Eagle FishElite 640c Installation And Operation Instructions Manual page 56

You can customize how the Sonar Page displays its pictures and other
data in many ways. Your unit also includes several special sonar features
and options that can help you better interpret the underwater scene.
We will discuss all of those features and options in Sec. 4, but to show
you how easy this unit is to operate, the following page contains a, 10-
step quick reference that will cover most fish finding situations. The
quick reference describes how your unit will operate with all sonar fea-
tures set to default settings.
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