The war in Iran has dominated headlines with reports of airstrikes and escalating military activity. But beyond the immediate devastation, the conflict has also illuminated a quieter and rapidly growing danger: the vulnerability of ships, and the people who operate them, to disruption of their navigation systems.
Modern shipping depends heavily on GPS satellite navigation. When those signals are disrupted or manipulated, ships can suddenly appear to their navigators and to other ships to be somewhere they are not. In some cases, vessels have been shown jumping across maps, drifting miles inland or appearing to circle in impossible patterns. The risk is even higher in war zones, where ships could be misdirected into harm’s way.
As a cybersecurity researcher studying critical infrastructure and maritime systems, I investigate how digital threats affect ships and the people who operate them.
To understand the threat from GPS disruptions, it helps to first understand how GPS works. GPS systems determine location using signals from satellites orbiting Earth. A receiver calculates its position by measuring how long those signals take to arrive. Because those signals are extremely weak by the time they reach Earth, they are relatively easy to disrupt.
GPS jamming and spoofing
In GPS jamming, an attacker blocks the real satellite signals by overwhelming them with electromagnetic noise so receivers cannot detect them. When this happens, navigation systems lose their position. On a phone, it might look like the map freezing or jumping erratically.
GPS spoofing is more sophisticated. Instead of blocking signals, an attacker transmits fake satellite signals designed to mimic the real ones. The receiver accepts these signals and gives a false location. Imagine driving north while your navigation system suddenly insists you are traveling south. The receiver is not malfunctioning; it has simply been tricked.
Circular loops in the Black Sea show spoofed ship positions recorded in January 2025. The red points represent false GPS locations broadcast during spoofing events, making vessels appear to move in perfect circles on tracking maps even though they were actually hundreds of miles away. These disruptions are widely believed to be linked to electronic interference in the region during the war in Ukraine. Image created with data from Spire Global.
Anne Raymaker
For mariners at sea, spoofing can have serious consequences. In the open ocean, there are few landmarks to verify a ship’s position if GPS behaves strangely. Nearshore, the margin for error disappears: Water depths change quickly and hazards are everywhere, especially in narrow routes like the Strait of Hormuz near Iran, where reports indicate that GPS spoofing has been happening since the outbreak of the war. Because ships are large and slow to maneuver, even small navigation errors can lead to groundings or collisions.
Red Sea grounding
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