| Acronym | Meaning |
 | MDT | Maximum Dive Time |
| SSI | Scuba Schools International; Diving Instruction Organization. |
| RYA | Royal Yachting Association |
| DSMB | Delayed Surface Marker Buoy |
| BWRAF | Buoyancy |
| OWI | Open Water Instructor (BSAC) |
| DCI | Decompression Illness |
| RNT | Residual Nitrogen Time |
| SCUHA | Self-contained Underwater Heating Apparatus (urinating In Your Wet Suit). |
| CESA | Controlled Emergency Swimming Ascent |
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