Humminbird 561 Fish Finder User Manual


 
What’s on the Sonar Display
Bottom Presentation
As the boat moves, the unit charts the changes in depth on the display to create
a profile of the Bottom Contour. The type of bottom can be determined from
the return charted on the display. A Hard Bottom such as compacted sediment
or flat rock appears as a thinner line across the display. A Soft Bottom such as
mud or sand appears as a thicker line across the display. Rocky Bottoms have
a broken, random appearance.
The sonar returns from the bottom, structure, and fish can be represented as
Inverse, Structure ID®, WhiteLine™, or Black (Bottom Black). See Sonar
X-Press Menu: Bottom View to set the Bottom View.
Bottom Contour Profile with RTS Window
HardBottom
RockyBottom
Soft Bottom
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