| Acronym | Meaning |
 | OW | Open Water Certification; First Certification Level. |
| BSAC | British Sub-Aqua Club |
| HP | High Pressure |
| AD | Adventure Diver (PADI) Advanced Diver (BSAC) |
| MCA | Maritime And Coastguard Agency |
| LAT | Lowest Astonomical Tide |
| HID | High Intensity Discharge |
| CESA | Controlled Emergency Swimming Ascent |
| SAA | Sub-Aqua Association |
| EAR | Expired Air Resuscitation |
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