The Plus Fours Routefinder was designed to be worn on the wrist — relying on good old-fashioned paper maps wound around wooden rollers. The device allowed drivers to navigate around the UK, but with so few cars on the roads it never really took off.
The Plus Fours Routefinder was designed to be worn on the wrist — relying on good old-fashioned paper maps wound around wooden rollers. The device allowed drivers to navigate around the UK, but with so few cars on the roads it never really took off.
