I have a 2013 F350 with factory navigation/SYNC. The GPS maps are often way off. Last night, I was going to a high school football game and the map showed me way off the highway, paralleling it. I did a " Find Destination " and it had no idea where to go ( lucky I did ). Is there a download to help accuracy? I just had SYNC updated but the navigation is still way off. Oh, this happens mainly on secondary roads, major highways seem to be OK.