The recent US approval of an unprecedented $11 billion weapons package for Taiwan, including HIMARS, rockets, drones, and artillery systems, has sharply elevated tensions across the Taiwan Strait. Beijing has warned the move risks driving the region toward „military confrontation and war,” while Washington views it as a necessary step to accelerate Taiwan’s defensive readiness. But amidst the political signaling and hardware debates, a deeper and more dangerous vulnerability is receiving far too little attention.
America’s Hidden Achilles’ Heel: The Dire GPS Dependence
The US remains overwhelmingly dependent on GPS for positioning, navigation, and timing (PNT). In a Taiwan contingency, that dependence could undermine US deterrence, complicate intervention decisions, and severely degrade operational effectiveness precisely when clarity and speed matter most. If Beijing chose to escalate toward armed conflict or sustained gray zone coercion, one of its most powerful asymmetric tools would not be purely naval or aerial; it would be the electromagnetic domain. Yet, the situation is not hopeless. There are immediate steps the US can take to prepare for a future conflict in China’s backyard – or risk falling critically behind at a pivotal moment.
GPS: The Invisible Scaffold of Modern Warfare, An Easy Target
GPS is the invisible scaffolding of modern warfare. It synchronizes precision strike, logistics, communications, secure network timing, intelligence tasking, and joint fires across domains. It is equally embedded in civilian infrastructure, from ports to aviation, telecom networks, power grids, and emergency services. Yet despite its centrality, GPS signals are notoriously easy to disrupt, deceive, or deny. In a conflict over Taiwan, adversaries would not need to defeat US forces outright; they could instead attack the systems those forces rely on to operate coherently.
GPS satellites broadcast weak signals to allow reception by small, low-power antennas on ships, aircraft, vehicles, and handheld devices. This very design choice makes them simple to interfere with. Relatively inexpensive ground-based or ship-based jammers can easily overwhelm GPS receivers, while more advanced spoofing systems can feed false signals that cause platforms to miscalculate position or time without obvious warning.
The Threat Is Not Hypothetical: Jamming as a Modern Reality
These are not hypothetical threats: Jamming and spoofing have already been used extensively in recent conflicts and gray zone operations, affecting both civilian and military users. The technology is proliferating, improving, and becoming more accessible. In a dense, maritime theater like the Taiwan Strait, GPS interference would be difficult to isolate and even harder to avoid. The operational consequences would be immediate. Navigation errors would ripple through air and maritime operations; timing errors could disrupt communications, data links, and networked systems; and precision munitions, ISR tasking, and logistics synchronization would all degrade. None of this requires direct attacks on GPS satellites – by targeting signals at the receiver level, adversaries can erode operational confidence without crossing clear escalation thresholds in space.
China’s Asymmetric Advantage: A Layered PNT Approach
While the US has remained largely GPS-centric, China has pursued a more layered approach. It operates a mature BeiDou global navigation satellite system and has reportedly backed it with terrestrial timing and broadcast systems, fiber-based timing networks, and high-power long-wave terrestrial transmissions. Together, these elements form a PNT architecture that does not solely rely on space.
This layered approach is most impactful close to home. In the littoral regions surrounding Taiwan, Chinese forces can likely maintain more reliable positioning and timing even under heavy electronic warfare conditions. Public reporting suggests these terrestrial and fiber-based assets extend well offshore, allowing China to operate with greater PNT confidence while actively contesting GPS in the same battlespace.
The US Operational Disadvantage: A Dangerous Asymmetry
If Chinese forces can retain accurate PNT while US and allied forces operate under degraded or deceptive GPS conditions, the result is a significant operational tempo advantage. Navigation, ISR cueing, precision fires, logistics, and secure communications all favor the side that can trust its timing and position data. This asymmetry matters profoundly in the opening phases of a crisis and in any prolonged standoff.
The Strategic Remedy: Building a Resilient „System-of-Systems”
The US urgently needs a more resilient system-of-systems approach to PNT, one that assumes disruption and deception are baseline conditions in a Taiwan contingency. At the space layer, resilience begins with multi-constellation GNSS and hardened signals. Receivers that draw on GPS alongside other satellite systems, using modern authenticated and anti-spoofing techniques, significantly increase the cost and complexity of effective jamming or spoofing.
But space alone is insufficient. A resilient architecture must include terrestrial PNT alternatives that continue to function when satellite signals are degraded or denied. High-power terrestrial systems such as eLoran and fiber-based timing grids are difficult to disrupt from orbit and can provide a reliable baseline across coastal and island environments. In the Indo-Pacific, where undersea cables are already a pressure point, terrestrial timing resilience is inseparable from broader infrastructure security.
Continuous Training and Allied Cooperation: The Keys to Success
Forces must also be able to operate through outages, not simply wait for systems to recover. Inertial navigation combined with sensor fusion (which integrates vision, radar, terrain, or celestial cues) allows aircraft, ships, and ground forces to sustain operations when GNSS is unreliable or deceptive. Another critical gap is awareness. Outside aviation and maritime safety, there is little persistent terrestrial mapping of PNT interference in many regions. Improving the ability to detect, geolocate, and share information on jamming and spoofing would enable faster mitigation and reduce the ambiguity adversaries exploit in gray-zone operations.
This effort cannot be unilateral. Allied cooperation must be central. Japan, Australia, South Korea, Taiwan, and other partners should be part of a coordinated Indo-Pacific PNT framework, with shared monitoring, interoperable systems, and targeted investment in partner infrastructure to build a regional resilience „umbrella.” Finally, technology without people is not resilience. Forces operating in the Indo-Pacific must train routinely for PNT-degraded and PNT-denied environments. Doctrine, tactics, logistics, and command-and-control must be stress-tested under these conditions well before a crisis begins.
This is not about abandoning GPS. It is about ensuring no single point of failure – in space, on land, or undersea – can determine the outcome of a crisis. The time to invest in PNT resilience is now, not after the first missile flies.
