Few people want to get lost when traveling. But if there are places where being lost feels especially unsettling, they tend to be the sea, desert and sky. These environments share a defining feature: the absence of distinctive visual cues. Where horizons blur, landmarks disappear and every direction can look deceptively similar. Knowing where you are depends on information that you cannot see for yourself.

For most of human history, finding your way in such environments required skill, judgment and constant attention. Satellite navigation marked a fundamental shift. The advent of GPS has made navigation almost effortless: Press a button and voilà, location and heading appear instantly.

GPS’s great strength is that under benign conditions, it works remarkably well in precisely the environments where being lost would be most dangerous. Civilian systems routinely achieve meter‑level accuracy. This accuracy, however, masks a growing vulnerability.

Over the past few years, deliberate GPS interference has surged worldwide, disrupting maritime and aviation operations at an unprecedented scale. I’m an electrical engineer who studies alternative methods of electronic navigation. My lab and others around the world are developing these alternatives as backup for when GPS is unavailable or unreliable.

When GPS is silent – or lies

Jamming overwhelms weak satellite signals with noise or radio frequency signals, blocking GPS position and time altogether.

Spoofing is more insidious: Counterfeit signals surreptitiously replace authentic ones, misleading GPS receivers about location and timing while appearing to crews and automated systems to operate normally.

Interference arises from three sources: military activity, criminal exploitation and accidental misuse. In conflict zones, GPS disruption has become a routine tool of warfare, used to protect assets, degrade surveillance and counter drones. This activity is well documented across Ukraine, the Black Sea, the Baltic Sea, the eastern Mediterranean and the Persian Gulf. It routinely spills over to affect civilian ships and aircraft, and civilian life.

Accidental GPS jamming has caused serious........

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