| Acronym | Meaning |
 | MCA | Maritime And Coastguard Agency |
| DV | Demand Valve |
| MSDT | Master SCUBA Diver Trainer (PADI) |
| 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. |
| SCUBA | Self Contained Underwater Breathing Aparatus |
| PG | Pressure Group |
| NI | National Instructor (BSAC) |
| OW | Open Water Certification; First Certification Level. |
| HSE | Health And Safety Executive |
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