| Acronym | Meaning |
 | GMDSS | Global Maritime Distress And Safety System |
| CAGE | Cerebral Arterial Gas Embolism |
| END | Equivalent Narcotic Depth |
| RYA | Royal Yachting Association |
| NASDS | National Association Of Scuba Diving Schools; Diving Instruction Organization. |
| TDT | Total Dive Time |
| ABT | Actual Bottom Time |
| BHA | British Hyperbaric Association |
| VENTID | Vision Ears Nausea Twitiching Irritation Dizziness |
| OWI | Open Water Instructor (BSAC) |
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