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To change any of these options, press MENU DOWN until CHART SETUP
appears, then press UP ARROW. Use the MENU keys to cycle through the
list and display the desired menu, then use the ARROW keys to select
the desired number size or turn the numbers off. Press the PWR key to
clear the menus.
Menus for changing digital number size.
Scales The depth scale between the upper and lower limit on the right side of
the screen can be turned on or off. The default is on.