A recent note in the International Journal of Maritime History highlights that the routes taken by explorers such as Christopher Columbus, Ferdinand Magellan, and the Manila galleons overlap with the locations of today's major plastic waste patches in the oceans. The study suggests that historical maritime records could help predict how plastic debris moves across the seas. Approximately 270,000 tonnes of plastic are currently floating on the ocean's surface, forming 5.25 quintillion fragments. These fragments tend to accumulate in five large zones known as gyres, which are massive systems of rotating ocean currents. Researchers Gleb and Svetlana Zilberstein from SpringStyle Tech Design in Israel, along with historian John Robert McNeill from Georgetown University in the United States, have compared historical navigation routes with the current locations of plastic waste. They observed a strong similarity between the two, though their findings are based on map comparisons rather than statistical analysis. The explanation for this alignment lies in the nature of ocean gyres. These systems of currents guided sailing ships by providing fast-moving edges, which sailors used to maximize their speed. In contrast, floating plastic waste tends to drift slowly toward the center of the gyres through a process called Ekman transport, which involves a spiral movement of water. "The routes of the sailboats coincide remarkably well with the boundaries of these waste patches," Gleb Zilberstein explains. This suggests that historical maritime routes were chosen based on the natural flow of the ocean, which is now also influencing the movement of modern plastic debris. In the North Pacific, the route taken by Andrés de Urdaneta in 1565 from the Philippines to Mexico aligns with the large Pacific waste patch, which spans between 35 and 42 degrees of latitude north. This area includes two major clusters of waste, one near Japan and the other between Hawaii and California. Similarly, Columbus's first voyage in the North Atlantic overlaps with a gyre and its associated waste patch, including the Sargasso Sea, which contains over 200,000 fragments of plastic per square kilometer. In the Indian Ocean, the route of Abel Tasman in the 17th century crosses the southern accumulation zone east of Madagascar, although the existence of a stable waste patch in this area is still debated. The researchers' method involves comparing historical navigation maps with modern oceanographic data. By overlaying historical routes with current waste distribution, they aim to understand how ocean currents have shaped both past and present movement of materials across the sea. They are now developing models and algorithms to further explore these correlations, though their findings have not yet been formally published. The comparison of historical routes with modern waste distribution could also help identify previously unknown accumulation zones, such as the Eastern Mediterranean, where historical maritime routes align closely with today's waste distribution. The team is also examining the archives of Vitus Bering's Arctic expeditions for potential new insights.