| Acronym | Meaning |
 | ITS | Instructor Training Scheme (BSAC) |
| CAGE | Cerebral Arterial Gas Embolism |
| MCS | Marine Conservation Society |
| HP | High Pressure |
| NASDS | National Association Of Scuba Diving Schools; Diving Instruction Organization. |
| TDT | Total Dive Time |
| DAN | Divers Alert Network |
| OW(D) | Open Water (Diver) (PADI) |
| NITROX | Any Gas Mixture Of Nitrogen And Oxygen; Though Most Commonly Used For Oxygen Mixtures Above The Normal 21 Per Cent. |
| CESA | Controlled Emergency Swimming Ascent |
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