| Acronym | Meaning |
 | BC | Bouyancy Compensator |
| DCS | Decompression Sickness |
| IAND | International Association Of Nitrox Divers |
| DL | Dive Leader (BSAC) |
| GPS | Global Positioing System |
| OW | Open Water Certification; First Certification Level. |
| PSI | Pounds Per Square Inch |
| NAUI | National Association Of Underwater Instructors |
| PADI | Professional Association Of Diving Instructors |
| CCR | Closed Circuit Rebreather |
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