Miami in Miami-Dade County, Florida — The American South (South Atlantic)

Coast Survey Base Marker

Photographed by Tim Fillmon, February 7, 2025

1. Coast Survey Base Marker Marker

Inscription.
The Key Biscayne North Base Marker was placed here in April of 1855 by the U.S. Coast survey team, under the direction of Alexander Dallas Bache, the great-grandson of Benjamin Franklin and Superintendent of the Coast Survey. The survey was done by triangulation, a mathematical system using triangles to compute various distances from a few measured lengths, known as bases. Using these bases the coast of South Florida was mapped for navigational purposes. This marker, at the north end of the Key Biscayne base, is located 3.597 miles from the south marker, which is located approximately 300 feet southeast of Cape Florida Lighthouse.

Erected by Eastern Airlines in cooperation with Historical Association of South Florida.

Topics. This historical marker is listed in this topic list: Landmarks. A significant historical month for this entry is April 1855.

Location. 25° 43.065′ N, 80° 9.497′ W. Marker is in Miami, Florida, in Miami-Dade County. It can be reached from Crandon Boulevard 1½ miles north of Ocean Lane Drive. Marker is located on the Crandon Golf Course near the 10th hole along the cart path. Touch for map. Marker is at or near this postal address: 6700 Crandon Blvd, Key Biscayne FL 33149, United States of America. Touch for directions.

Regionally, this marker is in South Florida

and on the Gold Coast.

It is also in the American South.

Globally, it is in the North Atlantic Region,

North America,

a Gulf of Mexico state,

the Western Hemisphere,

the Western World,

and the Anglosphere.

Historically, it finds itself in what was once New Spain,

the territory of the Mississippian Culture,

one of the Confederate States of America,

and the Antebellum South.

Other nearby markers. At least 8 other markers are within 4 miles of this marker, measured as the crow flies

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: Virginia Key Beach Park (approx. 1.2 miles away); Historical Marker #2 Dance Pavilion (approx. 1.2 miles away); The Concession Stand (approx. 1.2 miles away); U.S. Coast Survey Base Marker (approx. 3 miles away); Cause for Conservation (approx. 3½ miles away); Road to Restoration (approx. 3½ miles away); Restoration Hardware (approx. 3½ miles away); Dade Heritage Trust’s Cape Florida Lighthouse Brick Program (approx. 3½ miles away). Touch for a list and map of all markers in Miami.

Photographed by Tim Fillmon, February 7, 2025

2. Coast Survey Base Marker Marker

Coast Survey Base Monument image. Click for full size.

Photographed by Tim Fillmon, February 7, 2025

3. Coast Survey Base Monument

Coast Survey Base Marker Monument image. Click for full size.

Photographed by Tim Fillmon, February 7, 2025

4. Coast Survey Base Marker Monument

Credits. This page was last revised on February 19, 2025. It was originally submitted on February 18, 2025, by Tim Fillmon of Webster, Florida. This page has been viewed 168 times since then and 25 times this year. Photos: 1. submitted on February 18, 2025, by Tim Fillmon of Webster, Florida. 2, 3, 4. submitted on February 19, 2025, by Tim Fillmon of Webster, Florida.