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The Earth has been divided into four hemispheres, with lines of Latitude and Longitude in order to enable humans to navigate, reach and know where they were in the vastness of the oceans. Navigation was due mainly to a sextant (and a visible sun) and, eventually, an accurate ship's chronometer (clock). Nowadays, with GPS, and other modern devices, charts on paper are no longer vital, but very important if modern devices suddenly run out of power, or fail!

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