This file is a work of a sailor or employee of the U.S. Navy, taken or made as part of that person's official duties. As a work of the U.S. federal government, it is in the public domain in the United States.
Image taken from http://www.history.navy.mil/ac/exploration/wilkes/wilkes21.html - due to its age, and the fact that it's a product of the US government, it's public domain
File usage
The following pages on the English Wikipedia use this file (pages on other projects are not listed):