If you would like to delete multiple favorites from the device at one time:
Touch Where To?
Touch Favorites or Saved
Touch menu button (three lines) in the upper left corner
Touch Delete Favorites or Delete Saved Places
Touch the location(s) you would like to delete
Touch Select All if you would like to delete all saved favorites
Touch Delete once the desired locations are selected
Repeat the above steps as needed.
The selected favorites will be deleted.