| Acronym | Meaning |
 | NAUI | National Association Of Underwater Instructors |
| SAR | Search And Rescue/Recovery |
| DSMB | Delayed Surface Marker Buoy |
| RD | Rescue Diver (PADI) |
| RIB | Rigid-Hulled Inflatable Boat |
| OWI | Open Water Instructor (BSAC) |
| TP | Test Pressure |
| SAA | Sub-Aqua Association |
| MCS | Marine Conservation Society |
| NITROX | Any Gas Mixture Of Nitrogen And Oxygen; Though Most Commonly Used For Oxygen Mixtures Above The Normal 21 Per Cent. |
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