Operation Manual

70 User Manual
6.6.9 Sensitivity Menu
The Sensitivity menu is accessible both from the Fish Finder Setup menu and by
pressing [ENTER] when in Fish Finder pages. All settings in the Sensitivity menu
are related to the Frequency selected.
[MENU] + "Sensitivity Menu" + [ENTER]
Frequency
1
: ONLY IN THE DUAL FREQUENCY PAGE Allows you to select the Frequency to which the
Sensitivity parameters are applied.
Gain : Allows you to control the Gain of the unit's receiver. To see more details on the
screen, increase the receiver sensitivity by selecting a higher gain percentage. If
there is too much detail or if the screen is cluttered, lowering the sensitivity may
increase the clarity of the display.
STC : Sensitivity Time Constant: it is a time varying gain curve which attenuates the sonar
receiver gain in shallow water, increasing the gain gradually as the depth increases.
This is for the purpose of filtering out surface clutter.
STC Length : If STC is Custom, it is possible to change the Length of the Sensitivity Time
Constant.
STC Strenth : If STC is Custom, it is possible to change the Strength of the Sensitivity Time
Constant.
Surf Noise Filter
2
: This function implements an advanced time varying filter that allows suppressing
the surface clutter efficiently while leaving fish targets visible.
NOTE
1
The Frequency value is only displayed: to select the desired frequency see the
previous Par. 6.6.7.
NOTE
2
Thus imposing the capability of the Fish Finder to correctly detect the weakest
echoes coming from a very deep bottom.
6.6.10 Display Setup Menu
The Display Setup Menu allows you to change the color scheme of the Fish Finder
display, adjusts the chart scrolling rate, enables or disables the White Line and
allows determining the graphical representation of fishes.
[MENU] + "Display Setup" + [ENTER]
Color Settings : Allows you to change the color scheme of the Fish Finder display. The available colors
are Blue Background, White Background, Black Background, Gray Scale and
Reversed Gray Scale.
Scrolling Speed: Adjusts the chart scrolling rate. Note that the scrolling rate is limited by the sound
speed and the depth according with the following relation: the deeper the setting, the
slower the scrolling rate. 100% is the maximum possible.
White Line : Controls how the chart plotter displays information about the bottom type (hard or
soft).
Fish Symbols : Allows determining the graphical representation of underwater suspended targets:
Echo/Echo+Icon/Echo+Icon+Depth/Echo+Depth/Icon/Icon+Depth. The Fish icons
displayed are among four different shapes depending on the size of the Target (Small,
Med, Big, Huge).
Water Temperature: Allows you to choose the Water Temperature label displayed over the echogram
between Primary and External.
6.6.11 Transducer Setup Menu
The Transducer Setup menu contains settings that does not require frequent
changes.
[MENU] + "Transducer Setup" + [ENTER]
Keel Offset : It is the transducer depth offset from the surface. This makes it possible
to measure depth from the surface instead of from the transducer's
location.
Calibrate Sound Speed : Allows calibrating the value of Sound Speed in the water, depending on the
water temperature and salinity.
Calibrate Water Speed : Allows calibrating the value of Water Speed sensor. The calibration value,
in the range between -10% to +10%, will be applied to the water speed
from the transducer.
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