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
NRP Afonso de Albuquerque (1934) confined their officers and declared their solidarity with the Spanish Republic. As the ships were leaving the Tejo estuary they were fired upon by the batteries from the forts and both the "Afonso de Albuquerque" and the "Dão" received direct hits and were grounded. Some of the sailors were killed while trying to flee, but most of the sailors were arrested and sent to the penal colony of Tarrafal in Portuguese Cape Verde. After the mutiny was put down the government claimed that the sailors had prepared to sail to Spain in order to assist the Spanish Republic. On 28