| Acronym | Meaning |
 | OW | Open Water Certification; First Certification Level. |
| BFK | Big F*cking Knife (reference To The Diver's Knife) |
| C-CARD | Scuba Diving Certification Card. |
| CAGE | Cerebral Arterial Gas Embolism |
| CNS | Central Nervous System |
| OD | Ocean Diver (BSAC) |
| AA | Assisted Ascent |
| RYA | Royal Yachting Association |
| GPS | Global Positioing System |
| MOD | Maximum Operating Depth |
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