| Acronym | Meaning |
 | PP | Partial Pressure |
| SCUDA | Self Contained Underwater Drinking Apparatus. Product That Can Be Used To Drink Underwater. |
| C-CARD | Scuba Diving Certification Card. |
| SI | Surface Interval |
| CMAS | Confederation Moniale Des Activities Subaquatiques |
| MCS | Marine Conservation Society |
| NITROX | Any Gas Mixture Of Nitrogen And Oxygen; Though Most Commonly Used For Oxygen Mixtures Above The Normal 21 Per Cent. |
| GMDSS | Global Maritime Distress And Safety System |
| MDL | No Decompression Limit |
| AI | Assistant Instructor (PADI) Advanced Instructor (BSAC) |
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