Eagle Electronics SEAFINDER 500C - Manual (Page 45)

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Turn off the unit by pressing and holding the PWR key for 3 seconds.
Main Menu
The unit has a Main Menu, which contains some function commands and
some setup option commands. The instructions in this section will deal
only with sonar functions, the basic commands that make the unit show
sonar signals on your screen. This sonar unit will work fine right out of
the box with the factory default settings. But, if you want to learn about
the various sonar options, see Sec. 4, Sonar Options & Other Features.
You can access the Main Menu from any of the four Page screens by
pressing
MENU | MENU . To clear the menu screen and return to the page
display, press EXIT . (Remember, our text style for " MENU | MENU " means
"press the Menu key twice." See a full explanation of our instruction
text formatting on pages 5, "How to use this manual…".
Main Menu.
The Main Menu commands and their functions are:
Screen command: changes the contrast or brightness of the display
screen.