USING THE 250DX
MENU FUNCTIONS
the 250DX is operated from a battery source, the voltage number can be used to determine battery life. The 250DX will operate at voltages from 10 to 20 VDC. Voltages in excess of 20 or less than 10 VDC cause the unit to power off.
Options. The Options Menu is a series of linked menu functions used initially to set your preferences. Once your preferences are selected, it is unlikely these functions need to be accessed during the normal operation of the product.
The Options menu works differently than other menu functions in that all of the
options must be cycled through in order to
return to normal operation. There are thirteen
Option menus: Contrast, Display Speed,
Battery Alarm, Bottom Black, Fish ID, Numeral
Size, Diagnostic, Units, Languages, Speed
Offset, Depth Offset, Filter and Reset. 
Contrast. The Contrast function allows the 
user to control the level of contrast of the 
LCD display. The 250DX will automatically 
adjust the display contrast to compensate for 
changing ambient temperatures; however, 
some situations may occur where manual 
adjustment will provide a higher level of contrast.
Eleven contrast settings, +5 to 
possible. The display contrast will change as 
the adjustment is made so the optimum level 
of contrast can be achieved. Use the ARROW 
buttons to highlight the desired selection. 
The 250DX will reset to the factory setting 
when the unit is powered off.
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