Interpreting And Adjusting The Sounder Image - Raymarine DS400 Owner's Handbook Manual

Chapter 3: Getting Started
MAIN MENU
MAIN MENU
Scroll Speed
Range
Frequency
A-Scope
GAIN MODE...
ZOOM...
TRIP RESET...
DISPLAY SET UP...
SOUNDER SET UP...
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Note: Menu items that are displayed in all caps followed by an ellipsis (GAIN
MODE..., for example) contains sub-menus. Use the trackpad keys to scroll
through the sub-menus.

3.8 Interpreting and Adjusting the Sounder Image

The DS400/500 uses sound waves to find fish and show the bottom of a lake
or sea. The transducer sends high-frequency sound waves into the water;
these sound waves strike fish, the bottom, or other objects in the water and
return as echoes. The DS400/500interprets these echoes to present an image
of the fish and bottom.
The strength of echoes is indicated by different colors. You can use this
information to determine the size of fish and the bottom structure. Other
objects in the water, such as debris and air bubbles, also return echoes; these
echoes are generally weaker than the fish or bottom echoes and produce
background noise or clutter on the display. The digital sounder provides
controls to reduce the background noise and to adjust the way in which
echoes of different strengths are displayed.
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ON
AUTOMATIC
AUTOMATIC
OFF
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AUTO FISHING
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ARROW and ENTER key-help symbols
prompting you to use Trackpad and
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ENTER keys to change this menu item.
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