Garmin 90 Manuale Utente

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 (

•  Practice using your Fishfinder in Simulator Mode

(

•  Use 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, 

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.

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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