| Acronym | Meaning |
 | ATA | Atmospheres Absolute |
| RSTC | Recreational Scuba Training Council. Organization That Sets Basic Guidelines For Scuba Diving Agencies. |
| BSAC | British Sub-Aqua Club |
| RIB | Rigid-Hulled Inflatable Boat |
| AIE | Advanced Instructor Exam (BSAC) |
| ABT | Actual Bottom Time |
| SI | Surface Interval |
| ITC | Instructor Training Course (BSAC) |
| NI | National Instructor (BSAC) |
| ITS | Instructor Training Scheme (BSAC) |
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