSE | Health And Safety Executive |
| DPV | Diver Propulsion Vehicle |
| OWIC | Open Water Instructor Course (BSAC) |
| SSI | Scuba Schools International; Diving Instruction Organization. |
| EAR | Expired Air Resuscitation |
| MCA | Maritime And Coastguard Agency |
| RDP | Recreational Dive Planner |