UK-based researchers have revealed details of the world’s earliest known marine navigation tool that may have helped Portuguese explorer Vasco da Gama to reach India. Recovered from a shipwreck in the Indian Ocean in 2014, the tool called astrolabe is a bronze disc, 17.5 centimetres in diameter, engraved with the emblem of the King of Portugal from 1495-1521.According to the Marine archaeologists object is an astrolabe, an instrument once used by mariners to measure the altitude of the Sun during their voyages. It is believed to date from between 1495 and 1500. The tool was recovered from a Portuguese explorer which sank during a storm in the Indian Ocean in 1503.
What is GPS?
It is simply a device that is capable of receiving information from GPS satellites and then to calculate the geographical position. Using suitable software, the device may display the position on a map, and it may offer directions.
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