Why is it that we can't navigate like animals do, apparently with the aid of magnetic forces? People can't even walk in a straight line for a short distance even when 'stone-cold' sober. How many of us have literally gone round in a circle thinking we were headed in a completely different direction...
I wonder what cup and ring markings on standing stones are all about. They may be navigational aids even though they don't seem terribly helpful to modern eyes. They may be symbols of some higher truth but in line with Megalithia generally it's more likely they represent something quite mundane but presumably very useful.