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© The Daily MailConnected by triangles: Some of the sites created by Stone Age man (below)
It's considered to be one of the more recent innovations to help the hapless traveller.

But the satnav system may not be as modern as we think.

According to a new theory, prehistoric man navigated his way across England using a similar system based on stone circles and other markers.

The complex network of stones, hill forts and earthworks allowed travellers to trek hundreds of miles with 'pinpoint accuracy' more than 5,000 years ago, amateur historian Tom Brooks says. The grid covered much of southern England and Wales and included landmarks such as Stonehenge and Silbury Hill, claims Mr Brooks, a retired marketing executive of Honiton, Devon.

prehistoric man
© David Ace
He analysed 1,500 prehistoric sites in England and Wales and was able to connect all of them to at least two other sites using isosceles triangles - these are triangles with two sides the same length.

This, he says, is proof that the landmarks were deliberately created as navigational aides. Many were built within sight of each other and provided a simple way to get from A to B.

For more complex journeys, they would have broken up the route into a series of easy to navigate steps.

Anyone starting at Silbury Hill in Wiltshire, for instance, could have used the grid to get to Lanyon Quoit in Cornwall without a map.

Mr Brooks added: 'The sides of some of the triangles are over 100 miles across, yet the distances are accurate to within 100 metres. You cannot do that by chance.

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© SWINSOne of the monuments was on Silbury Hill, Wiltshire. It was part of a giant geometric grid used for navigating
'So advanced, sophisticated and accurate is the geometrical surveying now discovered, that we must review fundamentally the perception of our Stone Age forebears as primitive, or conclude that they received some form of external guidance.'

On the question of 'external guidance', he does not rule out extraterrestrial help.

However, Mike Pitts, editor of British Archaeology, said: 'The landscape of southern Britain was intensively settled and there are many earth works and archaeological finds. It is very easy to find patterns in the landscape, but it doesn't mean that they are real.'