One thing I have learned over these many years of research is,
Its not always as it seams, there is always another source, and there was to much information lost by flood, fire and war, to depend on any one source.
Prime example where GME found 35, I will say again 35 historical shipwrecks, documented" everyone all historians and government said there were no shipwrecks. There is no history of there being any shipwrecks in this area,
BUT with looking at wind patterns, currents, and info from Bob Marx GME found these ships, in fact the history of the travel patter during 16,17 century in this area is totally wrong.
So I do not put much faith in records alone. Maybe a reason to be learned here.
And Again I will say it all starts with a good survey plan.