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Fishnder 90/140 Owner’s Manual 1
Getting Started
Getting Started
To get the most out of your new Fishnder:
Before you install and use your Fishnder, read the
information in this manual.
Assemble and install the hardware (page 5).
Practice using your Fishnder in Simulator Mode
(page 4).
Use the Fishnder (page 14).
Understanding the Fishnder
The Fishnder 90 or 140 is a fully automatic sonar unit
that allows you to go out on the water and nd sh without
having to congure a lot of settings; or, if from experience
you know exactly how you want your Fishnder screen to
look and function, you can customize each setting to your
specic needs.
If you have used a Fishnder before, and you know how
to interpret the sonar information on the screen, you can
skip this section. If you have not used a Fishnder before,
you might want to learn a bit about sonar: what it is, how it
works, and what you might see on the Fishnder 90 or 140
screen. This manual does not go into technical detail about
sonar, but it can give you a general understanding of those
things that you need to know about sonar that can help you
interpret the screen and nd the sh.
Understanding Sonar
During installation, you connect your Fishnder 90 or 140
to a transducer. The transducer uses sound to determine
information about what is in the water beneath your boat.
Then the transducer sends the information to your Fishnder
to be displayed on the screen for you to view and interpret.
The transducer sends sound waves down into the water
in a cone shape, similar to a ashlight beam (covering a
smaller circular area at the top and angling out to a larger
circular area at the bottom). These sound waves reect off
of any object that they hit, and then the waves travel back
up to the transducer. These objects could be sh, branches,
the bottom, or any other object that has density that is
different from the water. The transducer receives the sound
190-00582-10_0A.indd 1 12/2/2011 3:08:55 PM
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