Ships seem to be playing "catch me if you can" with the Poor Knights by entering the islands' exclusion zone and scurrying off when warned.
This may explain the lenient approach taken by Maritime New Zealand towards 17 ships that breached international sea law last year. None were fined despite being subject to a $12,000 fine (plus a skipper's penalty of $2000).
The infringement notice must be served when the vessel is in New Zealand waters.
Given the ships are breaking the law when leaving New Zealand, there would seem to be a legislative flaw with the law.
Since December 2004, ships longer than 45 metres have had to stay at least five nautical miles east of the Poor Knights.