| Acronym | Meaning |
 | IDC | Instructor Development Course (PADI) |
| ADT | Actual Dive Time |
| SSI | Scuba Schools International; Diving Instruction Organization. |
| MDT | Maximum Dive Time |
| OW | Open Water Certification; First Certification Level. |
| NITROX | Any Gas Mixture Of Nitrogen And Oxygen; Though Most Commonly Used For Oxygen Mixtures Above The Normal 21 Per Cent. |
| MCS | Marine Conservation Society |
| RD | Rescue Diver (PADI) |
| HPNS | High Pressure Nervous Syndrome |
| PADI | Professional Association Of Diving Instructors |
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