Chief Customs officer Nick Sparey said international yachts sail to New Zealand between October and mid-December to beat the hurricane season and usually leave between mid-April and early June. Of the seven boats checked on Monday all but one had complied with the regulations and sent paper work to Opua from the port at which they departed.
"Just like at airports people have to fill out departure and arrival cards so do these international sailors," he said.
The Hawk and its four-strong crew spend most of their time patrolling the coastline from Coromandel north, regarded as the number one risk area.
"Opua is the busiest port for overseas yachts."
Mr Sparey said a shipment of drugs like cocaine was the biggest threat but there had been no interceptions off Northland. It was likely New Zealand would be used as a transit port by criminals intent on making it to Australia. However, smaller amounts of drugs could be dumped in New Zealand.
The launch is outfitted with state-of-the-art equipment. The Hawk crew greet the international sailors and at Opua resident Customs officer Gary Burton makes a thorough search and sometimes the boats are checked by a drug sniffer dog.