In 1831 James Clark Ross pinpointed this spot; later Arctic studies found it had moved more than 150 miles
... 
On May 31, 1831, Ross located the position of the north magnetic pole on 
Boothia ... Ross had discovered the Ross Sea and he now set his sights on the 
south... [DOC] [TLE] James Clark Ross - Wikipedia [PAR] Sir James Clark Ross (15 April 1800  3 April 1862) was a British naval officer 
and explorer remembered today for his exploration of the Arctic with his uncle Sir 
John Ross and Sir William Parry and, in particular, ...