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Railways are good navigation references. Even after a hundred years of disuse, all tracks having been removed, you can still see the outlines. Same with abandoned WW2 airfields in East Anglia. It all depends: in the middle of the Sahara, even a cameltrack would be valuable navigation information. I prefer to have railway tracks, waterways and highways. That said I don't use SD to simulate a topographical map, I use the GPS part to help my navigation along airways or VFR routes around or through controlled airspace. In VFR we should watch for traffic, navigation is secondary. I only watch the SD screen maybe a few seconds every few minutes, depending on the distance to next waypoint. I have encountered too many aircraft that showed no sign of ever seeing me.
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