Grave fears held for two men missing in waters off Far North Queensland

Police have scaled back a search for a missing man after his boat washed up close to croc-infested waters near Weipa in Far North Queensland.

Emergency crews conducted air, land and water searches in the Mission River area today where 42-year-old Anthony Vanharen's boat was found on Saturday.

Officers told 9News the ground search has been suspended, and crews will now focus on aerial investigations.

Mr Vanharen last phoned his family on April 29 and police have an unconfirmed sighting of him on the 30th.

Weipa Police Senior Constable Joe Moran said officers have ruled out foul play, and Mr Vanharen's disappearance is out of character.

"He maintained contact with family members all the time and the family members have not heard from the missing person. It appears that foul play is unlikely," Const. Moran said.

Mr Vanharen is described as Caucasian, about 180 centimetres tall with a thin to proportionate build and shoulder length brown hair.

Anyone with information on his whereabouts is urged to contact police.

Boatie missing from Port Douglas

Meanwhile police and SES are also searching for a boatie, missing from Port Douglas.

The 59-year-old man was reported missing by a family member on Friday, May 1.

The man lives on a yacht in the Dickson Inlet and has not been in contact with his family which is out of character.

It is believed the man may have suffered a medical episode and fallen from the pontoon into the water.

That search is not due to resume until tomorrow morning due to the tides.