This Touch screen Car DVD navigation system for BMW has a 7 inch HD digital screen. Installing this car DVD system does not require a separate Navigation computer and wiring harness as the Original BMW Navigation system requires. The Navigation system simply plugs into the existing car wiring with minimal additional connections. It is built in GPS, FM/AM Radio, RDS, movie, Time, calendar etc. It also is compatible with DVD, VCD, CD, MP3, MPEG4, CD-R, WMA and JPEG playbacks. This car DVD player supports GPS function. And it comes with free 4 GB TF Map Card.