On the volvo system it's a separate part ...
I want to do something like this...
http://forums.swedespeed.com/zerothread?id=127880
though a few people on swedespeed have installed monitors (see post few above this one ) and then connected a garmin GVN53 to provide the black box sat nav.
See here
http://translate.googleusercontent.c...PLHRD8-AoGDSOg
but there is also an all in one option from far east with a touchscreen sat nav built in screen. This looks quite promising as in theory the install would be very simple (no connections other than switched power).
see here ...
http://www.cheledigital.com.cn/produ...olvo_XC90.html
or
http://forums.swedespeed.com/zerothr...=113238&page=5