A funny story from our visit today to the Heimatmuseum in Waldgirmes, near Wetzlar, Germany. The museum’s director showed us a shoe made in the late 1800s by a local farmer/shoemaker. He placed the studs in a certain way so that he could track his daughter’s movements around the village. (Which back then had dirt streets, like all German villages and small towns)
It was an early form of a GPS system.