HMCS Granby was a Bangor-class minesweeper built for the Royal Canadian Navy during World War II, representing a scaled-down design modeled after the Royal Navy's Halcyon class. She displaced approximately 592 long tons (601 tonnes) at standard load and up to 690 long tons (700 tonnes) fully loaded. The vessel measured 162 feet (49.4 meters) in length, with a beam of 28 feet (8.5 meters) and a draught of 8 feet 3 inches (2.51 meters). Her size was somewhat cramped, especially after wartime additions such as ASDIC, radar, and depth charges. Granby was powered by a 9-cylinder diesel engine driving two shafts, producing 2,000 brake horsepower, which allowed for a maximum speed of 16.5 knots (30.6 km/h). She carried a fuel load of 65 long tons (66 tonnes) of oil and had a crew complement of 6 officers and 77 ratings. As a diesel-powered Bangor, her armament included a single QF 12-pounder 12 cwt gun forward, a QF 2-pounder Mark VIII aft, and later, single-mounted QF 20 mm Oerlikon guns on the bridge wings. For convoy escort duties, she was equipped with two depth charge launchers and two chutes, capable of deploying 40 depth charges. Constructed by Davie Shipbuilding and Repairing Co. Ltd. at Lauzon, Quebec, her keel was laid on December 17, 1940. She was launched on September 6, 1941, and commissioned on May 2, 1942, at Quebec City. Throughout her wartime service, Granby participated in the Battle of the Atlantic and the Battle of the St. Lawrence, initially operating with Sydney Force and later transferring to the Western Local Escort Force, including escort groups W-3 and W-24. Notably, she was part of the Canadian force that attempted to disrupt Operation Kiebitz, a German plan involving prisoner-of-war U-boat captains. Following the war, Granby was transferred to the Royal Canadian Mounted Police Marine Unit but was never commissioned into service there. Instead, she was recommissioned in 1953 as a deep-diving tender, serving until 1966, including testing the Royal Canadian Navy's DATAR system on Lake Ontario. Her final decommissioning occurred in December 1966, and she was sold in 1975. Her service history underscores her versatility, transitioning from wartime minesweeper to a support vessel, and highlighting her role within the broader scope of Canadian naval and maritime operations.

This description has been generated using GPT-4.1-NANO based on the Vessel's wikidata information and then modified by ShipIndex.org staff.