PRC Jamming and Spoofing Endangering Shipping

On 01 December 2021 the Indo-Pacific Defense Forum reported that the deployment of satellite navigation jamming and spoofing by the People's Republic of China had spread beyond purely military use and was endangering commercial shipping and threatening civilian air navigation across the Indo-Pacific, including the South China Sea and the Taiwan Strait. The reporting framed the interference as a growing safety hazard for vessels and aircraft that depend on the Global Positioning System and other Global Navigation Satellite System signals for accurate positioning.

Two distinct strands of evidence were drawn together. First, the report cited U.S. officials and a 2021 U.S. government assessment stating that China had moved electronic jamming equipment, along with surface-to-air and anti-ship missile systems, to new facilities on artificial features of the Spratly Islands, deployments documented in commercial satellite imagery of reefs including Mischief Reef. Second, GPS spoofing documented around Shanghai in 2019 caused false positions for hundreds of vessels: MIT Technology Review reported that roughly 300 ships had their locations replaced with fake coordinates in a single day, with one ship's GPS, automatic identification system transponder, and distress signals affected without the crew being alerted.

The Maritime Executive and other maritime safety reporting described the resulting degradation of trustworthy positioning as a risk to navigation. The interference was attributed in the reporting to the PRC and its military, although the operator and exact source of the Shanghai-area spoofing were not independently confirmed.

The reporting establishes that GNSS jamming and spoofing affecting civilian shipping and aviation has occurred in and around the South China Sea, with the Spratly jammers attributed to the Chinese military by U.S. officials and documented in satellite imagery. The Shanghai spoofing is well documented as to its effect on vessels, but its operator remained unconfirmed, so PRC-state attribution there is an assessment rather than a verified fact. Treat the broad attribution to the PRC military as the source's judgment, strongest for the Spratly outposts and weaker for the commercial-port spoofing.