Garmin 340c Manuale Utente

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The strongest sonar returns appear on your screen as the most 

intense solid color (depending on your selected color scheme; red 

is the default). The weakest returns appear as the less intense, less 

solid colors (blue is the default). 
The bottom of the water is always going to be the strongest 

signal, and therefore the most intense color. The bottom is the 

continuous, intensely-colored line running across the bottom of 

the screen. The Fishfinder 340C includes the latest technology in 

interpreting bottom signals; it can see through fish, structures, and 

thermoclines (shown in the weakest colors). Large schools of fish 

or dense structures close to the bottom can affect water depth return 

readings.

  NOTE: If the Fishfinder is unable to track the bottom for any 

reason, the digits which indicate depth flash on and off to alert 

you that the Fishfinder is not tracking the bottom.

Along the top of the screen, you might see a grouping of intense 

colors. This area is surface clutter, which can be caused by waves 

or any other sonar interference at the surface of the water. Too 

much surface clutter can obscure your view of fish. You can turn 

down the Gain setting to reduce this surface clutter.
Between the bottom and the surface clutter, you see suspended 

targets in the previous illustration. Here, the targets appear as 

arches. Actual suspended target returns might not always appear 

as perfect arches, due to the speed, fish orientation, or other 

conditions. You can turn on the Fish Symbols setting if you want to 

see suspended targets indicated by a fish shape. 
The strength of the sonar return can also help you interpret the 

hardness of the bottom of the water. The thicker the bottom line, 

the harder the bottom.