| Acronym | Meaning |
 | CCR | Closed Circuit Rebreather |
| BWRAF | Buoyancy |
| GPS | Global Positioing System |
| DSMB | Delayed Surface Marker Buoy |
| NAUI | National Association Of Underwater Instructors |
| AGE | Aterial Gas Embolism |
| CAGE | Cerebral Arterial Gas Embolism |
| EO | Equipment Officer (BSAC) |
| PP | Partial Pressure |
| IDEA | International Diving Educators Association; Diving Instruction Organization. |
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