| Acronym | Meaning |
 | MSDT | Master SCUBA Diver Trainer (PADI) |
| DO | Dive Officer (BSAC) |
| MCS | Marine Conservation Society |
| OD | Ocean Diver (BSAC) |
| TNT | Total Nitrogen Time |
| AAS | Alternate Air Source |
| SCUHA | Self-contained Underwater Heating Apparatus (urinating In Your Wet Suit). |
| RSTC | Recreational Scuba Training Council. Organization That Sets Basic Guidelines For Scuba Diving Agencies. |
| CMAS | Confederation Moniale Des Activities Subaquatiques |
| ITS | Instructor Training Scheme (BSAC) |
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