pretty good. At least mine do. Once you get south of the boarder, not so much. I understand that some chart programs have better accuracy now then others and I haven't upgraded mine in a while so I can't bitch. When I went up the Napa River to Napa Valley a few years ago I was really surprised how accurate the plotter was. Too much time in Mexico I suppose. I'm with you though. I use the Radar for navigation as much as for collision avoidance.