What's On The Down Imaging® Display - Humminbird 688ci HD DI Operation Manual

What's on the Down Imaging® Display
Down Imaging® uses its unique transducer and sonar technology to provide
profiling beams produce the detailed sonar data that you see on the display.
interpret the structure and bottom contour, including the following items:
Depth - Water depth can be set to alarm when
the water becomes too shallow.
Temperature - Water surface temperature.
Structure
BottomReturn-Usetheappearanceofthebottom
return to determine bottom hardness. Rock and
gravel provide a clearer sonar return than
mud and sand because hard objects reflect
sonar better than soft objects.
Speed - If a GPS Receiver or Temp/Speed
accessory is connected, the Fishfinder can
display the speed of the boat and can keep a
Triplog of nautical or statute miles traveled.
NOTE: Entries in this view that list (with Temp/Speed or GPS Receiver) are available if
then only the information from the GPS receiver will be displayed on the view.
What's on the Down Imaging® Display 26