John Moody (Moodie) was on the List of Surgeons of the Royal Navy who were fit for service in 1841.
He was appointed Surgeon to H.M.S. Childers in the East Indies on 13 April 1839. H.M.S. Childers, Commander E. Pellew Halsted, was a sloop built at Chatham in 1827 and sailed with a crew of 71 officers and men, 24 boys and 20 marines. 
John Moodie was employed as Surgeon Superintendent on two convict ship voyages to Australia:
Lord Auckland to Van Diemen's Land in 1849
Blackfriar to Van Diemen's Land in 1851
John Moody is listed in the Medical Register 1865.
Residence Melville Hospital, Chatham.
Qualifications: Surgeon in the Navy, 1838.
Mem. Royal College Surgeons Eng. 1850. 
 Haultain, C. (compiled), The New Navy List, 1840, p. 199