THESEUS

Theseus, a San Francisco-based innovation startup focused on GPS-denied navigation, said it successfully completed a long-duration test flight of its Micro Visual Positioning System over central Florida. The company said its Micro Visual Positioning System completed a 5-hour, 22-minute flight covering about 564 kilometers during a March test in central Florida. Ian Laffey, chief executive officer of Theseus, said he flew the system with Roger O’Neill of Overhead Intelligence and that the results were strong enough to be shared publicly. He added that longer flights associated with Ukraine remain non-public, but said the Florida test now gives the company a full dataset it can provide to customers. The flight profile released by the company shows the aircraft operating between 500 and 900 feet above ground level on what it described as a representative Group 2–3 unmanned aircraft mission profile. Those categories generally cover tactical drones used for reconnaissance, targeting, and increasingly autonomous operations. The company said the system recorded a median horizontal position error of 51.95 meters over the full mission. Just as notable, the navigation package completed the flight with zero mid-flight reinitializations, meaning it stayed online for the entire sortie without needing to be reset. Images published alongside the data show the Micro VPS pod mounted beneath the wing of a fixed-wing aircraft. The released flight track traces multiple loops across central Florida rather than a simple straight-line route, suggesting the test was meant to measure performance through turns, altitude changes, and repeated course corrections. At the center of the test is a problem that has become increasingly urgent for militaries: what happens when GPS is no longer available. Recent conflicts, particularly in Ukraine, Iran, and Syria, have shown how vulnerable drones and guided systems can be when exposed to jamming and spoofing. Satellite navigation signals can be disrupted, manipulated, or entirely denied, leaving aircraft without a reliable way to determine position. Theseus is trying to solve that problem by shifting navigation away from external signals and onto the aircraft itself. Its system combines visual-inertial odometry with terrain map matching, using onboard cameras and inertial sensors to track movement while continuously comparing the terrain below with stored mapping data. In plain terms, the aircraft “looks” at the ground and matches what it sees against a known map, allowing it to keep its bearings even when GPS signals disappear. That kind of passive navigation is drawing increased attention across the defense industry as armed forces search for more resilient systems for drones, reconnaissance aircraft, and autonomous strike platforms. Another detail likely to draw interest is how little hardware the system requires. Laffey said the software can run on a Raspberry Pi 5 and be installed with a single command, pointing to a compact and relatively easy-to-integrate package. For drone manufacturers and military operators, that low size, weight, and power profile could make it easier to field on smaller aircraft where payload capacity is limited. The company also noted that this was the first flight on platform, making the results notable because they were achieved during an early operational demonstration rather than in a controlled laboratory setting. By making the Florida dataset public, Theseus now has a performance benchmark it can put in front of potential defense and aerospace customers as demand grows for systems that can keep flying when satellite navigation fails.

THESEUS

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THESEUS

Theseus tests GPS-denied navigation system over 550 km flight

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About The Defence Blog