| Acronym | Meaning |
 | NAUI | National Association Of Underwater Instructors |
| AIC | Advanced Instructor Course (BSAC) |
| ITW | Instructor Training Workshop (BSAC) |
| AIE | Advanced Instructor Exam (BSAC) |
| RYA | Royal Yachting Association |
| BWRAF | Buoyancy |
| DCAP | Decompression Computation And Analysis Program |
| RNT | Residual Nitrogen Time |
| OW | Open Water Certification; First Certification Level. |
| ITS | Instructor Training Scheme (BSAC) |
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