Despite extensive search efforts in the Cradle Mountain area, Victorian man Christopher Inwood has not been located.
A Tasmania Police helicopter crew worked in the northern section of the Cradle Mountain- Lake St Clair National Park on Thursday, but there was no sign of the 52-year-old.
Searches on two previous days involved police officers, SES volunteers, police drone operators, a police helicopter crew and Parks and Wildlife Service rangers.
Today, Tasmania Police made the decision to scale back the active search.
"Police will continue to follow up any new leads or information that may assist in locating Christopher," Western District Search and Rescue Inspector Steven Jones said.
"Our thoughts remain with his family who are affected during this incredibly difficult time."
Mr Inwood's white Toyota HiAce van was found in the car park of a ranger station about 7.30am on Tuesday.
He had last been seen in Kindred, in the state's north, about 8.30pm on Monday and police were operating on the belief Mr Inwood drove from Kindred to Cradle Mountain late Monday night.
"Extensive search efforts have been undertaken in the area where the missing person was last believed to be," Inspector Jones said.
"At this stage, that area has been comprehensively searched, and all reasonable search strategies have been completed."
Inspector Jones said Mr Inwood's vehicle was located on the outskirts of the national park, but there was currently no further evidence to confirm his location.
"Given the length of time Mr Inwood has been missing and the harsh weather conditions in the area, if he has been fully exposed to the elements, sadly, his chances of survival are extremely low," Inspector Jones said.
If anyone has information about the location of Mr Inwood, pictured, or his recent movements, call Tasmania Police on 131 444.
