Underwater divers may swim in waters with limited visibility. Commercial divers may operate at depths where sunlight does not penetrate.
Sonar images could be presented on a organic led emitting diode screen which replaces the diver's normal mask. The proposed mask covers the entire view of the diver. If the diver switches off the sonar, the visor is transparent.
Graphics could be added to the much like an aircraft head up display. Critical information such as air supply or directions could be presented to the diver. If the system included and inertial navigation unit, it could significantly increase the safety of cave-diving.