Note 464 — Chapter VI · THE FINDING OF STRANGE COASTS.
Reading edition
Footnote 464: One seventh of 18,000 is 2,571 geographical miles, equivalent to 2,963 English miles. The actual length of Columbus's first voyage, from last sight of land in the Canaries to first sight of land in the Bahamas, was according to his own dead reckoning about 3,230 geographical miles. See his journal in Navarrete, Coleccion, tom. i. pp. 6-20.