B&G Zeus 12 - Manual (Page 47)

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Optimizing the Echosounder Image
Several parameters can be adjusted to
optimize the sounder image.
Gain
The gain controls the sensitivity of the
echosounder.
The more you increase the gain, the
more details will be shown on the
image. However, a higher gain setting
may introduce more background clutter
on the image. Conversely, if the gain
is set too low weak echoes may not be
displayed.
Auto gain
The Auto gain option will keep the sensitivity at a level that works well under most
conditions.
With the gain in auto mode, you can set a positive or negative offset that gets applied to
the auto gain. This is indicated as A-40 - A40.
Color
The strength of the echo is symbolized by colors. A strong return will be shown with
reddish-brown color, while a weak signal will be light blue (depending on which palette
you select).
The more you increase the Color, the more echoes will be displayed as reddish-brown.
Adjusting the Gain and Color gain settings
Gain and Color are adjustable by using the rotary knob.
You select between Gain and Color by pressing the rotary knob. The active control will
expand and display it’s name in full. You can then adjust the value by turning the knob.
If you press and hold the rotary knob when Gain is selected, you switch between Auto
and Manual gain option.
PLOT GO TO
MARK VESSEL
If no adjustments are made within 3 seconds the controls will return to default size.
Noise rejection
Echosounder signal interference from bilge pumps, engine vibration and air bubbles can
clutter the sounder image.
The noise rejection option filters the impact of echosounder signal interference by
reducing the on-screen clutter.