BERING SEA - Coast Guard Petty Officer 3rd Class Timothy Okeson, right, and Petty Officer 3rd Class Joshua Hockom, both electronics technicians, work on the automatic identification system on board the Coast Guard Cutter Bertholf's bridge May 17, 2011. The AIS is an automated tracking system used on ships and by Vessel Traffic Services for identifying and locating vessels by electronically exchanging data with other nearby ships and VTS stations. U.S. Coast Guard photo by Petty Officer 3rd Class Charly Hengen.
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