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Ok, that's what I suspected, thank you.  Limited street routing, i.e., main highways, is available with the built in basemap, but apparently one needs MapSource City Navigator for the detail?  If so, could I combine that on the same chip with the Topo?

I just loaded "Washington 24k Topo" and "Northwest Trails" onto my 60csx and they work great!
Then, I used Mapinstall again to write a chip that also includes "Ibycus USA" (Washington State area) but it didn't seem to add anything.. no new information, no more detailed street routing.  Ibycus USA does show, with all boxes checked, in my maps setup.  What am I missing?