What Is GPS Jamming?

GPS jamming is intentional interference with GPS signals to disrupt navigation and tracking. It is typically used by external entities to create confusion, or make it difficult for vessels, aircraft, or vehicles to navigate in certain areas. This tactic can obscure movements, protect sensitive operations, or cause disruption to both military and civilian navigation systems.

Why Do Threat Actors Disrupt GPS Signals?

Threat actors, governments, and military actors interfere with GPS signals to make it more difficult for aggressors to target a certain area, to obscure illegal activities and prevent tracking, or to disrupt global trade by complicating vessel navigation.

The maritime and supply chain industries are particularly vulnerable, as ships rely on GPS for navigation, cargo tracking, collision avoidance, and emergency response. 

Jamming these signals increases the risk of accidents, delays, and security threats, especially in bad weather, or high-traffic areas. Anti-jamming technologies can help mitigate these risks, ensuring safer voyages and more reliable emergency operations.

Do Allied or Non-Adversarial Actors Use GPS Jamming?

GPS jamming is not limited to hostile entities – governments and allied forces also employ it for strategic reasons. While often associated with military actions and tactical maneuvers, jamming can also be used to protect sensitive operations, prevent surveillance, and secure restricted areas. 

However, its impact extends beyond security, disrupting civilian navigation, supply chains, and infrastructure. Recent hotspots for GPS jamming include the Red Sea, Mediterranean, Gulf of Aden, Persian Gulf, and Sudan’s coastline.

What Are the Risks of GPS Jamming

Risk Category	Description	Impact
Navigational Errors	Ships lose accurate positioning, increasing the risk of collisions or running aground.	Potential accidents, or environmental damage.
Security Threats	Criminals exploit GPS jamming to smuggle goods, or evade law enforcement.	Increased illegal activities and border security risks.
Operational Disruptions	Shipping companies face delays and inefficiencies, due to lost or incorrect tracking data.	Higher costs and supply chain disruptions.
Loss of AIS Reliability	The Automatic Identification System (AIS) becomes unreliable, reducing maritime situational awareness.	Difficulties in vessel monitoring and coordination.
Emergency Response Delays	Distressed ships may be unable to transmit accurate location data for rescue operations.	Increased risk of loss of life and property.
Financial Losses	Companies face fines, insurance complications, and reputational damage due to disrupted operations.	Higher costs and potential legal consequences.
National Security Concerns	Adversaries may use GPS jamming to disrupt military or critical infrastructure operations.	Threats to defense, intelligence, and geopolitical stability.
Cybersecurity Vulnerabilities	GPS jamming can be combined with cyberattacks to manipulate vessel tracking data.	Increased risk of digital fraud and misinformation.

Do Vessels Jam Their Own GPS Signals?

Vessels typically do not jam their own GPS signals, as this would disrupt their navigation and operational safety, not to mention the safety of all vessels in their immediate area. Vessels that do not want to be tracked engage in deceptive practices, like AIS spoofing, which falsifies location data without fully disabling GPS. 

Is Russian GPS Jamming an Issue in Today’s Maritime Environment?

Russian GPS jamming is a significant issue in today’s maritime environment, particularly in the Baltic Sea region. Multiple incidents have been reported where GPS signals have been deliberately disrupted, posing risks to navigation and safety.​

• Finnish observations: the Finnish Coast Guard reported increased GNSS jamming in the Gulf of Finland, leading to ships losing their course and malfunctions in Automatic Identification System (AIS) signals. Authorities believe Russia is behind these actions to protect its oil ports from potential threats. 
• Polish research findings: a study by Polish researchers detected 84 hours of GPS interference in the Baltic Sea, with some jamming incidents lasting up to seven hours. The evidence suggests that moving vessels in international waters are responsible for these disruptions. 
• Estonian airspace disruptions: Estonia accused Russia of jamming GPS devices in the airspace above the Baltic states, raising concerns about potential risks to aircraft navigation.

These incidents highlight the ongoing challenges posed by GPS jamming in the Baltic Sea, affecting both maritime and aerial navigation.

How Does GPS Jamming Differ From GPS Spoofing? 

GPS jamming and GPS spoofing are both forms of GPS interference, but they operate differently and have distinct impacts.

GPS Jamming

GPS jamming occurs when an external entity disrupts GPS signals by overwhelming them with noise or interference. This prevents receivers from determining an accurate location, leading to navigation failures, positioning errors, and loss of tracking.

GPS Spoofing

GPS spoofing manipulates GPS signals to deceive receivers into believing they are in a different location. Unlike jamming, which causes a loss of signal, spoofing misleads navigation systems by feeding them incorrect positioning data without immediate detection.

While GPS jamming disrupts a vessel’s ability to navigate, GPS spoofing is designed to mislead external tracking systems.

Which Technologies Are Used to Detect GPS Jamming?

Several technologies can be used to detect GPS jamming, helping vessels, governments, and security agencies mitigate its impact:

• Spectrum analyzers: monitor radio frequency interference to identify unusual signal disruptions in the GPS band.
• Jamming detection software: integrated into GPS receivers, these systems recognize anomalies like signal loss, sudden location shifts, or unexpected changes in signal strength.
• Anti-jamming antennas: specialized antennas, such as Controlled Radiation Pattern Antennas (CRPA), filter out interference to maintain accurate positioning.
• Interference monitoring networks: ground-based or satellite-based systems continuously monitor GPS signal integrity and alert authorities to jamming events.
• Multi-sensor navigation systems: combines GPS with alternative navigation methods, like Inertial Navigation Systems (INS), or celestial navigation to detect and counteract interference.
• Crowdsourced data and reporting: maritime and aviation industries share GPS disruptions to track jamming hotspots and identify patterns.

Maritime AI™ Technology Helps Detect GPS Jamming

Sometimes, what appears to be a spike in ship-to-ship (STS) meetings, or a big jump in slow-speed loitering in a specific area, is actually GPS jamming! 

Thirty two vessels were observed by Windward Early Detection conducting STS operations in China’s exclusive economic zone (EEZ) from December 9-16, 2024. This is more than triple the expected number!

The average number of vessels over the past four years is six, making the recent spike to 32 particularly notable. That volume of STS activity among passenger vessels is highly unusual. 

The anomaly of slow-speed activity off the coast of Macau and the investigation that followed, reveal a case of deliberate third-party RF interference in a “hot” area, with a level of GPS jamming never seen there before.

Suspicious incidents also occurred in Sudan, which were first flagged as a spike in slow-speed activity off the coast of Sudan but turned out to be GPS jamming. This became apparent due to artificial vessel patterns and clustering that was detected, and it makes sense in the context of the region’s geopolitics.  

How Does GPS Jamming Impact Global Supply Chains?

GPS jamming significantly impacts global supply chains by disrupting logistics, navigation, and tracking systems, leading to costly delays and inefficiencies. Ships may lose accurate positioning, resulting in route deviations, missed port arrivals, and overall scheduling disruptions. Or, they could be forced to take longer, alternative trade routes. 

Criminals can exploit these disruptions to hijack shipments or tamper with cargo tracking, increasing the risk of theft. Furthermore, the misalignment of shipping schedules can cause congestion at major ports, creating bottlenecks and longer turnaround times. Operational costs rise due to increased fuel consumption, rerouting expenses, and penalties for late deliveries. Supply chain visibility also suffers as businesses struggle to track shipments, making inventory management and production planning more difficult. 

The effects extend beyond maritime, as air and rail logistics, which rely on GPS-based tracking, also face disruptions. Insurance premiums may increase due to the higher risks involved, and companies may need to invest in alternative tracking solutions to mitigate the impact of GPS jamming.

source : windward