Clive Dennier, left, of the Strathspey & Badenoch Herald, was reported missing by concerned colleagues when he failed to arrive for work on the morning of March 25.
Sonar equipment will be used to scan Loch Hourn in the west Highlands as a Red Cross water rescue team joins the hunt.
It comes after the Skywatch Civil Air Patrol conducted a flyover of the remote area again yesterday to try to find any clues as to what happened to the keen hillwalker, to no avail.
A Police Scotland spokeswoman said: “There are planned searches over the weekend involving the Red Cross, which will be assisting with sonar equipment.
“We remain in daily contact with the family.”
After a number of police appeals, Clive’s VW Polo was found last week in the Knoydart region west of Invergarry, Scotland, resulting in organised searches of the area by police, mountain rescue teams, the coastguard and the Skywatch charity.
But earlier this week efforts were scaled back after no further trace of him was found.
Experienced walker Clive, 50, is reported to have spoken about going walking over the weekend of March 23 and 24. Nobody has heard from him since.
The journalist had been with the Strathspey & Badenoch Herald for around two years and is a former news editor for the Highland edition of The Press and Journal.