| Acronym | Meaning |
 | ITW | Instructor Training Workshop (BSAC) |
| DCAP | Decompression Computation And Analysis Program |
| IDC | Instructor Development Course (PADI) |
| OWI | Open Water Instructor (BSAC) |
| OD | Ocean Diver (BSAC) |
| NITROX | Any Gas Mixture Of Nitrogen And Oxygen; Though Most Commonly Used For Oxygen Mixtures Above The Normal 21 Per Cent. |
| HID | High Intensity Discharge |
| EO | Equipment Officer (BSAC) |
| OW | Open Water Certification; First Certification Level. |
| ATA | Atmospheres Absolute |
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