He was furnished with a yacht, the " Heemskirk," and a fly-boat, the " Zeehaen " (or " Sea Hen "), under the command of Captain Jerrit Jansen.
In 1642 the governor and council of Batavia fitted out two ships to prosecute the discovery of the south land, then believed to be part of a vast Antarctic continent, and entrusted the command to Captain Abel Jansen Tasman.
Jansen ended by attaching himself strongly to the latter party, and presently made a momentous friendship with a like-minded fellow-student, Du Vergier de Hauranne, afterwards abbot of Saint Cyran.
In the hope of repressing their encroachments, Jansen was sent twice to Madrid, in 1624 and 1626; the second time he narrowly escaped the Inquisition.
Antipathy to the Jesuits brought Jansen no nearer.