NDrive 10 for phones - Manual (Page 9)

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Changing the Volume Level
When navigating, you can also change the volume level. If you slide your finger over the bottom of the
screen you can increase/decrease the audio level.
Changing the volume
Portrait & Landscape modes*
Changing the phone position from vertical to horizontal will change the mode of the display from Portrait
to Landscape.
*available on selected phones
Portrait Landscape