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powered off, press and hold POWER for several seconds until a continuous
chirp is heard.
Light. LIGHT controls the unit’s display backlight. With the unit powered
on, press LIGHT once to turn the backlight on “high.” Press LIGHT a second
time to turn the backlight on “low,” and a third time turns the backlight
off. The backlight is very effective for low-light and nighttime operation.
When the backlight is on, the 250DX will consume more power than with
the backlight off. This is important when using the 250DX in a portable
configuration powered by a separate battery, or when powering the unit
from a trolling motor battery.
When powering the unit from a battery such as in portable applications,
you can prolong the battery life by using the backlight at a minimum.
The three lower buttons, MENU, UP ARROW, and DOWN ARROW work
together to control the 250DX menu-controlled user functions.
Menu. MENU displays a menu on-screen
for adjustment. In normal operation,
pressing MENU repeatedly cycles through
all available menu headings. When a
menu heading displays, the full menu
appears after a short pause. A menu remains on-screen for several seconds,
and can be adjusted by using the ARROW keys. If no adjustment is made
in the allotted time, the menu disappears. If you want the menu to remain
on-screen longer press and hold MENU—the menu will remain on-screen
indefinitely. Once you release the menu button, the screen will time out.
Once a menu times out, it is still considered the active menu. Press MENU
to bring up the last menu used.
Arrow Keys. The UP ARROW and DOWN ARROW make adjustments to
menu functions. On the left side of every menu there are UP ARROW and
DOWN ARROW symbols. The symbols indicate which ARROW button has
a function in a particular situation. Either one or both ARROW buttons can
be used to adjust the menu function. A hollow ARROW symbol means the
corresponding ARROW button has no function. Pressing that button will
result in no adjustment and the “error” audible will be heard. A solid
ARROW symbol means the corresponding ARROW button can be used to
USING THE 250DX
CONTROL FUNCTIONS
Menu Heading