| Acronym | Meaning |
 | OWI | Open Water Instructor (BSAC) |
| OWSI | Open Water SCUBA Instructor (PADI) |
| SAR | Search And Rescue/Recovery |
| NITROX | Any Gas Mixture Of Nitrogen And Oxygen; Though Most Commonly Used For Oxygen Mixtures Above The Normal 21 Per Cent. |
| RD | Rescue Diver (PADI) |
| RYA | Royal Yachting Association |
| BCD | Buoyancy Control Device |
| ROV | Remotly Operated Vehicle |
| DAN | Divers Alert Network |
| SSI | Scuba Schools International; Diving Instruction Organization. |
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