| Acronym | Meaning |
 | NI | National Instructor (BSAC) |
| GMDSS | Global Maritime Distress And Safety System |
| END | Equivalent Narcotic Depth |
| SCUDA | Self Contained Underwater Drinking Apparatus. Product That Can Be Used To Drink Underwater. |
| ABT | Actual Bottom Time |
| CAGE | Cerebral Arterial Gas Embolism |
| PDIC | Professional Diving Instructors Corporation International; Diving Instruction Organization. |
| OWI | Open Water Instructor (BSAC) |
| ITS | Instructor Training Scheme (BSAC) |
| EAN(X) | Enriched Air Nitrox |
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