The Daily Mail:
They are supposed to make getting around easier.
But over-reliance on sat-navs could leave us completely lost, a study has suggested.
Scientists think our memory for places is like a mental map which we have learnt from looking at a real map of where we live.
Researchers from the Max Planck Institute for Biological Cybernetics in Germany tested 26 residents of a town, all of whom had lived there for at least two years.
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