The Gibraltar Aerobeacon (pictured in link below) is positioned on top of the Rock of Gibraltar. The Rock is approximately in length. About six furlongs () to the south of the north end of the Rock is the signal station at . The 1911 Encyclopædia Britannica indicated that, at the station, the names and messages of passing ships are cabled to all parts of the world. The map of Gibraltar reveals Signal Hill close to the end of the cable car line, at .