| Acronym | Meaning |
 | LAT | Lowest Astonomical Tide |
| AAS | Alternate Air Source |
| CNS | Central Nervous System |
| OWI | Open Water Instructor (BSAC) |
| HPNS | High Pressure Nervous Syndrome |
| SCUBA | Self Contained Underwater Breathing Aparatus |
| AI | Assistant Instructor (PADI) Advanced Instructor (BSAC) |
| MCA | Maritime And Coastguard Agency |
| PG | Pressure Group |
| MSD | Master SCUBA Diver (PADI) |
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