南磁極
The following spring when Shackelton set off to attempt to reach the South Pole, he despatched Mackay, Mawson and David northward to reach the South Magnetic Pole, which lay approximately north-north-west of Ross Island. The trek commenced on 5 October, with the men hauling their own sleds and relaying the loads which meant that every kilometre gained by the sledges involved them travelling by foot.