| Acronym | Meaning |
 | TO | Training Officer (BSAC) |
| GPS | Global Positioing System |
| MOD | Maximum Operating Depth |
| EFR | Emergency First Response |
| OWIC | Open Water Instructor Course (BSAC) |
| RYA | Royal Yachting Association |
| BHA | British Hyperbaric Association |
| SCUBA | Self Contained Underwater Breathing Aparatus |
| IAND | International Association Of Nitrox Divers |
| PADI | Professional Association Of Diving Instructors |
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