| Acronym | Meaning |
 | NAUI | National Association Of Underwater Instructors |
| SAA | Sub-Aqua Association |
| AIE | Advanced Instructor Exam (BSAC) |
| ITW | Instructor Training Workshop (BSAC) |
| ADT | Actual Dive Time |
| HSE | Health And Safety Executive |
| END | Equivalent Narcotic Depth |
| CAGE | Cerebral Arterial Gas Embolism |
| SPG | Submerssible Pressure Guage |
| SAR | Search And Rescue/Recovery |
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