| Acronym | Meaning |
 | EFR | Emergency First Response |
 | CCR | Closed Circuit Rebreather |
 | RDP | Recreational Dive Planner |
 | DCAP | Decompression Computation And Analysis Program |
 | DV | Demand Valve |
 | SAA | Sub-Aqua Association |
 | MDT | Maximum Dive Time |
 | AIC | Advanced Instructor Course (BSAC) |
 | DM | Dive Master (PADI) |
 | MSD | Master SCUBA Diver (PADI) |