Hawker sailed to South Australia in 1838 with George Gawler, who was an old friend of his father, and who was to succeed
Captain Hindmarsh, R.N., the first
viceregal representative in the colony. Gawler had made an offer to Hawker's father to take one of his sons to
South Australia with him when he took up his new post. They arrived in
Port Adelaide, described as a "wretched mudhole", in October. There he met harbormaster (and his future father-in-law) Capt.
Thomas Lipson, R.N., accompanied the new Governor on his official entry into the city, and witnessed the swearing-in at the viceregal residence. In December 1838, Hawker joined the party which conducted a survey on the
Sturt River, led by J. W. McLaren who became Deputy Surveyor-General of South Australia. Within ten days of arriving, Hawker had volunteered to accompany a party which went out to retrieve 5,000 sheep left near
Chowilla by overlanders
Henry Inman (his future brother in law), Henry Field and nine others after being attacked by local
Aboriginal people. One attacker was shot dead before Inman, Field and the other overlanders escaped, the fate of the sheep unknown. The retrieval party found themselves opposed by about 300 warriors, and fired at the attackers, killing eight, and wounding several more before they retreated. They returned without the sheep, Field slightly wounded, and his horse badly speared. Hawker subsequently went out as
commissary under command of Police Commissioner
O'Halloran, their force succeeding in protecting other settlers who had been attacked and in retrieving their animals. Hawker soon settled down with his two brothers, and all three engaged in sheep-farming, initially at Mount Dispersion, near
Anlaby Station, north of
Nuriootpa. On 22 December 1841 he discovered a permanent water supply in the Mid-North of South Australia at
Bungaree, which was improved by sinking a well, and transferred his stock there. In 1860 Hawker founded Port Adelaide's first rowing club, called the "Pelican Club", of which he was captain and an oarsman for many years. Their Patron was
Lady MacDonnell, whose name graced one of their two boats. ==Diaries and publications==