جون ماكدونالد
In 1969 "John A. Macdonald" assisted the then-new in rescuing during her transit of the Northwest Passage. "John A. Macdonald" made a double transit from the east to west and returned west to east. During the rescue, "John A. Macdonald" broke her starboard propeller in heavy ice; the propeller is on display by the Dartmouth Ferry Terminal, Dartmouth, Nova Scotia. "John A. Macdonald" was assisted by the United States Coast Guard icebreakers "Northwind" and