| Acronym | Meaning |
 | MCA | Maritime And Coastguard Agency |
| HID | High Intensity Discharge |
| NITROX | Any Gas Mixture Of Nitrogen And Oxygen; Though Most Commonly Used For Oxygen Mixtures Above The Normal 21 Per Cent. |
| OW | Open Water Certification; First Certification Level. |
| EAR | Expired Air Resuscitation |
| SCUBA | Self Contained Underwater Breathing Aparatus |
| AD | Adventure Diver (PADI) Advanced Diver (BSAC) |
| BHA | British Hyperbaric Association |
| LAT | Lowest Astonomical Tide |
| DM | Dive Master (PADI) |
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