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Andøya is an island in the very north of Norway in the Norwegian Sea. Its remote location and surrounding mountain walls create natural shielding, preventing interference from spreading too widely, while the ocean offers a safe environment for open sea testing. These conditions make Andøya the ideal location for one of the most advanced GNSS resilience trials in the world.
Jammertest is the world’s largest open satellite signal resilience event. It brings together industry, researchers, and authorities to expose systems and equipment to real-world GNSS jamming and spoofing attacks. The goal is to raise awareness of GNSS vulnerabilities, test technical equipment, strengthen expertise across domains, and ensure regulatory readiness for a world where resilient PNT (positioning, navigation, and timing) is critical. Unlike controlled laboratory setups, Jammertest provides extreme and highly realistic conditions that can reveal weaknesses not otherwise visible.
And resilient PNT is indeed gaining importance in today’s world: this year, more than 150 organizations from 24 countries have applied to participate, with capabilities for over 250 unique tests across four dedicated sites. Each test area offers different scenarios — from a high-power jammer placed on a hillside to cover land, sea, and airspace, to remote low-power jamming sites and specialized roads for mobile testing.
Maritime, land, air, cyber, and even space is all represented with support from defence organizations such as the Finnish Defence Forces. By combining diverse participants, sophisticated threat simulations, and harsh natural conditions, Jammertest creates a rare opportunity to validate resilience strategies, find hidden vulnerabilities, and drive innovation for security and resilience.
One of our main focuses will be on evaluating how Zyntai behaves when GNSS signals are actively disturbed in a jamming or spoofing scenario. Spoofing, where false GNSS signals are broadcast to mislead receivers, is a particularly serious and difficult threat to manage. Unlike jamming, which simply overwhelms the receiver with noise to block positioning or timing signals, spoofing tries to trick the system into accepting manipulated data. So simply put, while jamming will give you “bad/no signal”, spoofing will trick you by giving you the wrong time/position.
These types of threats are not abstract. GNSS jamming has been reported in larger scale in e.g. Europe in recent times due to the war in Ukraine. Jamming can also occur in smaller scale and jamming devices, though illegal, can be bought online for a few hundred euros. Spoofing is technically more complex to do, but if done well and the changes happen gradually it can be very difficult to detect and correct, leading to severe implications for e.g. critical networks like a mobile network that depend on accurate time.
GPS interference in North East Europe, 2025-09-03 (Source: gpsjam.org)
Zyntai equipment currently in our lab, going up to Jammertest
By joining Jammertest, we want to strengthen our understanding of how jamming and spoofing can act in extreme live environments, and see how our Zyntai solution behaves when testing corner cases in hostile conditions. It’s also an opportunity to collaborate, share knowledge, and raise awareness across industries that rely on precise and secure time.
We’ll share more on our findings after Jammertest is concluded, and we’ll also have a presentation at ITSF, the world’s largest time and sync event, in Prague on October 29. So stay tuned for more info on this, we’re on site at Jammertest from September 15!
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