Mr Forbes is aiming to complete the distance by the end of April.
He said: “I’m still walking every day, and the Mayor’s Charity has nothing in it at the moment.
“The Mayor’s Charity benefits so many local people, and any money raised will be a benefit.
Mayor of Rochdale, Councillor Billy Sheerin is delighted at Mr Forbes’ efforts.
He added: “David is an amazing fellow who has been a member of the Mayor’s Charity Committee for several years. He has always been supportive of charities and for him to take up the mantle like Captain Tom is tremendous.