Before leaving, Shackleton instructed Frank Wild that he was to assume full command as soon as the James Caird departed, and that should the journey fail, he was to attempt to take the party to Deception Island the following spring. The James Caird was launched from Elephant Island on 24 April 1916. The wind was a moderate south-westerly, which aided a swift getaway, and the boat was quickly out of sight of the land.
Shackleton ordered Worsley to set a course due north, instead of directly for South Georgia, to get clear of the menacing ice-fields that were beginning to form. By midnight they had left the immediate ice behind, but the sea swell was rising. At dawn the next day, they were 45 nautical miles (83 km; 52 mi) from Elephant Island, sailing in heavy seas and force 9 winds. Shackleton established an on-board routine: two three-man watches, with one man at the helm, another at the sails, and the third on bailing duty. The off-watch trio rested in the tiny covered space in the bows. The difficulties of exchanging places as each watch ended would, Shackleton wrote, “have had its humorous side if it had not involved us in so many aches and pains”. Their clothing was designed for Antarctic sledging rather than open-boat sailing. It was not waterproof, and contact with the icy seawater left their skins painfully raw.
Success depended on Worsley’s navigation, which was based on brief sightings of the sun as the boat pitched and rolled. The first observation was made after two days, and showed them to be 128 nautical miles (237 km; 147 mi) north of Elephant Island. The course was changed to head directly for South Georgia. They were clear of floating ice but had reached the dangerous seas of the Drake Passage, where giant waves sweep round the globe, unimpeded by any land. The movement of the boat made preparing hot food on the Primus nearly impossible, but Crean, who acted as cook, somehow kept the men fed.
Source: wikipedia