| Acronym | Meaning |
 | IDC | Instructor Development Course (PADI) |
| NAUI | National Association Of Underwater Instructors |
| OD | Ocean Diver (BSAC) |
| MDL | No Decompression Limit |
| GMDSS | Global Maritime Distress And Safety System |
| MOD | Maximum Operating Depth |
| SCUBA | Self Contained Underwater Breathing Aparatus |
| NASDS | National Association Of Scuba Diving Schools; Diving Instruction Organization. |
| PDIC | Professional Diving Instructors Corporation International; Diving Instruction Organization. |
| SCUDA | Self Contained Underwater Drinking Apparatus. Product That Can Be Used To Drink Underwater. |
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