HMNZS Tarapunga was a modified Moa class

Moa class patrol boat

The Moa-class patrol boat is a class of patrol boats built between 1978 and 1985 for the Royal New Zealand Navy by the Whangarei Engineering and Construction Company...

 inshore patrol vessel of the Royal New Zealand Navy

Royal New Zealand Navy

The Royal New Zealand Navy is the maritime arm of the New Zealand Defence Force...

 (RNZN).

She was built by 1980 by the Whangarei Engineering and Construction Company as a version re-engineered for use as an inshore survey vessel.

After decommissioning, she was purchased by North American owners and can be seen in Harper's Island Episode 1, as the charter boat that brings the wedding party to the island.