How Sailing Manuals Helped Shape Our Global Perspective of Earth

• "Rutters," historical sailing manuals from the 15th to 17th centuries, were crucial in transforming how humanity perceived Earth as a single, interconnected planet.
• The EU-funded RUTTER project analyzed these records to understand how practical maritime data contributed to modern global scientific knowledge.

The Role of Sailing Records

• Rutters functioned as practical cookbooks for navigation, detailing currents, winds, latitudes, and natural features.
• While often overlooked as "boring" documents, these records became increasingly precise over time, allowing navigators and cartographers to map global weather and sea patterns.
• Researchers systematically compared archives from across Portugal and Spain to trace how maritime knowledge circulated between sailors, regions, and cultures.

Collaboration and Local Knowledge

• Scientific progress during the Age of Discovery heavily relied on information shared by local sailors worldwide.
• A turning point in 1565, when Spanish ships successfully used seasonal currents to cross the Pacific, demonstrated the necessity of utilizing local maritime wisdom.
• The project challenges the myth that progress was driven solely by elite thinkers, showing that it was shaped by the daily observations and actions of ordinary people.

Legacy for Modern Science

• These centuries-old documents serve as valuable resources for reconstructing historical marine biodiversity and weather conditions.
• The project highlights that modern scientific understanding is built upon a long chain of practical observations, shared and refined across generations.