Every time a driver follows turn-by-turn directions, a delivery arrives on time, or an emergency responder finds someone in need, they are relying on a system built on precision, mathematics, and quiet brilliance. Few people realize that at the foundation of modern GPS technology stands a Black woman whose work reshaped the world.

Gladys West, a pioneering mathematician whose calculations helped make the Global Positioning System possible, has passed away. Her death marks not just the loss of a scientific trailblazer, but a reminder of how often Black women’s contributions power modern life without recognition.