Sketch F No. 6 Showing the Proposed Site of a Beacon on Rebecca Shoal Florida Reef Northern Hemisphere and magnetic variations

and magnetic variations

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Large folding map of Mexico and Central America

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Sketch F No. 6 Showing the Proposed Site of a Beacon on Rebecca Shoal Florida Reef Northern Hemisphere and magnetic variationsChart showing the Proposed Site of a Beacon on Rebecca Shoal, Florida located between the Dry Tortugas and Cayos de Boca Grande Keys and Mangrove Key. Depth soundings, reefs, shoals, and a note by an area called "The Quicksands" that reads "an extensive and very dangerous bank." IMPORTANT NOTE: All of our United States Coast Survey (USCS), United States Coast & Geodetic Survey (USC&GS), and similar maps and charts have been professionally unfolded and