| Acronym | Meaning |
 | DCAP | Decompression Computation And Analysis Program |
| TO | Training Officer (BSAC) |
| SI | Surface Interval |
| EAR | Expired Air Resuscitation |
| BSAC | British Sub-Aqua Club |
| RDP | Recreational Dive Planner |
| IDEA | International Diving Educators Association; Diving Instruction Organization. |
| AD | Adventure Diver (PADI) Advanced Diver (BSAC) |
| PDIC | Professional Diving Instructors Corporation International; Diving Instruction Organization. |
| LAT | Lowest Astonomical Tide |
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