Charman re-joined The Sports early in the season from league rivals Bognor Regis Town.
Charman spent twelve years of his career with Horsham and has also featured for Lewes, along with previously playing for Eastbourne Borough during the 2011/12 season.
He played under current Boro manager Jamie Howell whilst at Bognor.
The popular figure at Priory Lane has, however, found his opportunities limited and he has left with the club`s blessing to look elsewhere for more playing time.