In the current state, I wonder what Jacinda will require for an "amber" status ship upon arrival?
All I have read so far relates to air travel, which requires a self-administered test on day 0/1 after arrival, and day 5/6. If the ship is healthy enough, I would say that an Auckland visit alone for Pacific Explorer next month would not require day 0 testing, but would require tests if there is an elevated level aboard.
For ships doing a lap of NZ later in the year, it will be interesting if they still apply two RAT tests during the transit of NZ ports.