Eagle Electronics FISHMARK 640C - Manual (Page 49)

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Sonar Page Menu. Most of these functions are discussed in Sec. 4.
The Sonar Page has its own menu which is used for some advanced func-
tions and for setting various options. Sonar Options and other features
are discussed in Sec. 4. To access the Sonar Page menu press
MENU once.
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.
These features and options are explained in Sec. 4, but to show you how
easy this unit is to operate, the following page contains a simplified, 10-
step quick reference that will cover most fish finding situations. The
quick reference describes how the unit operates with all the sonar fea-
tures in automatic mode which are pre-set at the factory.