Blue Ensign
The Canadian Blue Ensign is similar to the Red Ensign. The flag was used as the jack of the Royal Canadian Navy from its inception until the adoption of the Maple Leaf flag in 1965. The Blue Ensign was approved by the British Admiralty in 1868 for use by ships owned by the Canadian government. Carr's "Flags of the World" says "The Blue Ensign is charged with the shield in the fly", and that the Blue Ensign "is worn 'as a Jack' for distinguishing purposes when at anchor, or under way and dressed with masthead flags".