In July, Iran made a significant attempt to hinder the operation of the Strait of Hormuz. However, this important commercial route had already seen operational disruptions due to ongoing conflicts. It was reported that over 1,100 vessels detected GPS and AIS interference in just one day. Ships were misidentified on tracking systems, showing locations at airports or within Iranian territory, which forced crews to rely on radar for navigation.
Iran’s actions highlight the vulnerability of the global satellite infrastructure. A critical point of dependence is the Global Positioning System (GPS). Everything from financial transactions, power grid operations, to navigation systems in vehicles relies heavily on GPS timestamps and signals. Designed in the 1970s, the system now carries a heavy load, and adversaries have caught up in their technical capabilities.
In recent years, jamming and spoofing incidents in global aviation have surged. In 2024, reports indicated approximately 430,000 such incidents, marking a 62% increase from the previous year. Basic jammers can be assembled from readily available parts for a modest cost, demonstrating the system’s susceptibility.
“I understand the necessity of reliable navigation in combat,” stated a former Ranger. “In the past, GPS provided critical location data seamlessly, but today’s service members face a more challenging environment.”
The fundamental weakness of GPS stems from its design, using medium Earth orbit satellites that emit weak signals. These signals are easily overpowered by nearby jammers. Military improvements like the M-Code offer only slight enhancements without addressing these core issues.
China is rapidly advancing its satellite technology, deploying next-generation low Earth orbit (LEO) constellations. These systems broadcast stronger signals and are engineered with electronic warfare in mind, providing them with a strategic advantage.
To maintain its leadership, the United States must pivot from traditional governmental projects to harnessing private industry capabilities. American companies have started launching strong navigation satellites using private funds. These satellites operate in LEO, provide much stronger signals, resist spoofing, and offer precise accuracy. They can interface with existing GPS receivers, often requiring only a software update.
The Space Force has recognized the potential of these commercial services. It has canceled plans for a government-owned “Resilient GPS” system, opting to utilize commercial solutions. The defense bill for 2027 includes provisions to test these capabilities in real-world scenarios, evaluating their resistance to interference and their ability to recover quickly from outages.
Steps to reinforce U.S. satellite navigation include:
- Funding the demonstration of commercial LEO services as specified by Congress.
- Procuring operational services from commercial providers like other essential services.
- Implementing resilience standards across critical infrastructure sectors.
Ultimately, the success of GPS has enlightened adversaries on its vulnerabilities. As Iran’s attempt at disrupting a critical strait illustrates, the signal once assumed reliable is now a target. The future of navigation will favor nations deploying resilient solutions. American industry is ready with solutions in orbit, and government actions will determine if the U.S. preserves its longstanding positional advantage.
Will Thibeau, a director at the American Military Project, emphasizes that quick government adaptation is essential to maintaining leadership in this field.
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