7-1
7. FISH FINDER (SOUNDER)
This chapter describes the functions of the built-in fish finder.
The fish finder is set up from the [Fish Finder] menu, which can be opened by the fol-
lowing two methods.
• From the Home screen, tap [Settings]→[Fish Finder].
• With the fish finder display active, open the [Layers] menu, then tap [Fish Finder
Setting].
Unless otherwise written, this manual uses the first method.
Note 1: To change the fish finder source, open the [Fish Finder] menu, tap [Fish Find-
er Source], then tap the source to use. The source can also be selected from the [Lay-
ers] menu with [Fish Finder Source].
Note 2: The names of menu items change according to the fish finder source.
7.1 How the Fish Finder Operates
The fish finder calculates the distance between its transducer and underwater objects
like fish, lake bottom or seabed. The results are shown in different colors or shades of
gray according to echo strength.
The ultrasonic waves transmitted through water move at a constant speed of approx-
imately 4800 feet (1500 meters) per second. When a sound wave "hits" an underwater
object like fish or sea bottom, part of the sound wave is reflected toward the source.
To find the depth to an object, the fish finder calculates the time difference between
the transmission of a sound wave and the time the reflected sound wave is received.
The picture displayed by the fish finder contains a series of vertical scan lines. Each
line is a "picture" of the objects under the boat. The series of pictures are put side-by-
side across the screen to show the contours of the bottom and echoes from fish. The
amount of history of objects that have moved under the boat can be less than a minute
to more than one minute depending on the picture advance speed.
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