| Acronym | Meaning |
 | IAND | International Association Of Nitrox Divers |
| OWIC | Open Water Instructor Course (BSAC) |
| ITW | Instructor Training Workshop (BSAC) |
| TNT | Total Nitrogen Time |
| SAA | Sub-Aqua Association |
| DM | Dive Master (PADI) |
| PADI | Professional Association Of Diving Instructors |
| MSD | Master SCUBA Diver (PADI) |
| ITS | Instructor Training Scheme (BSAC) |
| END | Equivalent Narcotic Depth |
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