| Acronym | Meaning |
 | HSE | Health And Safety Executive |
| AI | Assistant Instructor (PADI) Advanced Instructor (BSAC) |
| BCD | Buoyancy Control Device |
| PP | Partial Pressure |
| BSAC | British Sub-Aqua Club |
| CCR | Closed Circuit Rebreather |
| DEMA | Diving Equipment Manufacturers Association |
| SAA | Sub-Aqua Association |
| NAUI | National Association Of Underwater Instructors |
| LAT | Lowest Astonomical Tide |
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