NZ hydrographic data and charts
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HI,
the data source can be found here: http://www.linz.govt.nz/data/linz-data-service , Most of the datasets are free to use and are available under an open Creative Commons license.
This would be in addition to NZ topo maps that you already have. These are specific Marine charts for boats, ships & yachts.
It would be fantastic if you could implement.
Cheers Julian