Found this on Bored Panda, in a round-up of cool, wacky inventions from the past. Apparently the paper-roll map advanced based on the speed of the car. But wait, what happened when you turned onto a new street? You’d have to have quite the library of map-scrolls stashed in your car, and be doing a lot of scroll-swappin’ At least the idea was pointing in the right direction.
1930s answer to GPS