New South Wales police say there is still no sign of a man and his two grandsons who are missing near Lithgow, west of the Blue Mountains.
The 64-year-old man and the two boys, aged nine and 12, failed to return home yesterday after bushwalking at Newnes Plateau.
Inspector Colin Cracknell says the man's white Nissan Navara has been found in the search area.
"It's a location that he has apparently visited previously with the children's mother when she was a child," he said.
"But it's certainly nowhere near where we were advised that that's where he was heading this time.
"Unfortunately we haven't been able to find either himself or the two children at this stage."
Inspector Cracknell says the area where the car was found is often used for canyoning.
"It is an area that is quite popular with canyoners, hopefully they haven't decided to go canyoning, because they certainly weren't equipped for that activity," he said.
"But it's certainly quite thick bushland and there a number of steep ravines and cliffs in the vicinity."
The man's mobile has been traced to the Newnes area, which is where police and emergency services are concentrating their search.
Police started searching the area last night but failed to find any trace of the trio.