In the GPS age, steering a ship by the stars can seem like a mystical lost art. How did ships possibly manage to cross huge expanses of ocean and still make their intended landfall? What do you actually see when you look through a sextant? What do latitude and longitude really represent? Spend Saturday morning with the Museum's public historian and expert navigator to explore the mysteries behind celestial navigation. Learn about the skills that ship captains relied on and hear about the difficulties ships faced in the eras before GPS.