Quantum navigation closer to replacing GPS: Q-CTRL, Saab, Pentagon succeed

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MagNav uses Earth’s magnetic field to guide aircraft without GPS signals

Q-CTRL uses quantum gravimetry to navigate ships without satellite signals

Saab uses quantum timing to keep radar networks synchronized without GPS

Global positioning systems (GPS) have long served as the invisible backbone guiding ships, aircraft, and military operations across the planet.

That reliance now faces a genuine challenge, as adversaries increasingly jam or spoof satellite signals to disrupt navigation entirely.

Three organizations on three continents have each tested working alternatives within the span of a few short weeks.

A wave of independent breakthroughs

The combined progress of these teams suggests the technology is edging out of laboratories and into active field conditions.

The US Defense Innovation Unit, a Pentagon organization tasked with fielding emerging commercial technology for military use, confirmed a successful flight test of its magnetic navigation program, known as MagNav.

The route carried an Embraer 170 aircraft over the Pacific Ocean, running from Seattle's Puget Sound toward southern Alaska and back again.

After four hours and 23 minutes without satellite guidance, the system improved location accuracy by 89% compared to older backup navigation methods.

"This is a significant win for the department's quantum sensing priorities, showcasing that MagNav capabilities are no longer a distant research goal," said Kyle Norman, deputy director of DIU's Kill Web portfolio.

Separately, Q-CTRL , an Australian quantum computing firm, announced a maritime field trial in the Coral Sea; its quantum gravimeter kept location errors within one nautical mile across the entire mission.

That figure reportedly beat conventional satellite backup systems by more than ten times during the same test window.

"Q-CTRL's demonstration shows a credible path to accurate navigation without reliance on external satellite signals," said Steve Sklenka, a retired Lieutenant General with the U.S. Marine Corps.

The company’s founder Michael Biercuk added that the technology is ready now, calling it proof that quantum tools can already support active defense missions.

Radar networks join the shift

Saab UK also reported a milestone, working alongside Aquark Technologies and Britain's Royal Navy to test radar timing without satellite input.

Multiple Giraffe 1X radar units operating from separate locations kept a single, coherent air picture using independent quantum timing sources.

Engineers introduced deliberate timing errors to mimic jamming conditions, then confirmed the network recovered once synchronization returned.

"This trial is a great example of how collaboration can accelerate innovation," said Andy Fraser, Group Managing Director at Saab UK.

Jason Ralph, a professor of electrical engineering at the University of Liverpool, noted that gravity sensing remains the only passive alternative technology that works globally and resists jamming or spoofing attempts entirely.

The trials arrive amid rising concern over deliberate satellite interference, with roughly 978,000 jamming events recorded worldwide during the first quarter of 2026 alone, most concentrated in the Middle East.

Taken together, these three trials suggest quantum navigation is edging closer to practical deployment rather than remaining a theoretical concept.

Whether it can fully replace GPS, rather than simply back it up during outages, still depends on further testing and cost considerations.