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Coast Guard maintains maritime navigation network

from US Department of Defense

In addition to coastal defense and maritime law enforcement, one of the Coast Guard’s many responsibilities is to maintain the nationwide network of maritime navigational aids. These aids to navigation, or ATONs, include about 50,000 lighthouses, beacons and buoys marking more than 25,000 miles of navigable channels and 95,000 miles of shoreline in the U.S. and its territories, according to Coast Guard figures. Some of these aids are brand new (more are added all the time), while others — like the Alcatraz Light in San Francisco Bay — are more than 100 years old. more

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