This article raises the basic question the GH,Menzies,Hapgood and many others have used as the basis for their various theories,speculation, and books.

The existence of these charts and their stiking accuracy. That when the supposed authors were squirreled away miles from the sea and with limited tools. Implied is a knowledge set very large and expansive that the context does not support. The who,what,why,where,when.