| Acronym | Meaning |
 | DEMA | Diving Equipment Manufacturers Association |
| MOD | Maximum Operating Depth |
| NI | National Instructor (BSAC) |
| RD | Rescue Diver (PADI) |
| DPV | Diver Propulsion Vehicle |
| TO | Training Officer (BSAC) |
| AAS | Alternate Air Source |
| DIN | Deutsches Insitut Fuer Normung |
| RYA | Royal Yachting Association |
| OW | Open Water Certification; First Certification Level. |
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