On July 14, 2026, Australia's Q-CTRL announced that its quantum magnetic navigation system "Ironstone Opal" had passed environmental qualification testing for flight safety based on RTCA DO-160. The company claims this is a world first for quantum navigation, and will exhibit the actual device at the Farnborough International Airshow, which opens on July 20. The device, which demonstrated in 2025 that it could calculate position aboard a Cessna aircraft, has now become a candidate for aircraft installation, having withstood vibration and electromagnetic interference. However, DO-160 compliance does not mean product certification or operational approval by aviation authorities. The competition in quantum navigation has shifted from whether it can measure accurately to whether it can be safely integrated into existing flight control and navigation systems.
From Experimental Device to Installation Candidate via DO-160
What Ironstone Opal aims for is backup navigation that limits errors in inertial navigation systems (INS) when the Global Navigation Satellite System (GNSS) is jammed. In 2026, EASA and EUROCONTROL incorporated into their action plan the standardization of operational procedures and development of jamming-resistant avionics, citing the increasing normalization of GNSS jamming and spoofing around conflict zones. Even when GNSS is disrupted, aircraft do not immediately become unable to fly. However, route flexibility and operational continuity are compromised.
DO-160 is a standard test that exposes aircraft-mounted equipment to changes in temperature, altitude, and vibration to verify it operates as expected. It also tests resistance to power fluctuations and radio frequency interference. The FAA's AC 21-16G treats DO-160G as an acceptable means of demonstrating compliance with specific airworthiness requirements. Even if good results are obtained in a laboratory or test aircraft, the device cannot be adopted if it breaks in-flight or disrupts other electronic equipment. This pass represents one step forward in the productization sequence.
The boundaries are also clear. RTCA itself states that it does not certify products, and what DO-160 verifies is environmental qualification. Q-CTRL's announcement does not specify which version of DO-160 was applied or which test categories were used. The testing organization and test report are also unclear. It would be premature to interpret "airworthiness-qualified" as obtaining an airworthiness certificate. In addition to software and electronic hardware assurance, installation approval for each specific aircraft is also required. Certification work continues, including fault indication and switchover systems.
Q-CTRL also announced a model for unmanned aerial vehicles weighing under 1kg, in addition to versions for manned aircraft. The company states that sensors can be placed inside the fuselage or in the wings, and emphasizes that it is not subject to ITAR export controls. If the device can be made this small, it can be brought into evaluation without major modifications to existing aircraft. However, specifications for power, wiring, and connection to navigation databases have not been disclosed at this time. How it would be integrated into a Flight Management System also remains unclear.
Picking Up 10-100nT of Geomagnetic Signal from Aircraft Noise
Ironstone Opal uses irregularities in the magnetic field created by the Earth's crust as a geographic fingerprint. Compared to the core magnetic field that accounts for most of Earth's magnetic field, the crustal anomalies used for navigation vary by only about 10-100 nanotesla (nT) within a range of several kilometers. By matching pre-prepared magnetic anomaly maps with in-flight measurements, current location can be narrowed down without transmitting or receiving radio signals to satellites or ground beacons. Because it lacks the same radio signal attack surface as GNSS, its strength is that it can be used at night or in clouds.
What makes it "quantum" is a scalar magnetometer that measures the magnitude of the magnetic field. According to Q-CTRL's 2025 technical paper, the sensor head contains a cell filled with buffer gas and rubidium atoms, and reads atomic spin precession using light. Sensitivity is reported at below 80 fT/√Hz, with a bandwidth of 250Hz. The sensor head is reported to weigh approximately 70g, occupy 144 cubic centimeters in volume, and consume less than 15W of power.
The entire navigation system is not composed of quantum devices. The minimum configuration combines a quantum scalar magnetometer with a classical vector magnetometer and an INS. Aircraft velocity information and magnetic maps are input into this system, and location is calculated using map-matching software. During the demonstration, the hardware occupied 4.2 liters. Because INS integrates acceleration and angular velocity, errors accumulate over time without external position correction. The mechanism periodically obtains matches with the magnetic map to reset this error to within a certain range.
The difficulty lies not so much in magnetometer sensitivity as in magnetic noise generated by the aircraft itself. Magnetic fields produced by avionics, wiring, and motors can be larger than the crustal landmarks being sought. Changes in aircraft attitude also disturb the measurements. Q-CTRL addresses this by simultaneously reading both scalar and vector magnetometers and using a physical model to learn the aircraft's specific magnetic field characteristics during flight. Rather than calibrating with predetermined turns, the design updates coefficients even as payload or latitude changes—this is precisely the company's key technical asset.
The 22m Measurement and RNP 0.3 Are Separate Test Results
The most detailed publicly available data comes from a preprint submitted to arXiv by Q-CTRL researchers in 2025. That year, using a Cessna 208B Grand Caravan around Griffith, Australia, they flew over 6,700km in one week. Maximum altitude was 19,000 feet. GNSS during testing was used to record the ground-truth position and was not input into navigation calculations.
The smallest final error was 22m, from a test flight covering 365km. This corresponds to 0.006% of distance traveled, representing an error 15 times smaller than a strategic-grade INS aided by 3D velocity. In the test with the largest relative difference, using a quantum magnetometer mounted outside the wing, error after a 420km flight was kept to 112m, recording a 46-fold improvement over INS. Even with sensors mounted inside the aircraft, multiple flights reportedly achieved errors 11 to 38 times smaller than INS.
In this announcement, Q-CTRL explains that new flight verification maintained accuracy equivalent to RNP 0.3, meaning error under 0.3 nautical miles for 95% of flight time. 0.3 nautical miles equals 555.6m. This appears looser than the best value in the 2025 paper, but RNP does not measure a single final error point—it evaluates continuous performance during flight staying within a specified range. The two measurements have different meanings.
Furthermore, under FAA definitions, RNP requires onboard performance monitoring and alerting in addition to accuracy. Test results showing 95% containment within 0.3 nautical miles are strong evidence, but this alone does not mean the device has been approved as equipment usable for RNP operations. Q-CTRL has not disclosed the distribution of position errors by flight path, monitoring and alerting logic, or independent verification reports on this occasion. The 2025 figures of 22m and 46-fold improvement, and the 2026 claim of achieving RNP 0.3, should be read as separate test results.
"World First" Refers to DO-160; Quantum Navigation Is Already in a Competitive Stage
Flight testing of quantum navigation itself has precedents. In 2024, the UK government announced that Infleqtion, BAE Systems, and QinetiQ had mounted core components of a quantum inertial sensor using optical atomic clocks and ultra-cold atoms on an RJ100 test aircraft. This is a different system that uses atoms to measure acceleration and time with high precision, reducing INS drift. It differs both in principle and required infrastructure from Ironstone Opal, which matches against geomagnetic maps.
Quantum magnetic navigation also has competitors. Airbus's Silicon Valley base Acubed announced in 2025 that it flew 150 hours in a Beechcraft Baron equipped with SandboxAQ's AQNav, conducting tests connecting 200 airports across the continental United States. It reportedly satisfied cruise RNP requirements in all scenarios, with best positional accuracy under 74m. Airbus itself also revealed in 2026 that it is evaluating the robustness of magnetic anomaly navigation.
Therefore, what Q-CTRL claims as "world first" refers to DO-160 environmental qualification—not the first flight of quantum navigation, nor the first demonstration of quantum magnetic navigation. This qualification does not diminish the achievement. In the aviation market, the very shift from a research stage competing on best-case error figures to a stage completing environmental testing and airframe integration while establishing supply chains represents progress toward commercialization. Q-CTRL states it has continued evaluation with Airbus since 2024 and is also collaborating with Lockheed Martin in the defense sector, but has not disclosed airline adoption or entry-into-service timing.
Next Hurdles: 3km Maps, Ocean Operations, and Altitude
Magnetic navigation differs in character from GNSS, which delivers the same accuracy worldwide simply by distributing receivers. In regions with sparse crustal magnetic patterns, position becomes harder to narrow down, and map resolution and survey quality determine performance. According to the 2025 paper, publicly available global magnetic maps have a resolution of 2 arcminutes—approximately 3km—with limited ocean data. Some maps have fixed reference altitudes such as 6km, and errors are larger in regions where old surveys predating widespread GNSS adoption have been integrated.
The paper acknowledges that additional verification is needed at commercial airliner cruise altitudes and for highly maneuverable military aircraft. Ocean areas, where magnetic anomalies are smaller than over land, present another challenge. Strong solar activity could potentially mask crustal magnetic patterns as well. While Q-CTRL's 2026 announcement claims verification across land, sea, and air, the published paper does not include flight paths or error data from ocean testing. Global deployment requires operational design determining who updates navigation magnetic maps and how they are distributed to aviation databases, in parallel with sensor mass production.
What should be confirmed at Farnborough is not the exterior of the exhibited aircraft but the substance of the test evidence. If the DO-160 test category and report are released, the scope of environmental qualification can be assessed. In addition to RNP verification including performance monitoring and alerting, connection methods to Airbus aircraft and delivery timing to customers would also serve as material for measuring the distance to implementation. When these connect to approval pathways from aviation authorities and airframe manufacturers, quantum magnetic navigation will transform from a research-stage GPS backup into a redundant system that airlines can incorporate into their operational planning.