These maps have been used by explorers crossing Central Australia and Antarctica.
In 1914 Shackleton set out to cross Antarctica on foot.
To cross Antarctica on foot, supplying provisions would have to be well-planned.
Ernest Shackleton led an expedition to try to cross Antarctica in 1914.
Sipping tea in Steger's tent that night, the two men discovered a mutual interest in crossing Antarctica.
Long was the first man to have crossed Antarctica alone via the South Pole.
Shackleton is most famous for rescuing his entire crew after an ill-fated expedition to cross Antarctica in 1915-16.
It crosses the Southern Ocean and Antarctica.
When Steger crossed Antarctica, hundreds of thousands of students were able to follow his daily progress through computer links.
Shackleton and his crew of 27 men sailed in 1914 on an expedition to cross Antarctica on foot.
