 The tour program on board the Massachusetts has evolved over the years . In the late 1960s and early 1970s there were guided tours . About the mid @-@ 1970s visitors were given a radio receiver so they could listen to a pre @-@ recorded presentation in different areas of the ship . Today , interpretation is provided by signage and videotaped interviews with former crewmembers about their experiences working in different areas of the ship . 
