LONDON, United States (AFP) — A British-based shipwreck hunter said Tuesday a navigation tool he found that guided Portuguese explorers on a perilous voyage to India in the 16th century has been confirmed as the world’s oldest astrolabe. David Mearns found the bronze disc during a dive on a shipwreck off the coast of Oman in 2014 but said Warwick University had only recently confirmed what it was after laser scans revealed etches on it. […]