Humminbird 515 - Manual (Page 28)

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User Mode (Normal or Advanced) - An Advanced Mode is provided for users
who desire the highest level of control over the Fishfinder and Normal Mode for
users who desire greater simplicity and fewer menu choices. Additional
Advanced menu choices will be displayed throughout the menu system when
you navigate to specific menus while in Advanced Mode. Any changes made
while in Advanced Mode will remain in effect after you switch back to Normal
Mode. See Setup Menu Tab: User Mode for specific instructions on changing
to Advanced User Mode.
Total Screen Update - when you change any menu settings that affect the
Sonar View, the view will update immediately (i.e. you don’t have to exit the
menu to apply the change to the screen).
Sonar Tab,
Normal Mode
Sonar Tab,
Advanced Mode