| Acronym | Meaning |
 | HID | High Intensity Discharge |
| IDEA | International Diving Educators Association; Diving Instruction Organization. |
| CESA | Controlled Emergency Swimming Ascent |
| AI | Assistant Instructor (PADI) Advanced Instructor (BSAC) |
| OWI | Open Water Instructor (BSAC) |
| EAR | Expired Air Resuscitation |
| GPS | Global Positioing System |
| SAA | Sub-Aqua Association |
| CNS | Central Nervous System |
| SPG | Submerssible Pressure Guage |
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