Even if you aren't using a marina, you are still required to arrive with a clean hull, and Northland Regional Council, for example, will have divers traveling around the region to randomly check boats.
They ask you to double check niche areas on the boat, such as keel, bow thrusters, prop and rudders, because fanworm can be hidden, and be missed even by professional boat cleaners.
There are three steps that we recommend:
1. Keep receipts from haul outs and antifouling onboard your boat, and take photos of them with your phone camera as a back up
2. Check in with the marinas and areas you plan to visit before you leave
3. Plan your hull cleaning around your cruising itinerary to meet the 6 or 1 rule