Ancient man used stone hills to navigate like GPS.
Prehistoric man navigated his way across England using a crude version of 'sat nav' based on stone circle markers, historians have claimed. They were able to travel between settlements with pinpoint accuracy thanks to a complex network of hilltop monuments. These covered much of southern England and Wales and included now famous landmarks such as Stonehenge and The Mount. New research suggests that they were built on a connecting grid of isosceles triangles that 'point' to the next site. Many are 100 miles or more away, but GPS co-ordinates show all are accurate to within 100 metres. This provided a simple way for ancient Britons to navigate successfully from A to B without the need for maps. According to historian and writer Tom Brooks, the findings show that Britain's Stone Age ancestors were "sophisticated engineers" and far from a barbaric race. Mr Brooks, from Honiton, Devon, studied all known prehistoric sites as part of his research. He said: 'T