Ross crossed the Antarctic Circle on 1 January 1841.[2] Shortly after, he discovered the Ross Sea and Victoria Land, charting 900 km (560 mi) of new coastline, reaching Possession Island on 12 January and Franklin Island on 27 January[2] (which Ross named after John Franklin[10]). He then reached Ross Island, later named after him by Robert F. Scott,[citation needed] with the volcanoes Mount Erebusand Mount Terror, which were named for the expedition's vessels. They sailed for 250 nautical miles (460 km) along the edge of the low, flat-topped ice shelf they called variously the Barrier or the Great Ice Barrier, later named the Ross Ice Shelf in his honour.[citation needed
Back when men were men. Thanks to Mr. Ross the arctic and Antarctica he located the magnetic poles!
This is actually right smack in the middle of everything Arctic exploration: James Clark Ross's father was John Ross who famously failed to find the NW passage because of he thought he saw mountains in the way when really there was just ocean into which John Franklin would later sail aboard the very same Erebus and Terror on which Kames Clark Ross was earlier captain which is possibly why Sir James Ross would then spend years searching for Franklin and later discover that every man had perished, making it the worst exploration disaster in the Arctic, second only to the later catastrophic expedition to the South Pole led by Sir Robert Falcon Scott, who on the way named an island after Ross who had named an island after Franklin.