Humminbird 586C Operation Manual page 22

Depth
Zoomed View
Zoom Level
Views
Sonar Zoom View
Digital depth is displayed in the upper left hand corner.
The digital readouts in the Sonar Zoom View cannot be
customized; therefore, information such as water
temperature and voltage are unavailable in the Sonar
Zoom View.
14
Upper Depth Range,
Full Range View
Upper Depth Range,
Zoom View
Full Range View
Zoom Preview Box
Lower Depth Range,
Zoom View
Lower Depth Range,
Full Range View