Before Global Positioning Systems (GPS), people had to navigate using devices like the Plus Fours Routefinder, shown below. It’s from 1920 and consisted of a collection of small scrolling maps that you’d “load” into the watch-like device before your trip. As you progressed along your route, you’d scroll the map forward to reveal your next turn, mileage, and where to stop.
![](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjc3VXEr8YcAPOmpaQFSv4iKcyE_QdH3kyph6hkocYpqxA8eY1I8OL_eCpvZZYJynEmUQTHANalMlNdlC6eiNz_zCw7pMJ5Cs1nJe6fdJmdAXAs3BlxsmqWSI20r6J0cd3K7wE8sw/s400/1403361.jpg)
Found at
Crunch Gear
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