Chapter 6: Sonar Mode Operation
6-7
The automatic gain modes finds the ideal sensitivity level for you,
based on depth and water conditions. Automatic gain modes take
advantage the hardware’s advanced DSP technology. As a result,
the sounder typically achieves a sharper image in any of the auto-
matic gain modes than is possible in manual mode.
The DSM250 provides three pre-defined automatic gain settings:
CRUISING
is the lowest automatic gain setting. It is ideal for view-
ing sonar image with a minimum of background noise as you are
travelling to your fishing spot.
TROLLING
is a slightly higher gain setting that displays more
detailed echos as you search for targets.
FISHING
is the highest automatic gain setting. It gives the best
details of the targets you have located but also displays the most
background noise and surface clutter.
Note:
The automatic gain modes are named so as to suggest when
you might use them. However, it is not necessary for you to select, for
example, Fishing Mode only when you are fishing. You may want to
take advantage of Fishing Mode’s higher gain even when cruising at
high speeds. Your personal preference should determine which auto-
matic gain mode you use, not necessarily your boat speed.
Color Gain
The
COLOR GAIN
determines how echoes of different strengths are
displayed. Three shades of gray (monochrome display) or seven
colors (color LCD) per palette are available and the echo strengths
are divided into three (monochrome) or seven (color) bands to
correspond with each shade of gray/color.
The color bar on the right hand side of the display, when set to
ON
in the Sonar Set Up menu (see
Section 4.4
), shows the colors
being used, with strongest echo color at the top and the weakest
echo color at the bottom.
The
COLOR GAIN
control sets the lower limit for the top color
band:
All echoes with a signal strength above this value are displayed in
the strongest shade/color.
All echoes weaker than this value are divided equally between the
remaining shades/colors.
CRUISING
AUTO
45%
MULTI
GAIN
MANUAL
CLR GAIN
50%
Содержание DSM250
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