AW: Mainly to give the customer a choice, depending on the usage profile. Depending on personal requirements and frequency of use, it may be sufficient to use the smartphone’s own map service app via Easy Connect function (Google Maps or iOS Maps are suitable). The smartphone Apps may offer a route guidance good enough to cover sporadic use. For customers seeking a more professional navigation system offering a wealth of comfort functions, the Z-N426-SDFEU navigation package is the inevitable choice, since it was specifically developed for the Z-N426 device.