The FE maps are hypothetical only.
because you can't prove it
Mapping every square mile of the earth's surface is not an easy task.
In all the years of cartography, there are still serious errors. Coastlines which don't match up. Islands on maps which don't exist. Cartography is a very primitive art, inaccurate to this very day. Much of it is guesswork.
Indeed, for over three hundred years California was depicted in maps as an island off the coast of the United States. Generations of supposedly intelligent men lived and died believing that they were living on an island.
If you're interested in the subject, and the difficulty of cartography, there's a good book on the subject called "How to Lie with Maps" by Mark Monmonier.