pwave - I looked into that idea A LOT when I was trying to integrate some track tools into my car. the issues for me were external gps and video connectivity. plus the android mirror is just kind of a stick-on thing (ie, ugly).
other cool options are:
https://itunes.apple.com/ca/app/hudway-gps-navigation-head/id673146260?mt=8
and
https://www.navdy.com/
but they just do nav (proprietary) not track stuff.