Garmin 340c Manuale Utente

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The Fishfinder 340C is a fully automatic, color sonar unit that 

allows you to go out on the water and find fish without having 

to configure a lot of settings. However, you can customize each 

setting as you prefer.
If you have used a Fishfinder before, you might already know how 

to interpret the sonar information on the screen, so 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 340C screen. This manual provides 

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 340C 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 shown 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 

wave information, and then sends the information to the Fishfinder. 

The Fishfinder shows the information on the screen for you to see 

and interpret. The type of transducer and settings that you choose 

determine how the information appears on the screen.

Dual frequency works best for deep water (for example, off-shore) 

applications. The 200 kHz frequency allows you access to great 

detail about what is underneath your boat. The 50 kHz frequency 

provides less detailed information, but penetrates to greater depths 

with the same power. You can choose either or both frequencies to 

get the information that you want. If you choose dual frequency, 

the transducer alternates between the 50 kHz and 200 kHz signals. 

This capability allows you to see the best picture available at any 

depth.