Manual Garmin Fishfinder 140 (page 7 of 32) (English)

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Fishﬁnder 90/140 Owner’s Manual 1

GETTING STARTED

To get the most out of your new Fishﬁnder:

• Before you install and use your Fishﬁnder, read and

learn the information in this manual.

• Assemble and install the hardware (page 4).

• Practice using your Fishﬁnder in simulator mode

(page 3).

• Use the Fishﬁnder (page 12).

Understanding Sonar

The transducer that you mount on your vessel sends

sound waves toward the bottom of the water in a cone-

shaped pattern. When a sound wave strikes an underwater

object (such as the bottom, a structure, or a ﬁsh), sound is

reﬂected back to the transducer. The transducer collects the

reﬂected sound waves and sends the data to the Fishﬁnder

to be processed and shown on the screen. The underwater

data is shown on the screen in the order that it is returned;

the ﬁrst returned is the ﬁrst on the screen.

Generally speaking, if the only thing between the

transducer and the bottom is water, the ﬁrst strong return

comes from the bottom directly below the transducer,

and this sets the bottom level. Weaker secondary returns

provide the detailed data. Stronger returns appear in darker

hues.

Understanding the Fishﬁnder Screen

The transducer sends a beam down to the bottom of the

water, much like the beam of a ﬂashlight. The beam starts

small near your vessel and expands as it gets to the bottom.

The Fishﬁnder screen does not display a three-dimensional

representation of the underwater environment; the screen

is in two dimensions, much like if you took a picture

of an aquarium. Only the depth of the item in the water

appears. The screen does not show you where an item is

located horizontally in the water, as shown in the following

drawings. The ﬁsh is not directly above the tree in reality,

but it might look like it is on the Fishﬁnder screen.

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Garmin Fishfinder 140 Manual

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