| Acronym | Meaning |
 | OWSI | Open Water SCUBA Instructor (PADI) |
| ITS | Instructor Training Scheme (BSAC) |
| EFR | Emergency First Response |
| OW | Open Water Certification; First Certification Level. |
| EO | Equipment Officer (BSAC) |
| DEMA | Diving Equipment Manufacturers Association |
| RNT | Residual Nitrogen Time |
| MSDT | Master SCUBA Diver Trainer (PADI) |
| LAT | Lowest Astonomical Tide |
| AA | Assisted Ascent |
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