The rescue operation for the American schooner Nina resumed this morning at 9.30am.
An Air Force Orion is searching an area north of Northland using visual and radar methods to look for any sign of the missing schooner or its life raft.
The search area, centred 160 nautical miles north of North Cape is expected to cover approximately 3,780 square nautical miles, and has been calculated for a life raft search, Rescue Coordination Centre New Zealand (RCCNZ) Mission Controller Jeff Lunt said.
The seven-strong crew of the classic 21-metre racing yacht, which was sailing to Australia from Opua in the Bay of Islands, was last heard from on June 4.
The search area was narrowed down overnight based on numerous factors including ocean drift patterns, RCCNZ spokeswoman Sarah Brazil said.