This comes after Inspector Steve Jones said on Monday afternoon no sea or land assets would be utilised in the search on Tuesday while an independent review of the search was conducted by police.

"A certified hydrographic surveyor from Devonport with a multi-beam sonar will conduct a search of a second area identified by police," a police spokesman said on Tuesday.

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The spokesman said nothing related to the search had been found by the sonar on Monday.

"An overview and assessment of the search will also be conducted," they said.

Police are calling on members to the community searching the coastline not to enter the water.

"While the police search is ongoing, and with conditions in the area, to ensure a coordinated approach and safety of the community, police ask people not to enter the water," the spokesman said.

EARLIER

No sea or air assets will be ulitised by Tasmania Police in the search for Thomas Courto and the missing boat off the North-West Coast on Tuesday.

Inspector Steve Jones said on Monday afternoon an independent review of the search effort so far would be undertaken by Tasmania Police on Tuesday.

Thomas Courto, Bree-Anna Thomas and Isaiah Dixon set out on a day trip on a boat from Wynyard last Monday, but didn't return.

The bodies of Bree-Anna and Isaiah were discovered last week, washed ashore between Fossil Bluff and Table Cape.

Inspector Jones said no sea or air assets would be utilised while the review was completed, which was expected to happen by the end of Tuesday.

"The plan is to have the whole search since it commenced on Monday last week reviewed by an independent search controller within Tasmania Police," he said.

"What that search controller will be doing is a thorough review of what has been done so far and seeing if there are any areas that he believes we should be looking at.

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"We are confident that we are doing everything we can and have searched everywhere we believe Thomas and the boat will be.

"I can't give a definitive date on when we will actually complete the searching.

"We hope we may find Thomas and the vessel, but we may not."

Thomas Courto's family will continue searching from Fossil Bluff on Tuesday.

"We want as much as support as we can get," a member of the family said.

On Monday a professional hydrographic surveyor conducted sonar scans of the seabed in a designated area around Table Cape.

"The search area has been determined by utilising a number of scientific calculations using drift pattern detections and also looking at where we have found Bree-Anna, Isaiah and a t-shirt as well.

"We will be focusing on those areas around Freestone Cove and Table Cape."

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Inspector Jones said the t-shirt had been identified by Isaiah's family as his.

Inspector Jones said they were doing all they could to help bring Thomas back to his family.

"Given a number of calculations on timeframe for survival we would suggest that unfortunately Thomas may not be alive at this stage," he said.

"The family have been frantically searching the coastline.

"We have maintained contact with the family over the weekend and kept them up to date with all the searching that we have been doing.

"They are still holding hope and we are doing all we can to try and bring Thomas back to his family and his loved ones."

"It would be wrong of me to predict what has happened.

"There are so many scenarios of what could or may not have happened."

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