| Acronym | Meaning |
| DCAP | Decompression Computation And Analysis Program |
| MDL | No Decompression Limit |
| EFR | Emergency First Response |
| PG | Pressure Group |
| OWIC | Open Water Instructor Course (BSAC) |
| BSAC | British Sub-Aqua Club |
| MSD | Master SCUBA Diver (PADI) |
| VENTID | Vision Ears Nausea Twitiching Irritation Dizziness |
| MCA | Maritime And Coastguard Agency |
| PDIC | Professional Diving Instructors Corporation International; Diving Instruction Organization. |