U.S. Coast and Geodetic Survey

First Edition Antique Nautical Chart of Key West, Florida


Preliminary Chart of Key-West Harbor and Approaches From a Trigonometrical Survey under the direction of A.D. Bache, Superintendent of the Survey of the Coast of the United States… 1851.


Detailed first-edition original antique hydrographic survey chart of the vicinity of Key West, Florida. Includes extensive sailing directions with landmarks, courses, bearings and instructions for entering Key West via several channels. This antique chart, based on a thorough trigonometrical survey, was released by the U.S. Coast Survey in 1851. Contains literally hundreds of depth soundings.

A trigonometrical survey of a portion of the earth's surface is conducted by measuring a single base distance, and connecting it with various points in the tract surveyed by a series of triangles, the angles of which are carefully measured. Relative positions and distances of all parts are computed from these data.

Includes a tide table and very interesting cross-sectional views of elevation of coral heads, (water depth) recorded across several lines on the chart at Sand Key and the reefs at the East Channel. Other noted points include Fleming's Key, Francfort Bank, East Crawfish Key, West Crawfish Key, Mangrove Keys, and Raccoon Key.

With extensive sailing directions for several approaches to Key West, Florida including: the East Channel, the Main Ship Channel ("At Night. Bring the North Stat to range after Key West Light House and stand for it when Sand Key (or Sound Key Light Boat bears S.W. by W. S. 62 degrees W) a vessel drawing over 16 feet of water had better anchor and wait for a pilot".); Rock Key Channel; Sand Key Channel; West Channel; and North West Channel.

CREATOR: U.S. Coast and Geodetic Survey



BODY OF WATER: Gulf of Mexico

CONDITION: Good.  Folds as issued, now flattened. Left margin a bit shorter at bottom left.

COLORING: Modern hand coloring.


SIZE: 14 " x 18 "




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