Built in 1998, by Marco Shipbuilding Incorporated of Seattle, Washington (hull #478) as the Delta Carey for Bay and Delta Maritime Services Incorporated of San Francisco, California.
In 2005, the tug was chartered by the Foss Maritime Company of Seattle, Washington. Where she was renamed as the Pacific Explorer.
In 2013, she was acquired by the Amak Towing Company Incorporated of Ketchikan, Alaska. Where the tug was renamed as the Anna T.
Powered by two, Caterpillar 3516 B diesel engines. With Aquamaster 2001/3325 z drive units. For a rated 4,400 horsepower.
The tug's electrical service is provided by two, 105kW generators. Driven by two, Caterpillar 3304 diesel engines.
Her towing gear consists of a winch on her bow, outfitted with 480(ft) of 8(in) plasma line. And a double drum towing winch, on her stern. Outfitted with 2,400(ft) of 2(in) wire rope. As well as a three pin hydraulic system, with hold down.