Cholewa said the novice sailor would likely get to Whakatane by tomorrow morning however police, the Coastguard, Maritime New Zealand the Rescue Coordination Centre planned to "talk" to DeWet about abandoning the journey to Auckland.
Meanwhile friends back in Hawke's Bay were rapt DeWet was safe.
A worker at The Loading Ramp bar in Havelock North said they were "absolutely" relieved the shy but friendly young man had been found.
"He's a really cool guy who did something dumb."
Sam McClinchie from the Tutira Store where DeWet went every day for his mail said she was pleased he had been found alive and well.
DeWet had only just bought the boat six weeks ago and done it up. He wanted to go on an adventure, his former employer Kevin Blair said.
Blair, a dairy farmer in Tutira, said DeWet worked for him for a year to learn about New Zealand farming before finishing up in late August to undertake the sailing trip.
"He wanted to have an adventure. So he'd bought a yacht on Trade Me, locally, and we suggested he needed to join the sailing club, and Coastguard, and get some experience."
Blair said sailing lessons with a friend fell through but the friend checked out the boat and made some minor adjustments and recommendations to DeWet.
"Another friend was moored in the yacht club there and had taken him a couple of books over about sailing and reading maps and a candle in case the battery failed.
"And everybody suggested he shouldn't go anywhere until the summer or until he'd gained some more experience. But at 20 he was ready for a big adventure. As you are at that age he was '10ft tall and bullet proof'."
Blair said DeWet, who he described as a hard worker but a bit of a loner, was strong and healthy, at home in the outdoors and self-sufficient. His plan was to sail to the Hauraki Gulf.
His parents owned a dairy farm in South Africa where DeWet grew up and he knew how to hunt and ran to keep fit.
Blair said earlier he hoped DeWet was hunkered down in a bay somewhere, taking shelter from bad weather and waiting it out.
Search and Rescue Mission Co-ordinator Mike Roberts said there was still no communication with the yacht but the helicopter made close passes and the yacht appeared undamaged and the skipper unharmed.
"Thankfully, the worst weather is now behind Luna and she should be in comfortable sailing conditions," he said.
"We are glad for the outcome and we will always do what we can when a vessel is missing or in danger but this has been a frustrating endeavour.
"The skipper is inexperienced, left a vague trip plan, and seems to have had no working communications equipment since Friday last week. Even when two search aircraft located him he was unable to communicate his intentions or report on his condition."
Roberts said boaties should always leave a detailed trip plan with family, a friend or a boating organisation, and to take at least two forms of communications that will work when wet.
A registered distress beacon was also highly recommended for all boats.
"If we don't know where you are going and you cannot call, then you cannot be rescued if you get into trouble."
The Rescue Coordination Centre (RCCNZ) put an alert out this morning asking for information about the overdue 6.7m yacht, Luna.
Roberts said Luna was last seen at Anaura Bay, 73km north of Gisborne, at 4.15pm on Monday.
Weather in the area was deteriorating earlier today, and 30-knot winds, rain and low cloud were expected sparking the concern.
Luna sailed from Napier on Friday morning, bound for Auckland. The skipper had told a friend he would call every 24 hours and made a cellphone call at 10.30pm on Friday but has not called since.
"Our concern is this appears to be an inexperienced sailor heading into weather dangerous for a small boat and no one has heard from him," Roberts said earlier.
The Maritime Radio Service asked all vessels in the area for sightings of the yacht and a Royal New Zealand Air Force helicopter searched the area for several hours.
DeWet joined the Napier Sailing Club last month so he could work on the yacht, according to manager Shelly Te Uki.
"He's a really nice guy. We hope he's okay," she said earlier.
Te Uki heard of DeWet's plans to sail up the coast to Auckland and asked if he felt confident enough to do it.
He told Te Uki: "I'll be fine."
Club members were not aware he had left and the first she knew DeWet had set off was when she learned there was a search under way for him.
Cholewa said the helicopter had searched the coastline between Napier and the Eastern Bay of Plenty.
A plane found Luna anchored in Anaura Bay, near Tolaga Bay, on Monday. The skipper waved to the aircraft and appeared unharmed but made no other contact with the aircraft or anyone else since.
Cholewa said the yacht was anchored close to shore and two police observers on board the plane judged the young man's body language and deemed him and the yacht to be "absolutely fine".
He said the plane flew low and the pilot tried to make radio contact with Luna but there was no reply.
- NZ Herald