A cloaking field was a device employed to make the user invisible. Several races had access to this technology. In 1913, the Family of Blood used a cloaking field to hide their ship; it glowed green whenever someone came into contact with it (TV: Human Nature / The Family of Blood) In 2009, Commander Kaagh of the Tenth Sontaran Battle Fleet used a cloaking field to hide himself and his ship. (TV: The Last Sontaran) Anubian spacecraft could cloak. (TV: Curse of Anubis) For centuries, a Dalek fleet used a cloaking field to hide from view of the Game Station. (TV: Bad Wolf/ The Parting of the Ways)