| Acronym | Meaning |
 | DV | Demand Valve |
| NASDS | National Association Of Scuba Diving Schools; Diving Instruction Organization. |
| NAUI | National Association Of Underwater Instructors |
| MCS | Marine Conservation Society |
| CAGE | Cerebral Arterial Gas Embolism |
| GMDSS | Global Maritime Distress And Safety System |
| RDP | Recreational Dive Planner |
| MCA | Maritime And Coastguard Agency |
| DM | Dive Master (PADI) |
| OWSI | Open Water SCUBA Instructor (PADI) |
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