| Acronym | Meaning |
 | SAR | Search And Rescue/Recovery |
| IAND | International Association Of Nitrox Divers |
| NI | National Instructor (BSAC) |
| IDEA | International Diving Educators Association; Diving Instruction Organization. |
| OW | Open Water Certification; First Certification Level. |
| DEMA | Diving Equipment Manufacturers Association |
| SCUHA | Self-contained Underwater Heating Apparatus (urinating In Your Wet Suit). |
| END | Equivalent Narcotic Depth |
| PG | Pressure Group |
| AGE | Aterial Gas Embolism |
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