Humminbird 561 - Manual (Page 65)

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Setup Menu Tab
From any view, press the MENU key twice to
access the tabbed Main Menu, then press the
RIGHT Cursor key until the Setup tab is selected.
NOTE: Menu options will vary depending on which
accessories are attached to the unit.
NOTE: Menu options can be expanded or simplified by
setting the User Mode to Advanced or Normal. See Main
Menu: User Mode for details.
Setup Menu Tab
Setup Menu Tab