Built in 1960, at Appledore, England as the Island Mariner for Island Tug and Barge Limited of Vancouver, British Columbia. A subsidy of McAllister Towing Limited Montreal of Montreal.
In 1969, Island Tug and Barge Limited was acquired by Genstar Limited of Vancouver, British Columbia. Where the tug initially retained her name.
In 1973, Genstar Limited became Seaspan Marine Incorporated of Vancouver, British Columbia. Where the tug was renamed as the Seaspan Mariner. The tug is no longer in documentation. Her current and, or final, disposition is unknown.