The IGI gives Job's date of death as 20 July 1848, but does not say where.
Does this tally with you information?
Marine Births and Deaths
The 1856 Act made provision for the registration of births and deaths which occurred at sea while en route to NSW. The Registration of marine events included information such as the name of the ship, originating port and the longitude and latitude defining where the events took place.
Marine births and deaths were originally bound into separate registers and each given a number beginning with an "M". This practice was amended later in the century as the number of births and deaths at sea declined.
Marine births from 1888, and marine deaths from 1894 were still registered on the separate registration sheets, but these were now bound with the ordinary returns at the end of each year and were allocated a registration number in sequence with other births or deaths.
But as with all registrations there has to be an informant.
1848, I'll have a look
He was travelling on the ship 'Subraon' which had left Port Nicholson on the 15 August. Arrived in Sydney on the 18th. Arrived 1 September in Newcastle.
Job Hudson had probably boarded in Sydney. He had just received a contract in Newcastle to build the barracks there. Apparently, he had a few drinks and jumped overboard.
He was a builder from Sydney, but had been living in Newcastle for a few years. A very rich man, he owned a lot of property in Newcastle.
The circumstances surrounding the death seem suspicious to me, he was a wealthy man, had just been granted a contract as a builder, there is a hit in some records that he may have committed suicide but this does not seem likely. Other documents have suggested that he had some sort of deal with the captain of the Subraon, something had gone wrong with the deal. It is after that that he fell from the boart. I cannot find any record of his death or of an inquest. The captain of the Subraon report his death. His ex wife was quick to claim his money and assets, for that time it was a considerable amount.