Hydrographic Survey of Canada no relation museum ship
CSS Acadia is a former hydrographic surveying and oceanographic research ship of the Hydrographic Survey of Canada and its successor the Canadian Hydrographic Service.
Acadia served Canada for 56 years from 1913 to 1969, charting the coastline of almost every part of Eastern Canada including pioneering surveys of Hudson Bay. She was also twice commissioned into the Royal Canadian Navy (RCN) as HMCS Acadia, the only ship still afloat to have served the RCN in both World Wars. She is also the last remaining ship afloat that was present at the 1917 Halifax Explosion. Today she is a museum ship, designated as a National Historic Site of Canada, moored in Halifax Harbour at the Maritime Museum of the Atlantic.Museum ship
She retired from active service on November 28, 1969, and was transferred to the Bedford Institute of Oceanography (BIO) for use as a museum ship.  Acadia was declared a National Historic Site in 1976. On February 9, 1982, the BIO transferred CSS Acadia to the Maritime Museum of the Atlantic for preservation and interpretation.  She is moored at the Museum's North Wharf and opens to visitors from May to October. Acadia is known for being one of the last ships in Halifax that was home to an official ship's cat used for rodent control. Acadia is dry docked every five years to preserve her hull, formerly at the Dartmouth Marine Slips and at Halifax Shipyard in more recent years.
In the summer Acadia is joined at the Museum wharves by HMCS Sackville, operated by the Canadian Naval Memorial Trust.  The two nearly identically sized ships present a contrast in shipbuilding eras and offer an ironic comparison as Sackville is a warship which became a part-time hydrographic ship and Acadia is a hydrographic ship which became a part-time warship.
Acadia is the only known vessel still afloat to have survived the Halifax Explosion in 1917. Every year on the December 6 anniversary of the explosion, Acadia hoists the same signal flags she flew on the day of the explosion.
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