How do you disable the very annoying "No Route Planned!" voice prompt that's activated anytime you adjust the volume via the remote or touchscreen (lower left corner)???\n\nThere have been two occasions where it didn't have the voice reminder because the phrase "No Route Planned!" was not shown in the lower left corner of the screen.\n\nThe only way that I know of where you can prevent the unit from announcing "No Route Planned!" anytime the volume is adjusted is: (1) plan an actual route (but the unit will announce the next turn or set of directions); or (2) have the mp3 player displayed rather than the road map.