| Acronym | Meaning |
 | GPS | Global Positioing System |
| MSDT | Master SCUBA Diver Trainer (PADI) |
| OW | Open Water Certification; First Certification Level. |
| AA | Assisted Ascent |
| RSTC | Recreational Scuba Training Council. Organization That Sets Basic Guidelines For Scuba Diving Agencies. |
| OW(D) | Open Water (Diver) (PADI) |
| OD | Ocean Diver (BSAC) |
| TNT | Total Nitrogen Time |
| BT | Bottom Time |
| DEMA | Diving Equipment Manufacturers Association |
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