I think I have the definitive answer, and I think it proves that I am
right. The original 1612 map was in Latin - see link showing
interactive colour copy describing "Nova Virginiae Tabula" - A new map
of Virginia. All the inscriptions are in Latin. When translated into
English it is likely that only the language in the Cartouches was
altered leaving "Flu" for Flumen. I hope that this is QED.

http://images.google.co.uk/imgres?im...lr%3D%26sa%3DG

I KNOW THE LINK IS LONG BUT IT IS WORTH IT!

Robert