At a District Court hearing in May, Isobel Karaitiana claimed she wasn't bound by the Statistics Act, but only to He Whakaputanga or the declaration of independence signed in Waitangi.
At that hearing Judge Davis said that declaration hadn't been enacted into law, but was a longstanding law.
Whatarau relied on the Te Ture Whenua Maori Act 1993 - a Parliamentary statute to reform the laws relating to Maori land- and sought dismissal of the charges under provisions of that Act.
Judge Davis rejected his argument, saying that the provisions of the Te Ture Whenua Maori Act related to Maori land whereas the charges Whatarau faced related to the collection of information and statistics under the Statistics' Act.
The High Court at Whangarei yesterday heard his argument before Justice John Faire who reserved his decision on the appeal.
Whatarau said Judge Davis ruled on the basis of the English rather than the Maori version of the Te Ture Whenua Maori Act 1993.
Justice Faire questioned why the Statistics' Act, which required all New Zealand citizens to complete the Census form and the consequences if they failed to do so, didn't apply to him.
Whatarau replied the Statistics' Act didn't supersede the Te Ture Whenua Maori Act 1993.
The judge said Whatarau's argument boiled down to a jurisdictional issue.