Listed below are links that may be of use 

-1. Always check the weather before leaving the dock and keep a "weather eye" when on the water.
https://www.marineweather.co.nz/

2. Tides
https://www.marineweather.co.nz/

3. Coast Guard Education
https://www.boatingeducation.org.nz/

4. Coast Guard NZ
https://www.coastguard.co.nz/

5. Maritime Police
https://www.police.govt.nz/about-us/structure/teams-units/maritime-units