Q-CTRL Demonstrates Ship Navigation Without GPS

Australian quantum-technology company Q-CTRL has demonstrated a navigation system that can determine a ship’s position without relying on GPS. The technology uses highly sensitive quantum sensors to detect tiny variations in Earth’s gravitational field and compare those measurements with existing geophysical maps.

The system was tested aboard the Royal Australian Navy’s MV Sycamore during a 144-hour maritime trial. Q-CTRL reported that the quantum gravimeter operated continuously while the vessel was moving and collected navigation data without human intervention. The trial was designed to demonstrate whether quantum sensing could function outside controlled laboratory conditions.

Rather than receiving signals from satellites, the system effectively uses the Earth itself as a navigation reference. Small differences in gravity across different locations create a kind of invisible geographical fingerprint. Q-CTRL’s software processes the sensor readings and matches them against gravity maps to estimate the vessel’s position.

This technology could become particularly valuable when GPS signals are unavailable or unreliable. GPS can be affected by interference, including jamming and spoofing, while conventional inertial-navigation systems can accumulate positioning errors over long periods without satellite corrections. Quantum sensing offers another independent source of positioning information that does not depend on an external radio signal.

Q-CTRL is now developing its technology for broader applications across maritime, aviation, land-based and autonomous systems. Its Ironstone Opal platform combines quantum sensors with AI-powered signal processing and map matching. The company says its goal is not necessarily to replace GPS, but to provide a resilient navigation layer that can continue operating when satellite navigation cannot be trusted.