| Acronym | Meaning |
 | AD | Adventure Diver (PADI) Advanced Diver (BSAC) |
| RYA | Royal Yachting Association |
| IAND | International Association Of Nitrox Divers |
| DL | Dive Leader (BSAC) |
| RDP | Recreational Dive Planner |
| AIE | Advanced Instructor Exam (BSAC) |
| MDL | No Decompression Limit |
| ADT | Actual Dive Time |
| DM | Dive Master (PADI) |
| GPS | Global Positioing System |
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