All Garmin devices have the same maps inside. The devices mainly differentiate with their functionality. So if you take another Garmin model most probably you will face the same issues you found on your current device. I don't know how is in the States but for Europe Nokia maps are the best PND maps compare to those of TomTom lets say. Google Maps are also very good but you need internet traffic to use them. Occasionaly there are some local country developers who make betters PND maps compare to those of Nokia and TomTom but at a price of a lot of effort and high investment. But for the States I think you don't have a big choice regarding maps in the PNDs. I think you have to live with that. I have see that there are free Topo maps at gpsfile depot which could be usefull in different cases where Nokia maps lack of data. If that could be of any help.
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