Lowrance iWAY 250C Quick Start Manual page 10

At left, Interface Options menu with Power Key set to Standby Mode,
the unit's default setting. At right, Power Key is set to Power Off Mode,
which will completely turn the unit off.
To restore Standby Mode return to the Interface Options menu and in
the Power Key box select Standby.
Backlight
The power button also controls backlight settings. Repeatedly pressing
the power button will cycle through the backlight settings.
Emergency Shutdown
If the unit is not responding you can force it to shutdown by using the
stylus and firmly pressing the button located on the bottom of the unit.
The button is recessed in a hole on the bottom of the unit. Pressing this
will force the unit to power off.
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