| Acronym | Meaning |
 | PPB | Peak Performance Bouyancy |
| ABT | Actual Bottom Time |
| OD | Ocean Diver (BSAC) |
| END | Equivalent Narcotic Depth |
| GPS | Global Positioing System |
| IOC | Instructor Orientation Course (PADI) |
| PDIC | Professional Diving Instructors Corporation International; Diving Instruction Organization. |
| IDC | Instructor Development Course (PADI) |
| PSI | Pounds Per Square Inch |
| MCA | Maritime And Coastguard Agency |
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