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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 Strength : If STC is Custom, it is possible to change the Strength of the Sensitivity Time Constant.
Surface Noise Filter (**) : This function implements an advanced time varying filter that allows suppressing the
surface clutter efficiently while leaving fish targets visible..
NOTE (*)
If the Gain Mode option is set to Auto, the Gain Offset field is active. The default Gain Offset is zero.
If the Gain Mode option is set to Manual, the Gain field is active. When switching from Automatic
to Manual mode, the Gain + Offset value is copied into the Manual Gain setting of the receiver.
NOTE (**)
Thus imposing the capability of the Fish Finder to correctly detect the weakest echoes coming from
a very deep bottom.
4.6 DISPLAY SETUP
The Display Setup menu allows you to change the Fish Finder display page appearance.
Figure 4.6 - Display Setup sub-menu
The Display Setup options are:
Color Settings : Allows you to change the color of the Fish Finder display.
Scrolling Speed(*) : Adjusts the chart scrolling rate.
White Line : Controls how the STANDARD HORIZON GPS Chart Plotters display information about the
bottom type (hard or soft). When the White Line is Off the bottom return will display as red. When
the White Line is On it can be used to determine bottom hardness.
Fish Symbols : Allows determining the graphical representation of underwater suspended targets. See below.
Echo: shown as arches (echoes)
Icon + Echo: shown as arches with the Fish icon
Icon + Echo + Depth: shown as arches with the Fish icon and relative depth values
Echo + Depth: shown depth values
Icon: shown as Fish icons without the arches
Icon + Depth: shown as Fish icons and their relative depth values (shown accordingly to
currently selected depth unit)
A-Scope : displays Sonar Echo in real time
Water Temperature: Allows you to choose the Water Temperature label displayed over the echogram between
Primary and Auxiliary.
NOTE (*)
Note that the max 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.