Gilsemans is most noted for joining the explorer Abel Tasman on his expedition in 1642-43 during which Tasmania, New Zealand and several Pacific Islands became known to Europeans. Gilsemans produced a number of drawings that documented island and native life. His depictions of the Māori people were the first for Europeans.
Sketcher and cartographer, he is thought to have been responsible for the coastal profiles in Tasman's journal and therefore the first European to make an image of Van Diemen's Land.  Gilsemans chart is responsible for documenting the first European landing in Tasmania in 1642  as a result of which Gilsemans Bay near Dunalley is named after him.
|Wikimedia Commons has media related to Isaack Gilsemans.|
- "The Merchant of the Zeehaen: Isaac Gilsemans and the Voyages of Abel Tasman" by Grahame Anderson
- "Some New Aspects of Tasman's Visit to the East Coast of Tasmania in 1642" by A. L. Meston
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