Update...

When using the new map data set from StreetAtlas with Siberia's method, the distance countdown seems to be working correctly. Perhaps all along it was bad map data?

My only concern is... The map data I was using before, it came right from Jan's supplied Python script. So I don't see why it should be corrupted to the point of causing a program error. Perhaps inaccurate in terms of street information, but not completely corrupted.

And in all cases, when I look at the map data files in an ASCII editor, they all look fine to me.

Hmm...