Marine rescue units responding to reports of a capsized boat near Aqualand Marina found a dead man in Lake Lanier on Sunday, authorities said. The body of Robert Armistead, 54, of Hoschton was recovered by the Hall County Fire Department’s dive team, according to Sgt. Kiley Sargent, Hall County Sheriff’s Office spokesman. A caller reported the capsized boat at about 10:30 a.m., and the Hall County Fire Department responded with rescue units and a marine rescue boat, said Hall County Fire Chief David Kimbrell.