That map of the Florida/ Georgia coast appears bogus.
There was no known longitudes for North America until the invention of the chronometer. Your map shows longitude lines
Dear noob,
the map is not “bogus.
It is overlain with modern points of identification for clarity.
If you look closely, it is also overlain with the locations of current day
Hilton Head, Tybee, Sapelo, St. Simons, Jekyll, Cumberland, and Amelia Islands.
That’s as good or better as some of my screw-ups.