W. A. “Sonny” Cockrell demonstrating an astrolabe

Marine archaeologist, W. A. "Sonny" Cockrell, demonstrates the use of an astrolabe, a 16th century navigation instrument found in one of the treasure ships sunk off Florida's coast. State Archives of Florida.

Marine archaeologist, W. A. “Sonny” Cockrell, demonstrates the use of an astrolabe. State Archives of Florida.

Marine archaeologist, W. A. “Sonny” Cockrell, demonstrates the use of an astrolabe, a 16th century navigation instrument found in one of the treasure ships sunk off Florida’s coast. State Archives of Florida.

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