Ascension Island a staging point by the British military during the Falklands War. Ascension Island hosts one of four ground antennas (others are on Kwajalein Island, Diego Garcia, and Cape Canaveral) that assist in the operation of the Global Positioning System (GPS) navigational system. NASA operates a Meter Class Autonomous Telescope (MCAT) on Ascension Island for tracking orbital debris, which is potentially hazardous to operating spacecraft and astronauts, at a facility called the John Africano NASA/AFRL Orbital Debris Observatory. In 1501, the Portuguese navigator Afonso de Albuquerque sighted the island on Ascension Day (which fell on 21 May that year) and named
5th Portuguese India Armada (Albuquerque, 1503) to bolster the Indian Ocean coastal patrol. April 6, 1503 - The first squadron of the 5th Armada, three (or four) ships under Afonso de Albuquerque, departed Lisbon. (Chronicler Diogo do Couto places it in mid-March) April 14, 1503 - The second squadron of the 5th Armada, three ships under Francisco de Albuquerque, departed Lisbon. (Couto places it in early April) Early May, 1503 - The third squadron of the 5th Armada, three ships under António de Saldanha, Rui Lourenço Ravasco and Diogo Fernandes Pereira), departed Lisbon. (Couto places it in mid-April) May 1503 - After making a stop at