I would bet that his has been discussed a few times but I could not find a thread that talked about it recently. My problem is that I just bought a Dakota 20 with the My Topo 100k maps. After I downloaded the maps and was playing around with them I am consistently not on the road that is showing on the map. For example, I live at the end of a street that I can planely see on my map but it shows my position as on the street to the west of where my house is. If I drag the push pin to where my house would be on the map I am about 430 feet off the correct position. I hope I am making sense. I am admittedly not very tech savy and I am new to the gps but I would think these maps would be better than that. Thanks in advance for any info, Greg.