New Wristwatch Style GPS Route Indicator

New Wristwatch Style GPS Route Indicator

The driver winds the knobs to move the map on as their car travels further

They are notorious for guiding exasperated motorists down footpaths, into ponds or to the wrong city entirely.

But the modern-day sat-nav is likely to pose far fewer problems for lost drivers than its 1927 forerunner.

The Plus Four Wristlet Route Indicator, which has gone on display at a National Trust house, is thought to be the first navigation device for motorists.

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