BMW Map Data Download.Each year, the road network changes by as much as 15%. Newly added sections of motorways, roundabouts or one-way streets continually change our choice of routes. Speed limits, street names and new points of interest are also added or have been changed.An update of the BMW digital road map allows your navigation system to reflect the latest changes in the road network, to drive more efficiently and to always find the best and most direct route to your destination. In this way you save not only time but also fuel while protecting the environment.You can install update map by USB.