Fish Finder; How The Fish Finder Operates; How To Select A Display - Furuno TZT9 Operator's Manual

7.

FISH FINDER

This chapter describes the functions of the fish finder, which requires the Bottom Dis-
crimination Sounder BBDS1 or Network Sounder DFF1 or DFF3.
Many procedures in this chapter require you to select the fish finder connected to the
network in [Fish Finder Source]. This menu has the name [DFF1], [DFF3] or [BBDS1]
depending on your system. Instead of writing all menu names, we write "fish finder".
For example, "Select the [Fish Finder Source] - [fish finder] menu".
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.
7.2

How to Select a Display

Your fish finder has six display modes. These modes are single frequency, dual fre-
quency, bottom zoom, bottom lock, A-scope, and bottom discrimination (requires Bot-
tom Discrimination Sounder BBDS1 and specified transducer).
7-1