You got to have both accurate GPS receiver and maps in order to get accurate positions and directions. I believe that the GPS hardware works fine, the maps that come with it is grossly inaccurate. I drove around my neighborhood, it showed that I was driving way off road over other people's houses in certain sections of the road.The user manual does not list MS Streets and Trips as one of the support maps. I guess I will have to live with the DeLorme's own.