Pamela Seed
Rice: Latitude: The Art and Science of 15th Century Navigation
This is a great site to read about how navigation began in Europe and what tools were used. Make sure to read the segments on coastal navigation, maps, and ocean currents.
Pamela Seed
The Art and Science of Fifteenth Century Navigation: Latitude
Chronicle of the changes that occurred in various areas when latitude was identified in 1516. Site includes links to the changes in maps, compass roses, and the science of sailing.