| Acronym | Meaning |
 | MCA | Maritime And Coastguard Agency |
| TO | Training Officer (BSAC) |
| IDC | Instructor Development Course (PADI) |
| BHA | British Hyperbaric Association |
| MCS | Marine Conservation Society |
| DO | Dive Officer (BSAC) |
| BSAC | British Sub-Aqua Club |
| HP | High Pressure |
| AI | Assistant Instructor (PADI) Advanced Instructor (BSAC) |
| SPG | Submerssible Pressure Guage |
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