Humminbird HELIX 9 Operation Manual page 77

Sensitivity controls how much detail is shown on the display and will adjust the sensitivity of
all sonar frequencies. Decrease the sensitivity to eliminate the clutter from the display that
Sensitivity is sometimes present in murky or muddy water. When operating in very clear water or greater
depths, increase the sensitivity to see weaker returns that may be of interest. This menu can
also be adjusted from the Side Imaging X-Press Menu (SI Sensitivity).
Adjust the Contrast setting to accent the light and dark parts of the Side Imaging data to
Contrast
provide greater definition.
Sharpness Turn on sharpness and select a filter level to sharpen the edges of the Side Imaging data.
Contour Mode controls how the water column is displayed in the Side Imaging Views. When
Contour Mode is turned off, the water column is displayed on the view. The location of a target
on the display is based on the slant range to the target.
When Contour Mode is turned on, the bottom is graphed at a constant point on the display,
Contour Mode
regardless of changes in depth. The Side Imaging beams are divided by a vertical line. The
water column is removed from the view, which allows the display to show targets at their linear
horizontal distance. The location of a target may be easier to interpret when the water column
is removed.
Contour Mode Off
The water column is displayed on the Side Imaging View. The water column is removed from the Side Imaging View.
77
Contour Mode On
Side Imaging Sonar