| Acronym | Meaning |
 | RIB | Rigid-Hulled Inflatable Boat |
| BSAC | British Sub-Aqua Club |
| NI | National Instructor (BSAC) |
| TDT | Total Dive Time |
| PPB | Peak Performance Bouyancy |
| EFR | Emergency First Response |
| AD | Adventure Diver (PADI) Advanced Diver (BSAC) |
| CNS | Central Nervous System |
| AAS | Alternate Air Source |
| OWIC | Open Water Instructor Course (BSAC) |
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