Wednesday, July 28, 2010

The Plus Fours Routefinder

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.

Found at Crunch Gear

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