Komorikid wrote:My belief is that the Megalithic Empire was a trading network that was used over millennia by "those in the know".
Why did the ancient navigational aids fall into dis-use?
They were BIG builders, and devoted scarce resources into constructing things that would last (how do we know - they're still here!).
Generally things are abandoned because there is no demand for them, regardless of the cost of their construction. They can be lost to use, and knowledge of how to use them, very quickly.
What event/occurrence/discovery displaced the old system of navigation?
Surely trying to anwer this gives an insight into the original value and design these artefacts had?