He made several expeditions to the Hawkesbury River and Broken Bay areas north of Sydney and spent a year on Norfolk Island after the Sirius was wrecked there.
Worgan's surviving papers, in the form of a letter to his brother in England, are now held at the Mitchell Library in Sydney.
His ventures into Sydney bushland from April 1788 were prompted by an 'inclination to ramble',[7][8] a continuation of a European tradition that could be undertaken in the Australian landscape.
[11] The first section was written on the Sirius (12 June 1788) and describes arriving at Sydney Cove, Port Jackson and his party's first encounter with Aboriginal Australians.
Explorations in land had been made and he tells of "Park-like Country" and a mountainous region where smoke was seen and thought to be inhabited to the west.
In the journal Worgan is very interested in the various tribes that the First Fleet met and describes their physical attributes, behaviour, way of life and interaction with the Europeans in detail.
The journals were presented to the State Library of New South Wales in 1955 by Mrs Margot Gaye for her deceased aunt, Miss A. Batley.
[12] While in New South Wales he taught music to Elizabeth Macarthur (teaching her to play "God Save the King" and "Foote’s Minuet"),[13] leaving his piano with her when he returned to England in 1791.