Page "Roaring Forties" Paragraph 6

During the Age of Sail, ships travelling from Europe to the East Indies or Australasia would sail down the west coast of Africa and round the Cape of Good Hope to use the Roaring Forties to speed their passage across the Indian Ocean, then on the return leg, continue eastwards across the Pacific Ocean and under Cape Horn before sailing up the east coast of the Americas to home.

" To run the easting down " was the phrase used to describe the fast passages achieved in the Roaring Forties.