AW: During the navigation announcement, the volume level of the voice announcement can be adjusted directly via the VOL “+” and “-“ sensor keys on the device front panel. Pressing the VOL “+” or “-“ sensor key invokes a pop-up screen with a volume bar. On the right side of this pop-up screen you can find an arrow button pointing down. Tipping on the arrow key opens a volume setup screen for Start- / TA- / BT- / Navi volume, for direct volume adjustment. Newly applied VOL adjustment values are saved / retained.