I guess I spoke a little too soon about CN. Actually in addition to CN I also use Topo 100k, Topo24k, and Benchmark, GTR, and BLM paper maps to plan serious off-pavement trips.
BaseCamp is much better than Mapsource in not having to zoom in and out so much.
The Benchmark maps are just about perfect for getting the big picture, seeing terrain, and still being able to see virtually every road no matter how small. And these maps show a bigger variety of road types than digital maps. It is pretty easy to look at a Benchmark map and then draw the route in BaseCamp or Mapsource especially in the winter time.
I use BLM maps to determine land ownership in questionable areas.