Cat Hill, Ascension Island

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Cat Hill
Part of NSA-GCHQ Composite Signals Organisation
Ascension Island
Cat Hill
Cat Hill
Cat Hill is located in Ascension Island
Cat Hill
Cat Hill
Coordinates7°57′S 14°25′W / 7.95°S 14.41°W / -7.95; -14.41Coordinates: 7°57′S 14°25′W / 7.95°S 14.41°W / -7.95; -14.41
TypeSatellite ground station and eavesdropping centre
Site information
OwnerGovernment of the United Kingdom
Site history
In use1961–present

Cat Hill is a settlement on Ascension Island, an island which forms part of the British Overseas Territories.


The Target Tracking Radar Station, known as the Golf Ball, was built on this site, designated for use as a base for the United States Armed Forces,[1][2] between 1960 and 1961.[3] The site subsequently became the location of the joint NSA-GCHQ Composite Signals Organisation facility on the island.[4]


  1. ^ Sue Steiner; Robin Liston; Richard Grundy; Mike Huntley (1 November 2007). St. Helena, Ascension and Tristan Da Cunha, 2nd. Bradt Travel Guides. p. 115. ISBN 978-1-84162-198-2. Retrieved 28 March 2012.
  2. ^ Kogan Page; World of Information Staff (October 2003). Americas Review 2003/2004. Kogan Page Publishers. p. 315. ISBN 978-0-7494-4064-0. Retrieved 28 March 2012.
  3. ^ Avis, Graham (9 February 2002). "Avis Part Eighteen - Curry or Stew!" (personal anecdote). Retrieved 13 April 2014.
  4. ^ "The NSA Empire's expanding colonies". 5 October 2013. Retrieved 18 October 2017.