GPS Jamming and Spoofing: Why Planes and Phones Lose Their Sense of Place

The short version

GPS signals are so faint that a small, inexpensive device can drown them out or trick a receiver into seeing a fake location. This is not a glitch in the phone or plane; it is a deliberate attack on the Global Positioning System (GPS) and other satellite networks.

According to reporting by CNN, the jamming or spoofing of signals used in global navigation satellite systems (GNSS) is an endemic problem. The core issue is that these signals are weak by design. When a jammer broadcasts noise on the same frequency, or a spoofer sends a counterfeit signal, receivers lose their sense of place.

This guide separates jamming (blocking the signal) from spoofing (lying about the location). It explains why this matters for critical infrastructure and why civilian devices are increasingly vulnerable.

How it works

To understand the vulnerability, you must understand the scale. Over 30 GPS navigation satellites are whizzing around the world, orbiting at an altitude of 20,200 Kilometers. These satellites fly in medium Earth orbit and circle the Earth twice a day.

The system is arranged so that users can view at least four satellites from virtually any point on the planet. However, by the time these signals reach a receiver on the ground, they are incredibly weak—often weaker than the background noise of a smartphone.

This weakness creates two distinct attack vectors:

1. Jamming: This involves using a device called a jammer to overpower the weak satellite signals with noise. As reported by CNN, jamming results in the disruption of a vehicle's satellite-based positioning. The receiver simply cannot hear the satellites anymore.
2. Spoofing: This is more deceptive. Instead of blocking the signal, a spoofer broadcasts a counterfeit signal that looks legitimate. CNN notes that spoofing leads to navigation systems reporting a false location. A ship might think it is in a harbor when it is actually in open water, or a plane might believe it is on a runway when it is elsewhere.

Ramsey Faragher, director and chief executive of the Royal Institute of Navigation in London, noted that jamming and spoofing navigational signals is an "easy, straightforward shield" to protect against drone attacks. While often used for military defense, these tools are accessible and have civilian consequences.

What is sourced

The impact of these disruptions extends beyond individual phones. The Cybersecurity and Infrastructure Security Agency (CISA) defines critical infrastructure as those assets, systems, and networks that provide functions necessary for our way of life.

CISA lists sectors such as Healthcare and Public Health, Water and Wastewater, and Transportation as critical. Many of these sectors rely on GNSS for timing and positioning. For example, power grids often use GPS signals to synchronize operations.

CISA has published cybersecurity scenarios that incorporate various cyber threat vectors, including Industrial Control System (ICS) compromise. While these scenarios often focus on ransomware or phishing, the underlying dependency on GNSS makes navigation systems a potential entry point for broader infrastructure attacks.

Furthermore, stations maintained by agencies like NOAA make it possible to provide positioning products for use in surveying, construction, navigation, and mapping. When these signals are compromised, the ripple effect touches industries that require high-precision data.

Caveats

It is important to distinguish between a temporary outage and a systemic failure.

• Attribution: While CNN reports that jamming is an endemic problem, attributing specific incidents to a state actor requires official confirmation. In some contexts, such as the Strait of Hormuz, responsibility is suspected but not always officially confirmed.
• Scope: Not every navigation error is a cyberattack. Weather, terrain, or equipment failure can also cause signal loss. However, when multiple devices in a region suddenly report impossible locations (like a ship appearing on land), spoofing is a likely cause.
• Mitigation: There is no single "fix" for a consumer. While military and critical infrastructure operators are developing anti-jamming receivers, civilian phones and car navigation systems often lack these defenses.

The distinction between jamming and spoofing is critical for response. Jamming is often detected because the signal simply vanishes. Spoofing is harder to detect because the system continues to work, but it is working with false data.

What's next

As reliance on GNSS grows for everything from ride-sharing apps to financial transaction timestamps, the risk of disruption increases.

Experts suggest a shift toward fallback navigation. This involves using alternative methods—such as inertial measurement units (IMUs), cellular network triangulation, or visual positioning—to verify location when satellite signals are suspect.

Governments and industry groups are likely to increase scrutiny on GNSS-dependent infrastructure. CISA and similar bodies may issue more specific advisories on protecting critical sectors from GNSS interference.

For the average user, the immediate takeaway is awareness. If a navigation app suddenly places you in a strange location or loses signal in an area where it usually works, it could be a localized jamming event.

Going further

• GPS: How it works (NOAA) — An official breakdown of the satellite constellation and how positioning is calculated.
• Critical Infrastructure Security (CISA) — Guidance on protecting essential sectors that rely on navigation and timing data.
• GPS Jamming and Spoofing in Conflict (CNN) — Reporting on how these tactics are used in modern warfare and their impact on shipping.