It doesn't speak to you or give live traffic updates, but this is the world's first sat nav - invented in the 1920s.
The Plus Fours Routefinder was designed to be worn on the wrist - relying on good old-fashioned paper maps wound around wooden rollers, which the driver turned en route.
The tiny scrolls also showed the mileage and gave a "stop" instruction at the journey's end.
link here
The Plus Fours Routefinder was designed to be worn on the wrist - relying on good old-fashioned paper maps wound around wooden rollers, which the driver turned en route.
The tiny scrolls also showed the mileage and gave a "stop" instruction at the journey's end.
link here
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