Question: How did Henry Dangar participate in the European exploration of Australia?

Context articles: European exploration of Australia
John Jackson Oakden
Europeans in Oceania
Hartog Plate
Henry Dangar
Dangar Grid
HMS Investigator Anchors
Australian Screen Editors
John Hill (explorer)
Dangar Island

The European exploration of Australia was the exploration of Australia by Europeans or white explorers, encompassing several waves of seafarers and land explorers.
 Dutch navigators were the first Europeans known to have explored and mapped the Australian coastline.
 The first documented encounter was that of Dutch navigator Willem Janszoon, in 1606.
 Dutch seafarers also visited the west and north coasts of the continent, as did French explorers.
John Jackson Oakden (1818 – 31 March 1884), pastoralist, was an English explorer of South Australia, part of the European exploration of Australia, and a pioneer runholder of the Canterbury Region of New Zealand.
European exploration and settlement of Oceania began in the 16th century, starting with Portuguese settling the Moluccas and Spanish (Castilian) landings and shipwrecks in the Marianas Islands, east of the Philippines, followed by the Portuguese landing and settling temporarily (due to the monsoons) in the Tanimbar or the Aru Islands and in some of the Caroline Islands and Papua New Guinea, and several Spanish landings in the Caroline Islands and New Guinea.
 Subsequent rivalry between European colonial powers, trade opportunities and Christian missions drove further European exploration and eventual settlement.
 After the 17th century Dutch landings in New Zealand and Australia, but not settling these lands, the British became the dominant colonial power in the region, establishing settler colonies in what would become Australia and New Zealand, both of which now have majority European-descended populations.
 New Caledonia (Caldoche), Hawaii, French Polynesia, Norfolk Island, Easter Island and Guam also have significant European populations.
 Europeans remain a primary ethnic group in much of Oceania, both numerically and economically.
Hartog Plate or Dirk Hartog's Plate is either of two plates, although primarily the first, which were left on Dirk Hartog Island during a period of European exploration of the western coast of Australia prior to European settlement there.
 The first plate, left by Dutch explorer Dirk Hartog, is the oldest-known artifact of European exploration in Australia still in existence.
 The original dish was returned to the Netherlands where it is on display in the Rijksmuseum.
 A replacement and additional dish were subsequently discovered on three additional visits over the next 200 years
Henry Dangar (1796 - 1861) was a surveyor and explorer of Australia in the early period of British colonisation.
 He became a successful pastoralist and businessman, and also served as a magistrate and politician.
 He was born on 18 November 1796 at St Neot, Cornwall, United Kingdom, and was the first of six brothers to emigrate as free settlers to New South Wales.
The Dangar Grid is the layout of the streets in the centre of the central business district of Newcastle, Australia.
 Named after its designer, Henry Dangar, the Grid was designed in 1823 and implemented sometime thereafter.
 It covers the area from Brown Street to Pacific Street, and from Church Street to Hunter Street.
The HMS "Investigator" Anchors are the two anchors that Matthew Flinders jettisoned from HMS "Investigator" on the morning of Saturday 21 May 1803 in order to avoid running aground on Middle Island in the Archipelago of the Recherche on the south coast of New Holland (now Western Australia).
 In 1973, the anchors were located and recovered by members of the Underwater Explorers Club of South Australia (UEC).
 The recovered anchors became the subject of an ownership dispute between various governments, particularly those of South Australia and Western Australia due to their historic significance as artefacts of a major voyage of European exploration.
 The dispute was resolved with the ownership of the anchors going to the Australian Government who subsequently gifted one of the anchors to the South Australian Government.
 The pair of artefacts is also known as "Flinders' Anchors".
Australian Screen Editors (ASE) was founded in 1996 by Henry Dangar and Jenny Ward.
 The guild is dedicated to the pursuit and recognition of excellence in the arts, sciences and technology of motion picture film and televisual post production.
 The current President of ASE is Fiona Strain ASE.
 Immediate past Presidents include Deborah Peart, Dany Cooper ASE, Jason Ballantine, Dr Karen Pearlman, Lindi Harrison and Peter Whitmore.
 The first President was notable Australia editor Henry Dangar.
John Hill (c.1810 – 11 August 1860) was an English explorer of South Australia and part of the European exploration of Australia.
 Hill was the first European to discover and traverse the Clare Valley.
Dangar Island is a forested island, 29 ha in area, in the Hawkesbury River, just north of Sydney, New South Wales, Australia.
 Dangar Island is a suburb of Hornsby Shire and as at the 2011 Census had a population of 267, which swells dramatically during holiday seasons.
 The island is serviced regularly by Brooklyn Ferry Service and departs from Brooklyn and takes about ten minutes.
 The Brooklyn ferry is itself adjacent to Hawkesbury River railway station.
 The ferry service is in operation 7 days a week.