| Acronym | Meaning |
 | OWI | Open Water Instructor (BSAC) |
| MCS | Marine Conservation Society |
| GMDSS | Global Maritime Distress And Safety System |
| PADI | Professional Association Of Diving Instructors |
| DL | Dive Leader (BSAC) |
| OW(D) | Open Water (Diver) (PADI) |
| RD | Rescue Diver (PADI) |
| NAUI | National Association Of Underwater Instructors |
| MSD | Master SCUBA Diver (PADI) |
| IDEA | International Diving Educators Association; Diving Instruction Organization. |
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