GOSAS: From Accidental Discovery to Dedicated Mission

The GNSS Orbiting Situational Awareness Sensor, or GOSAS, is a CubeSat-compatible, programmable dual GPS receiver that will operate from orbit to monitor conditions affecting space-based GNSS signals. “Understanding and predicting space weather is critical for ensuring the accuracy of GPS and the integrity of military communications,” said Scott Budzien, NRL research physicist and GOSAS principal investigator.

GOSAS is a direct follow-on to NRL’s GROUP-C experiment, which operated aboard the International Space Station from 2017 to 2023. GROUP-C’s primary mission was GPS radio occultation and ultraviolet photometry, but the experiment serendipitously detected GPS ground interference from orbit — a finding with significant implications for counterspace situational awareness. GOSAS was conceived in 2020 specifically to build on that capability, formalizing orbital GNSS environment characterization as a dedicated mission objective rather than an incidental one. The timing is notable: as documented in assessments including the Secure World Foundation’s newly released Global Counterspace Capabilities 2026, GPS jamming over conflict zones has now been shown to affect LEO satellites carrying onboard GPS receivers, creating measurable gaps in orbital PNT coverage. A purpose-built sensor for detecting and characterizing that interference environment addresses a documented and growing operational gap.

The STPSat-7 spacecraft launched at approximately 4:33 a.m. PDT from Vandenberg Space Force Base, California, aboard a Northrop Grumman Minotaur IV launch vehicle as part of the STP-S29A mission.

Companion Payloads Address Debris and Radiation Detection

The two additional NRL payloads round out a broad space environment characterization effort. LARADO — the Lasersheet Anomaly Resolution and Debris Observation instrument — will detect and characterize small orbital debris that cannot be tracked from the ground, providing data to update debris models used by spacecraft engineers, satellite operators, and policymakers. The LARADO concept dates to 2012 and has been funded since FY22 through NASA’s Heliophysics Division. GARI-1C, the third payload, will space-qualify new gamma-ray detector technology using commercial off-the-shelf components, with an eye toward future defense applications including detection of weapons of mass destruction from orbit.

The Space Test Program, operating under U.S. Space Systems Command, was established in 1966 to provide flight opportunities for research and development payloads with potential military utility. “The success of this mission highlights how cutting-edge research and development are fundamental to preserving America’s strategic edge in space,” said USSF Lt. Col. Brian Shimek, system program manager and director for STP.

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Institutional Escalation: ICAO and ITU Act

The most significant development for the GNSS community may be regulatory rather than technical. In October 2025, the International Civil Aviation Organization passed a resolution condemning GNSS interference originating from both Russia and North Korea as violations of the 1944 Convention on International Civil Aviation. The following month, the ITU’s Radio Regulations Board, at its 100th meeting, again urged Russia to “immediately cease any source of harmful interference” to safety services in the Radio Navigation Satellite Service — specifically interference affecting receivers in Estonia, Finland, Latvia, and Lithuania originating from Russian territory.

The Baltic situation had intensified steadily through the year. Lithuania coordinated a letter signed by 17 EU transport and digital ministers in June 2025 calling for a coordinated European Commission response. The European Council’s own data showed aircraft GNSS interference cases in Poland rising from 1,908 in October 2024 to 2,732 by January 2025. Estonia announced in July 2025 that Russia had moved jamming equipment to a site at Kingissepp, 20 kilometers from its border, and reported that GPS jamming had caused over €500,000 in damage in the preceding three months alone. Sweden’s Department of Transport stated that interference over the Baltic was occurring “almost daily” and had spread “both geographically and in scope.”

Active Conflict: Iran, India-Pakistan, Israel

The SWF report also documents the operational deployment of GNSS interference in three distinct conflict contexts in 2025.

During Iran’s 12-day war with Israel in June 2025, Iran jammed GPS over multiple metropolitan areas to counter drone and missile threats. Iran’s Deputy Communications Minister publicly acknowledged the disruptions were “for military and security purposes.” The Maritime Information Cooperation and Awareness Center estimated that 970 ships per day experienced GPS jamming in the Strait of Hormuz during this period, causing traffic through the Strait to drop by 20 percent as vessels limited transits to daylight hours. The report adds a technically notable January 2026 data point: during protests in Iran, Starlink ground terminals were found to have had their GPS units spoofed, causing packet losses of 30 to 80 percent. Users who switched to Starlink’s internal position estimates restored connectivity; SpaceX subsequently pushed a software update to mitigate the interference.

In South Asia, during India’s Operation Sindoor against Pakistan in May 2025, Indian electronic warfare forces were deployed specifically to interfere with GNSS signals to hamper Pakistani military aircraft navigation. The report notes that GPS spoofing has since migrated from the border zone into civilian airspace: more than 10 percent of flights in the Delhi region have reported spoofing incidents, and in November 2025 interference around Indira Gandhi International Airport was severe enough to divert flights to alternate airports.

Israel, for its part, entered into a formal commitment at the ITU in late 2025 to limit RNSS-interfering transmissions to situations involving imminent threats to life or critical infrastructure, capped at 15 minutes per incident — following a July 2025 meeting with Jordan and Egypt convened under ITU auspices.

The LEO Dimension

Perhaps the most technically striking finding for GNSS engineers: the report cites Aerospace Corporation research from July 2025 indicating that GPS jamming over Ukraine has created what researchers described as “a giant hole” in GPS coverage for small LEO satellites carrying onboard GPS receivers for position, navigation, and timing. The jamming environment over a conflict zone is now affecting space-segment PNT — not just ground users.

The Secure World Foundation’s Global Counterspace Capabilities 2026 is available here.

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VIAVI Solutions and Ground Control have announced a partnership to integrate VIAVI’s Secure µPNT STL-1000 receiver module into Ground Control’s RockFLEET Assured maritime tracking and navigation platform, targeting vessels operating in GNSS-denied or contested environments.

The Secure µPNT STL-1000 is a compact, software-defined receiver that operates through VIAVI’s SecureTime altGNSS LEO service tier rather than relying on GPS/GNSS constellations. The module delivers precise timing with holdover capability — meaning it can maintain synchronization through signal outages — and is designed for what the defense sector terms Denied, Degraded, and Disrupted Space Operational Environments, or D3SOE. Its integration into RockFLEET Assured provides a secondary, independent position source alongside or in lieu of conventional GNSS, with the stated aim of sustaining navigation and vessel oversight when primary signals are jammed, spoofed, or otherwise unavailable.

“With jamming and spoofing now a core element of cyber warfare, resilient PNT solutions are no longer optional,” said Doug Russell, Senior Vice President and General Manager, Aerospace and Defense, at VIAVI. “Its compact size and low power consumption makes it ideal for applications that require an extremely small, low-power, secure, resilient embedded PNT receiver.”

Alastair MacLeod, CEO of Ground Control, framed the integration in terms of both commercial and defense exposure. “As the frequency of jamming and spoofing continues to rise, reliance on GPS/GNSS signals alone increasingly exposes both commercial and military operations to risk,” he said. “Integrating VIAVI’s Secure µPNT STL-1000 into RockFLEET Assured delivers a trusted secondary position source, strengthening resilience for mission-critical operations across defense, maritime and critical infrastructure environments.”

RockFLEET Assured is described as a marine-grade Assured PNT (A-PNT) solution. VIAVI, headquartered in Chandler, Arizona, and traded on Nasdaq as VIAV, positions itself as a provider of test, measurement, and optical technologies across defense, aerospace, and communications infrastructure markets.

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At this year’s Munich Space Summit, something subtle—but significant—happened. What began two decades ago as a focused gathering of satellite navigation experts has merged with the faster-moving world of NewSpace. The NewSpace policy and industry concept marks a major shift in how the space sector works, transitioning from a government-driven sector to a more commercial, innovation-driven ecosystem, involving private companies, startups, and new business models.

The new Munich Space Summit, combining the Munich Satellite Navigation Summit and the Munich NewSpace Summit, clearly highlighted this shift and what it means for Europe’s space model and its vision for PNT. 

Bringing the Message Home

Bringing NewSpace into the fold means adding some of that agility to the deeply rooted PNT community. The PNT portion of the program brought together top space leaders to discuss how policy, programs and NewSpace pep can help them face pressing global challenges. Florian Hermann of the Bavarian State Chancellery offered some rousing opening remarks, referring colorfully to Germany’s significantly increased space-related spending. “Even in the mainstream in our society,” he said, “people know that we are facing something like a gold rush in space.” The country’s new budget marks a clear political shift toward space as a strategic, economic and security domain.

This joining of hands comes at a moment of intense concern about European defense and security, as war, geopolitical shifts and other threats converge, making Europe feel less secure than at any point in decades. Responding to that concern is the European Commission (EC), here in the form of Christophe Kautz, Director of Satellite Navigation and Earth Observation at DG DEFIS: “Let me be concrete about the new priority on which we are working. The Commission has developed quite large defense programs, and some of that is also going toward space. But in addition to that, we are also adapting what we already do with our space programs.”

Kautz described the EC’s proposal of a major new funding framework to boost Europe’s competitiveness. The Commission envisions a dedicated “space and defense window,” meaning a targeted funding stream for space infrastructure and defense capabilities. There will also be a focus on startups and SMEs, defense tech, as well as industrial scale-up and innovation.

“We’ve laid out what we want to do in the next finance period,” Kautz said, “…We are complementing our existing GNSS services, where we had a focus on the civil side, to make them also workable, or to tune them, toward the security and defense user.”

LEO PNT, he said, is the future and “can also be very useful for security and defense applications. When it comes to Earth observation, of course we’ve had Copernicus for many years, but we want to complement it with what we are calling an Earth observation governmental service, a PRS-like service in the realm of Earth observation.”

The EC is also hard at work on its new IRIS² communications initiative. “And we will have space surveillance and tracking,” Kautz said, “so we’re trying to tune our service portfolio toward security and defense.”

Forces at Play

ESA General Director Josef Aschbacher started his presentation on a positive note: “I just landed this morning from Washington D.C. where yesterday the new NASA administrator was announcing his vision of a Moon architecture, the Moon ecosystem, which is very interesting and where ESA has a lot of participation.”

On the changing geopolitical environment, his tone hardened. “The things we are seeing,” he said, “are drastically changing the landscape of space. We had a very successful [ESA] ministerial conference in Germany last November, and this was really Europe’s collective response to the new geopolitical reality. On the eastern side, of course, we have the war in Ukraine, on the western side we have the United States and the new geopolitical context in which we are living. My message to all the ministers of our ESA countries was Europe has to be stronger, more autonomous and self-reliant, and therefore we need space programs across the board where we are increasing our strength and capacity.”

At the Ministerial Council, member states agreed not only on a record budget of about €22 billion for 2026 to 2028, but also on a “clear defense and security mandate,” something ESA has traditionally avoided.

“We are working closely with the European Commission, and in general, we really want to build up the space economy,” Aschbacher said. “Europe has to change, we have to become faster, we have to rely on the ingenuity of our small and medium-sized enterprises.”

The European Union Agency for the Space Program (EUSPA) Executive Director, Rodrigo da Costa, expressed his approval of the new format. “In this new geopolitical situation, the response of the space sector is very important, to operationalize all of the space services for the security dimension, for the governmental users, which can be of a military nature.

“Our key focus,” he said, “has always been on how to serve a maximum amount of people, and I think we are there. The security users add another dimension, because they will be building key missions, key operations based on the services that we provide. This is required. As an ecosystem, as a sector, we are changing our focus, to serve this very particular set of users.”

Challenges Enumerated

Kautz reminded attendees it’s not going to be easy: “We have great ideas, and sometimes we are quite good at transforming these into something concrete. We do have some extremely good systems, but there are gaps. We do not have the investment power that they have in other parts of the world. This is linked perhaps to the way we are structured in Europe, some things that inhibit our investment capabilities. We are working on this.”

The European Investment Bank (EIB), launched a dedicated space financing initiative to support Europe’s space industry. The strategic fund mobilizes private and public capital behind space technology, infrastructure and companies.

“So there is some movement,” Kautz said, “and this is something that we need, to help turn our ideas into economic reality. I think we also have issues related to our regulatory environment. At least from the Commission’s perspective, we think we need an internal market for space. The proposed Space Act should lead us into this direction.” The EU Space Act, expected to take effect in 2030, sets unified rules for space activities, boosting investment, innovation, and strategic autonomy across Europe’s space sector.

Aschbacher added another complaint to the list: “We are fragmented. We are 27 EU countries, more than 20 ESA member states. We have to join forces, especially when we are under pressure.”

Aschbacher will be aware of recent reports suggesting Germany and possibly Italy may pursue their own national systems for sovereign communications, essentially duplicating the capabilities of the EU’s IRIS², which is aimed at providing shared secure connectivity.

“We seem to be going in the wrong direction,” he said. “The time is critical. If we go too far, in not linking up these different systems, it will be too late.”

Still Competitors, Still Collaborators

From across the great water, a lone American said his country still holds some security-related priorities in common with its allies. An old friend of the conference, Harold “Stormy” Martin is Director of the National Coordination Office (NCO) for Space-Based PNT within the U.S. Government. He assured the audience that while, “the world situation is not beautiful right now, President Trump’s PNT policies make it clear that the U.S. takes GPS jamming and GPS spoofing very seriously. We’re developing interference mitigation and detection measures.”

The event highlighted how NewSpace energy—speed, innovation, SME participation, and flexible architectures—is reshaping Europe’s space model and strengthening its vision for Galileo, LEO PNT and a more resilient space infrastructure designed to support economic growth, service continuity, and greater confidence in critical operations.

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The AsteRx EB is aimed at industrial robots, port logistics, marine platforms, and scalable automation systems — markets where accuracy requirements are demanding but where the volume economics of a high-end OEM module may not be practical. The IP67-rated housing protects against weather and dust, and the compact enclosure is designed to reduce installation time and simplify integration.

On the positioning side, the receiver incorporates Septentrio’s GNSS+ algorithms for performance in environments that challenge standard GNSS — foliage, urban multipath, proximity to interference sources. In a dual-antenna configuration, it delivers sub-degree heading alongside RTK-level positioning, covering applications that require both location and orientation. The AIM+ anti-jamming and anti-spoofing technology is built in, addressing the growing priority of interference resilience in industrial and autonomous systems.

“AsteRx EB is an ideal boxed receiver for customers who need reliable, resilient, and highly accurate positioning in a compact form factor and at a price point that makes rapid scale-up possible,” said Danilo Sabbatini, Product Manager at Septentrio.

The AsteRx EB slots into Septentrio’s enclosed receiver lineup between the mosaic-go evaluation platform and the AsteRx RB3, which is positioned for applications requiring the highest level of mechanical and environmental protection. Septentrio notes the EB can also serve as an evaluation platform for integrators assessing its positioning technology before committing to a production architecture.

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The i700 draws on the sensor architecture and electronics of Honeywell’s HG3900 IMU, which the company introduced in June 2025 as a next-generation MEMS-based tactical-grade unit. The HGuide version trades the HG3900’s broader dynamic range for a constrained acceleration and spin-rate envelope optimized for longer-range navigation in GNSS-denied and GNSS-challenged environments — a profile suited to UAS, unmanned ground vehicles, unmanned surface vessels, and stabilized payloads operating without reliable satellite positioning.

The no-license-required classification is the product’s primary commercial differentiator. Export-controlled inertial systems require government authorization that adds time and complexity to integration programs, particularly for international customers and commercial developers working across multiple markets. By limiting the i700’s performance envelope to remain below export control thresholds, Honeywell is positioning it as a drop-in option for integrators who need near-navigation-grade inertial performance without the procurement friction of a controlled part.

“The HGuide i700 offers strong GNSS-denied performance by limiting maximum acceleration and spin rates in a license-free package that simplifies the complexity of system development while preserving reliability,” said Matt Picchetti, vice president and general manager, Navigation and Sensors, Honeywell Aerospace.

The i700 joins the HGuide i300 and i400 in Honeywell’s no-license inertial product line, extending the suite’s ceiling toward navigation-grade performance. Honeywell describes the unit as suited to mobile mapping and surveying systems, robotics and industrial automation, and long-duration unmanned ground and surface platforms in addition to aerial applications.

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Organized by Defense Strategies Institute, the summit will bring together leaders from the military services, federal government, industry and academia to examine how the United States can strengthen a PNT enterprise that remains essential to military operations, civil infrastructure and commercial activity. The agenda reflects both urgency and breadth: military PNT overmatch, GPS modernization, space resiliency, multi-layered architecture and the need to counter threats to trusted PNT services.

That matters because GPS remains foundational to how the nation functions. It underpins battlefield maneuver, navigation and precision effects, while also supporting power grids, telecommunications networks, transportation systems, financial markets and civilian navigation. But reliance on a single source also creates vulnerability. The summit is designed to address that challenge directly, with attention not only to protecting GPS, but also to advancing complementary and alternative sources of PNT that can sustain operations when signals are degraded or denied.

Dana Goward, moderator of the summit and a longtime advocate for resilient PNT, says the conversation has become more urgent as recent events have made clear just how contested the signal environment has become.

“The ongoing conflict in the Middle East certainly underscores what we’ve seen in the Baltic, what we’ve seen in Ukraine and other conflict areas around the world,” Goward said. “We need to take lessons about the possibilities here in the homeland and the possibilities around the world for civil infrastructure and commerce.”

That broader lens is one of the most important aspects of this year’s event. While assured PNT is often discussed through a military lens, Goward argues that the implications are much wider. The same vulnerabilities that affect warfighters can also affect ports, communications, logistics, energy systems and the broader economy. In that sense, the summit is not simply about protecting a battlefield capability. It is about strengthening a national foundation.

The event will also highlight a point that Goward returns to often: the challenge is no longer just technological. It is also institutional.

“Governance is going to be one of my themes in the program,” he said.

That emphasis is especially timely. The summit’s sessions are expected to explore both mature and emerging technologies, but Goward argues that the United States already has access to many of the tools it needs. The larger issue is alignment: defining requirements properly, coordinating policy and making sure leadership is focused on building a resilient architecture rather than assuming GPS alone is enough.

“I would hope that attendees get an understanding that we need to start taking lessons for the homeland, for our infrastructure and all of our civil applications from what’s happening overseas,” Goward said. “Unlike our major adversaries, we have no complementary and backup capability.”

He added that the reason is “primarily a lack of leadership focus and getting governance process right.”

That message gives the Assured PNT Summit its real significance. This is not just another technical meeting about signal performance or component roadmaps. It is a forum for connecting policy, military requirements and infrastructure resilience in one conversation.

Goward also stresses that complementary systems should not be seen as an argument against GPS. In his view, they are a way to strengthen it.

“GPS is great,” he said. “It’s going to be around for a long time. We’ve got to get the bullseye off of it, and we’ve got to protect the users in the event something happens.”

He argues that resilient PNT will require a systems approach, one that blends space-based services with terrestrial and timing-based capabilities. That is why the summit’s agenda, with its focus on layered architecture and resilience, is likely to resonate well beyond the defense community.

Another theme likely to draw attention is the need to define requirements more intelligently. As Goward puts it, users should not confuse a tool with a requirement.

“My PNT requirement is GPS. Well, no,” he said. “Your requirement is articulated in terms of accuracy, availability, continuity and so forth.”

That distinction may prove central to the discussions ahead. The future of assured PNT will not be determined only by whether individual systems work in isolation, but by whether the nation can build an architecture that continues to support security, infrastructure and commerce under stress.

For attendees, that makes the summit especially relevant. It offers a chance to hear from senior leaders, evaluate the state of current solutions and engage in a more mature conversation about what national resilience in PNT really requires.

Registration is now open. Active-duty U.S. military and government employees may attend on a complimentary basis.

Visit pnt.dsigroup.org for more information.

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VectorNav Technologies today announced 90G and 250G accelerometer and 4000°/sec gyroscope ranges across its Tactical Series inertial measurement unit (IMU) and inertial navigation system (INS) product line. The enhancement directly addresses urgent requirements from defense contractors and platform developers operating in high-G mission profiles.

Defense modernization priorities are accelerating procurements of interceptors, missiles, and hypersonic platforms that must operate through launch, interception, and aggressive maneuvering—often in environments where GPS is denied or degraded. In these conditions, navigation performance depends on the IMU’s ability to maintain solution integrity without saturating. The extended-range Tactical Series is designed to meet that requirement, providing the core inertial measurements that enable resilient position, navigation, and timing (PNT) solutions to operate through mission-critical flight phases where conventional sensors fail.

“The demand signal from our customers has been unmistakable,” said Jakub Maslikowski, VP of Business Development. “As platforms become faster, more maneuverable, and face increasingly sophisticated threats, high-performance inertial navigation solutions are needed at scale to meet the evolving demand. With nearly 20 years supporting these mission profiles, we know these applications—and the extended-range gyro and accelerometer will enable faster integration and more rapid fielding of reliable systems.”

–  High-speed interceptor platforms

–  Rapid-response strike systems

–  Hypersonic and advanced maneuvering vehicles

–  Counter-UAS and air defense systems

The extended-range accelerometer and gyroscope are available across the full VN-110 IMU and VN-210 / VN-310 INS product family, supporting applications including:

Next-generation precision guidanceThe extended-range configurations are drop-in compatible with existing platforms—no changes to form, fit, or function—enabling immediate upgrades without redesign.VectorNav systems are designed, manufactured, and tested at the company’s AS9100-certified Dallas facility, where the company currently produces tens of thousands of units annually. As demand for resilient PNT continues to accelerate globally, VectorNav is expanding production capacity in 2026 with a new 100,000 sq. ft. facility to support high-volume programs and R&D efforts.Engineering units of the enhanced Tactical Series are available now for immediate test and evaluation. For technical specifications, integration support, or procurement information, contact sa***@*******av.com or visit vectornav.com.

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Designed for land, air, and marine platforms, Stellar-40 integrates a tactical-grade IMU, a GNSS receiver, and advanced sensor fusion algorithms within a compact and rugged enclosure. The system is developed to provide reliable navigation performance in high-vibration, high-dynamics, and electronically challenging environments.

The development of Stellar-40 focused on two main objectives, increasing resilience in harsh operational conditions and improving production scalability. To overcome the vibration sensitivity commonly encountered in defense and industrial applications, SBG Systems implemented an innovative three-level mitigation approach:

• Sensor-level isolation: dampers integrated directly at the IMU sensor level reduce vibrations at the source.
• Resonance-free enclosure: a specialized housing engineered to drastically minimize resonance and internally induced vibrations.
• Structural isolation: custom external dampers designed to isolate the unit from harsh vehicle dynamics.

This architecture supports stable system behavior in dynamic environments.

Beyond mechanical robustness, Stellar-40 addresses modern electronic warfare challenges. The system incorporates a high-performance GNSS receiver designed to actively mitigate advanced jamming and spoofing threats. When GNSS signals are degraded or unavailable, the system relies on multi-sensor fusion and dead-reckoning capabilities to maintain navigation continuity.

Positioned as the heavy-duty counterpart to Ekinox Micro, Stellar-40 introduces a revised mechanical and electronic design intended to simplify integration and manufacturing processes. The system is suited for defense programs, robotics platforms, UAVs, and autonomous systems requiring compact, scalable navigation solutions.

Kaoutar, Product Manager at SBG Systems, comments:

“Stellar-40 was developed with scalability and integration flexibility as key priorities. The design aims to support a broad range of platforms while keeping large-scale production in mind. This product brings high-end resilience against vibrations, jamming, and spoofing into a box that teams can completely trust in real-world operations.”

With the introduction of Stellar-40, SBG Systems continues to expand its range of inertial navigation solutions for professional and industrial applications.

For more information about Stellar-40, visit www.sbg-systems.com/ins/stellar-40/

Applications Across Industries

Stellar-40 is designed for a wide range of applications across defense and autonomous systems. It supports platforms such as UAVs, robotics, and other autonomous vehicles that require compact and scalable navigation solutions. Its revised mechanical and electronic design simplifies integration and manufacturing, making it well suited for both large-scale production programs and demanding operational environments.

Availability

Stellar-40 will be commercially available worldwide in June this year. 

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The U.S. Space Force has reassigned the launch of the final GPS III satellite to SpaceX, citing the need to maintain delivery timelines for critical positioning, navigation and timing (PNT) capability while United Launch Alliance (ULA) investigates issues with its Vulcan rocket.

According to a statement from Space Systems Command, the GPS III-8 mission—carrying Space Vehicle 10 (SV-10), the final satellite in the GPS Block III series—will now launch aboard a SpaceX Falcon 9 no earlier than late April 2026. 

The mission had previously been manifested on ULA’s Vulcan Centaur.

Timeline pressure drives launch reassignment

The decision reflects a continued emphasis by the Space Force on assured and timely delivery of modernized GPS capability, particularly as the Block III series approaches completion. GPS III satellites introduce improved accuracy, anti-jam performance through M-code, and enhanced signal integrity for both military and civil users. 

Officials framed the move as part of a broader “launch provider exchange” strategy within the National Security Space Launch (NSSL) program, leveraging the fact that GPS III spacecraft are certified to fly on multiple vehicles. 

This flexibility has been exercised repeatedly over the past two years. Earlier GPS III missions—including SV-09, launched in January 2026—were also shifted from Vulcan to Falcon 9 to maintain schedule continuity. 

Vulcan anomaly under review, not a program reset

The reassignment follows ongoing investigation into anomalies involving Vulcan’s solid rocket boosters, observed during recent flights. While those missions achieved orbit and met primary objectives, the Space Force elected to pause Vulcan’s use for national security launches pending further analysis. 

Importantly, the move does not signal a broader departure from ULA within the NSSL architecture. As part of the exchange, Vulcan is now slated to support the USSF-70 mission, currently projected for 2028. 

ULA remains a core provider in the dual-lane launch strategy, with dozens of missions still assigned over the coming years.

Closing out the GPS III baseline

The SV-10 launch will complete the initial GPS III tranche, a 10-satellite modernization effort led by Lockheed Martin. 

With nine spacecraft already on orbit—including the most recent SV-09 launched earlier this year—the final mission represents a transition point toward the next-generation GPS IIIF series, which is expected to introduce further enhancements in regional military protection and search-and-rescue payloads.

For the Space Force, the immediate priority remains clear: maintaining continuity of PNT services and accelerating deployment timelines where possible.

That approach has increasingly relied on responsive launch practices and provider interchangeability—an operational model demonstrated across multiple recent GPS III missions and now extended to the program’s final satellite.

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