Guy Bernardin set off with his wife and small son in a Spray replica to retrace Slocum's voyage.
They didn't follow exactly because someone had dug a canal in the meantime.
Anyway, Guy discovered his Spray had the same uncanny ability to maintain course for days on end with no help from him.
His book, Sailing Around the World, was published by Sheridan House in 2002 (English language version).
BTW, Slocum was an extraordinary navigator and seaman.