Eagle Electronics SeaFinder 480DF - Manual (Page 44)

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Sonar chart display options (from left) split zoom (all models)
and split frequency (SeaFinder 320DF only).
Digital data sonar chart display option.
You can customize how the Sonar Page pictures and other data are
displayed in many ways. We'll discuss all of those features and options in
Section 4, but to show you how easy the sonar unit is to operate, see the
following 10-step quick reference that will cover most fish finding situations.
The quick reference describes how your unit will operate with all the sonar
features in their automatic modes, which are set at the factory.