How the satnav became a million dollar idea

Satnavs are the magic, moving maps pinned to our windscreens that can guide us on any road journey in the world – all thanks to an array of satellites in space. But who first came up with them, and what kind of in-car navigation gadgets did people try out before satellite technology came along? Aaron Heslehurst has the story.

Script and video: Jeremy Howell

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