A search has resumed near Nelson for a missing helicopter after poor weather delayed part of the operation this morning.
Search and rescue controller Greg Johnston said they were hopeful of a sustained period of searching this afternoon.
"The search area has been divided into separate smaller areas and each will be inspected very closely by one of the helicopters operating at low altitude and low speed.
"The search area was based on information from the helicopter's tracking system. The area being searched is around 5km in each direction from that point, Mr Johnston said.
Damian Webster was flying one of two choppers from Karamea on the West Coast to Nelson on a maintenance mission yesterday when his aircraft was lost over the Kahurangi Range.