[hackney]

Interesting. The post references sources such as Mapzen which allows you to extract portions of data for peculiar needs. Mapzen also provides an api for turn by turn navigation and there is a plugin to use it on a web based map. I use DeLorme's street atlas on my tablet. It works great and is inexpensive. Just don't bother with any map pack additions as when you try to download more than a few square miles, delorme then promptly throttles you to 1990 dialup speeds. Viking (sourceforge) is also an option but there is no real time gps with windows.