Dr Gladys West, the American mathematician whose work in satellite geodesy helped lay the foundation for modern GPS accuracy, has died at the age of 95. West died on January 17, 2026, prompting tributes from scientists, engineers and social media users who credited her with shaping one of the most widely used technologies in daily life. She is often described as a “hidden figure” because her contributions stayed largely out of the public spotlight for decades, despite their importance in satellite navigation.
The mathematician behind GPS-level precision
GPS is powered by satellites, but accuracy depends on more than signals and timing. It also requires precise mathematical modelling of the Earth’s shape and gravitational forces, which influence satellite orbits and positioning calculations.West played an important role in this work through her research in geodesy, helping improve how the Earth is represented in satellite-based systems. Her efforts supported the broader scientific advances that later made GPS dependable for real-world navigation.
A 42-year career at a US Navy research centre
West spent 42 years working at a US Navy research facility in Dahlgren, Virginia, where she became known for handling complex computations and satellite data analysis.Her work involved processing large datasets from satellite missions and building mathematical models that improved measurement accuracy. This type of research became a key part of satellite geodesy and helped strengthen the reliability of navigation systems.For much of her career, West’s name remained unfamiliar outside technical circles. Wider public recognition came later, as more attention turned to under-credited contributors in science and technology.Following news of her death, tributes highlighted her impact on modern navigation and her role as a barrier-breaking figure in STEM.West’s life story also stood out because of her dedication to learning. She earned a PhD in public administration at around the age of 70, a milestone frequently mentioned in messages celebrating her achievements.
Remembering Gladys West
Dr Gladys West was not the sole inventor of GPS, which was developed through large-scale collaboration across government, defence and scientific institutions. However, her work in modelling the Earth with high precision supported the improvements that made GPS accurate and practical.Her legacy is felt every day through modern navigation tools used in phones, vehicles and emergency services, even when users may not know the name behind the mathematics that helped make it possible.
