Getting Started
To get the most out of your new Fishfinder:
•Before you install and use your Fishfinder, read the information in this manual.
•Assemble and install the hardware (page 5).
•Practice using your Fishfinder in Simulator Mode (page 4).
•Use the Fishfinder (page 14).
Understanding the Fishfinder
The Fishfinder 90 or 140 is a fully automatic sonar unit that allows you to go out on the water and find fish without having to configure a lot of settings; or, if from experience you know exactly how you want your Fishfinder screen to look and function, you can customize each setting to your specific needs.
If you have used a Fishfinder before, and you know how to interpret the sonar information on the screen, you can skip this section. If you have not used a Fishfinder before,
Fishfinder 90/140 Owner’s Manual
Getting Started
you might want to learn a bit about sonar: what it is, how it works, and what you might see on the Fishfinder 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 find the fish.
Understanding Sonar
During installation, you connect your Fishfinder 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 Fishfinder 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 flashlight beam (covering a smaller circular area at the top and angling out to a larger circular area at the bottom). These sound waves reflect off of any object that they hit, and then the waves travel back up to the transducer. These objects could be fish, branches, the bottom, or any other object that has density that is different from the water. The transducer receives the sound
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