DM: Dive Master
DMAC: Diving Medical Advisory Committee
DO: Dive Officer
do: Diving Officer
do: dysbaric osteonecrosis
DPV: Diver Propulsion Vehicle
DSEA: Davis Submerged Escape Apparatus
DSMB: Delayed Surface Marker Bouy
DSMB: Delayed Surface Marker Buoy
DUI: Diving Unlimited International
DV: Demand Valve
DWR: Diving at Work Regulations
DWR97: Diving at Work Regulations 1997
EAD: Effective Air Depth
EAD: Equivalent Air Depth
EAN: Enriched Air Nitrox
EANx: Enriched Air Nitrox
EAR: Expired Air Resuscitation
EATD: European Association of Technical Divers
EAV: Expired Air Ventilation
EBS: Emergency Breathing System
ECC: external cardiac compression
ECU: Environmental Control Unit
EFR: Emergency First Response
END: Equivalent Narcotic Depth
EO: Equipment Officer
FAUI: Federation of Australian Underwater Instructors
FFA: Feet First Ascent
FFM: Full Face Mask
ffw: feet of fresh water
FGV: Free Gas Volume
fHe: Fraction of Helium
fN2: Fraction of Nitrogen
fO2: Fraction of Oxygen
FPS: Foot, Pound, Second
FSW: feet of salt water
fsw: feet of seawater
FV: Floodable Volume
GMDSS: Global Maritime Distress and Safety System
GPS: Global Positioning System