| Acronym | Meaning |
 | MDT | Maximum Dive Time |
| AOW | Advanced Open Water |
| CMAS | Confederation Moniale Des Activities Subaquatiques |
| NITROX | Any Gas Mixture Of Nitrogen And Oxygen; Though Most Commonly Used For Oxygen Mixtures Above The Normal 21 Per Cent. |
| BHA | British Hyperbaric Association |
| PPB | Peak Performance Bouyancy |
| ROV | Remotly Operated Vehicle |
| TO | Training Officer (BSAC) |
| NI | National Instructor (BSAC) |
| RIB | Rigid-Hulled Inflatable Boat |
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