The Sentinel serves Marion, Mattapoisett and Rochester local news, features and events. Each publication features milestones, police log, sports, entertainment, business news, school news and commentary on local issues.The Sentinel is in the Boston, MA DMA. This paper is a part of the South of Boston Media Group. The Sentinel offers ROP and insert advertising opportunities in its weekly circulation. Echo Media has direct relationships with over 7,500 newspapers providing tremendous local coverage.