Sailing through the spyglass: The strategic advantages of blue OSINT, ubiquitous sensor networks, and deception

In today’s technologically enabled world, the movements of every vessel—from nimble fishing boats to colossal aircraft carriers—can be meticulously tracked by a massive network of satellites and sensors. With every ripple on the ocean’s surface under scrutiny, surprise naval maneuvers will soon be relics of the past. The vast expanse of the world’s oceans will no longer be shrouded in mystery, but illuminated by data streams flowing from millions of eyes and ears aware of every movement from space to seabed.

Open-source intelligence (OSINT) refers to intelligence derived exclusively from publicly or commercially available information that addresses specific intelligence priorities, requirements, or gaps. OSINT encompasses a wide range of sources, including public records, news media, libraries, social media platforms, images, videos, websites, and even the dark web. Commercial technical collection and imagery satellites also provide valuable open-source data. The power of OSINT lies in its ability to provide meaningful, actionable intelligence from diverse and readily available sources.

Thanks to technological advances, OSINT can provide early warning signs of a conflict to come long before it actually breaks out. On land, the proliferation of inexpensive and ubiquitous sensor networks has rendered battlefields almost transparent, making surprise maneuvers more difficult. Through open-source data from smartphones and satellites, persistent OSINT provides early warning of mobilization and other key indicators of military maneuvers. This capability is further augmented by artificial intelligence (AI)-enhanced reconnaissance and real-time data analysis, which have proven remarkably effective in modern conflicts including in Ukraine, Azerbaijan, Gaza and Israel, and Sudan. As this paradigm extends to maritime operations, it brings unique challenges and characteristics compared to land operations.

As technology races forward, Blue OSINT stands out as a key tool in the arsenal of contemporary naval warfare during global great-power competition. Blue OSINT harnesses data from commercial satellites, social media, and other publicly available sources to specifically enhance maritime domain awareness, identify emerging threats, and inform strategic decisions.

The current state of Blue OSINT across the spectrum of conflict points to an accelerating technology-driven evolution enabling maritime security and sea-control missions. The US Navy (USN) can enhance Blue OSINT collection with its own commercially procured sensor networks and bespoke uncrewed systems to shape operational environments, prevent and resolve conflicts, and ensure accessibility of sea lines of communications.

Commercially procured sensors span a wide array of technologies, including sonar and acoustic sensors, as well as video and seismic devices that are utilized to detect activities in strategic locations. These sensors can function independently or operate from uncrewed systems, providing flexibility and adaptability in various maritime operations. For instance, uncrewed aerial systems (UAS) equipped with high-resolution cameras and radar can deliver persistent surveillance over expansive oceanic areas, while uncrewed underwater vehicles (UUVs) with sonar capabilities can monitor subsea activities, such as submarine movements and underwater installations. These uncrewed platforms enable the continuous collection of critical data, enhancing the Navy’s situational awareness and operational readiness without putting sailors at risk.

For the US Navy to best support the joint force and maintain its strategic edge, it must integrate ubiquitous sensor networks and Blue OSINT into naval strategies adapted for tomorrow’s increasingly complex maritime environment. The Navy’s multiyear Project Overmatch is a good start to developing its “network of networks” and contributing to the Joint All-Domain Command and Control (JADC2) program.

With escalating tensions in the South China Sea, conventional forces are stretched thin and face asymmetric threats such as the People’s Liberation Army Navy (PLAN)’s undersea sensing arrays and China’s maritime militia forces. Integrating Blue OSINT and sensor networks into the Navy’s strategies complements traditional naval power, while allowing intelligence missions to be conducted at lower risk and cost. Moreover, the open-source nature of this information enhances the Navy’s ability to share information and collaborate with allies and partners while bypassing cumbersome security classification issues. By relying on easily shareable information, the Navy can better synchronize efforts with partner navies, making command of the sea a more coordinated and viable endeavor.

The impact of evolving open-source intelligence on warfare

The table above provides a comparison between OSINT and traditional intelligence methods, highlighting the strengths and weaknesses of each approach. OSINT offers global, real-time updates at a lower cost by leveraging existing commercial infrastructure. This approach presents a lower risk, as it involves minimal direct exposure and facilitates easier information sharing due to fewer classification issues.

On the other hand, traditional intelligence methods such as human intelligence (HUMINT) and signals intelligence (SIGINT) provide selective, targeted insights based on specific operational requirements. These methods often involve higher costs and risks due to the need for extensive human and technical resources, as well as the nature of clandestine operations. While traditional intelligence can offer deep, targeted insights, it is often limited by operational scope and security classification issues, making information sharing more challenging.

In the maritime domain, these distinctions are particularly significant. The concept of Blue OSINT integrates these principles specifically for naval operations, emphasizing the need for continuous monitoring and rapid-response capabilities.

Blue OSINT and persistent maritime monitoring

In the pre-conflict stage, global satellite coverage and social media provide a wealth of data that can map maritime activity with unprecedented detail. Nonprofit organizations like Global Fishing Watch use commercial satellite constellations to track ships and monitor maritime activity. Increased affordability and accessibility of satellite technology have enabled nongovernmental and commercial entities to contribute to maritime domain awareness in new ways. For instance, maritime radar emissions—once the exclusive domain of military and intelligence satellites—are now easily observable and “tweetable,” allowing for vessel identification to be accomplished more easily when actors execute deceptive techniques. Similarly, platforms like X (formerly Twitter) host numerous “ship spotting” accounts, where enthusiasts post photos and updates of vessels passing through strategic chokepoints and major straits, further enriching the available data.

Through persistent monitoring and large-scale data analysis, Blue OSINT can be used to significantly mitigate the challenge of monitoring large exclusive economic zones (EEZs). It offers a cost-effective alternative to traditional patrols, allowing these navies to adopt a more targeted approach when deploying their limited resources. By embracing Blue OSINT, naval forces can enhance their surveillance and response capabilities without a heavy financial burden, ensuring that these forces remain agile and effective in their maritime operations. Additionally, data streams from ubiquitous sensor networks can be coupled with Blue OSINT collection to give naval intelligence experts near-endless amounts of data in support of complex reconnaissance operations, without placing sailors and special operators at increased risk to collect it.

In addition to myriad opportunities for intelligence collection, using Blue OSINT presents technological challenges for the US Navy. The sheer volume of data generated by ubiquitous sensor networks and Blue OSINT tools necessitate substantial investments in software and analytic tools to manage and interpret this information effectively. Intelligence professionals must sift through endless amounts of data to identify actionable insights. Even the most skilled analysts need software and computer processing that can help organize and parse raw data.

To address these challenges, the US Navy and other maritime forces are ramping up investments in commercially procured sensor networks and cutting-edge analytic tools. In June 2024, the National Geospatial-Intelligence Agency issued its first-ever commercial solicitation for unclassified technology to help track illicit fishing in the Pacific. Such investments aim to access, exploit, and process the massive amounts of data generated, a key step to achieving comprehensive maritime domain awareness. Better software and analytic tools can help maximize the potential of Blue OSINT and sensor networks, ensuring that intelligence analysts can better inform decision-makers at the speed of relevance.

Strategic deployment of distributed sensors

While Blue OSINT provides valuable insights into chokepoints and shipping lanes, it does not yet offer comprehensive coverage of the open ocean. Its effectiveness is greater in populated and coastal areas, where the density of electronic devices and human activity is significantly higher than on the high seas. Moreover, OSINT data can often be easily manipulated, presenting challenges in ensuring the accuracy and reliability of the information gathered. For example, although ships emitting Automatic Identification System (AIS) signals can be tracked on the web, navies are aware that bad actors often tamper with their transponders in order to disguise their locations, ultimately limiting the signals’ reliability.

To bypass these limitations of open-source data, navies and intelligence agencies can enhance their Blue OSINT capabilities by augmenting them with strategically deployed clandestine sensor networks in key locations, such as harbors, straits, and other critical chokepoints. This combination of data flows allows for effective monitoring and data collection on vessel movements, communications, and adversary intentions. Additionally, other covert sensors can be hidden on the seabed or disguised on civilian vessels, like fishing boats, in regions such as the South China Sea. Using distributed sensors along with Blue OSINT data ensures continuous and comprehensive maritime situational awareness, even in areas less frequented by military assets.

However, fixed sensor networks alone are insufficient to cover the dynamic maritime environment. Deploying a mobile network of distributed sensors necessitates a diverse array of platforms and technologies. While military satellites, ships, and aircraft equipped with advanced sensors can offer intermittent coverage, they are costly and limited in number, and their findings are less easily shareable with partners and allies. To bridge these gaps, allied navies should invest in affordable and scalable solutions such as uncrewed surface vehicles (USVs), UUVs, and UASs. Outfitted with various sensors, these platforms can effectively detect and track adversary movements, ensuring that navies maintain situational awareness across the vast expanse of the Pacific Ocean and other critical regions.

Small UASs launched from naval ships can be used to rapidly surveil large swaths of sea, providing real-time data on both surface and subsurface activities. Recognizing the strategic advantage of uncrewed systems, China has taken a bold step to outpace the US Navy by developing an aircraft carrier specifically designed to launch and recover UASs, rather than sophisticated manned platforms like the J-20 fighter jet. This significant investment in a carrier solely for uncrewed vehicles by the PLAN should prompt the United States to reconsider, and potentially adjust, its future resourcing strategy. Similarly, USVs can conduct long-duration patrols at a fraction of the cost of manned ship operations, exemplified by Saildrone vessels patrolling the Indian Ocean, providing the USN a robust sensor network. UUVs, deployed from submarines or surface ships, can monitor subsea activities, such as the movement of submarines and other submersible assets.

By monitoring the air, sea, and underwater environments, uncrewed vehicles and their sensors can significantly enhance overall maritime situational awareness. However, these tools are only effective if they are integrated into a cohesive architecture that combines traditional intelligence, surveillance, and reconnaissance (ISR) with Blue OSINT data and affordable long-term leave-behind sensors. Project Overmatch exemplifies how to achieve this integration by developing a network that links sensors, shooters, and command nodes across all domains. For instance, Project Overmatch aims to leverage advanced data analytics, artificial intelligence, and secure communications to create a unified maritime operational picture, enabling faster and more informed decision-making. By incorporating these elements, the US Navy can ensure that uncrewed vehicles and their sensors are effectively utilized to maintain operational superiority in the maritime domain.

Moreover, the low-signature nature of some of these sensors increases the odds that they can operate undetected by adversaries, providing a strategic advantage. By deploying sensors in unexpected locations, and disguising them as civilian assets in some cases, navies can gather intelligence without alerting potential threats to their presence.

Blue OSINT and sensor networks in conflict

While Blue OSINT collection and distributed sensor networks can easily collect data in uncontested waters, they have immediate applications to modern maritime conflict as well. For instance, in the event of a cross-strait invasion by the People’s Republic of China (PRC), the transparency provided by Blue OSINT would make it difficult for navies to maneuver undetected. Satellites and social media continuously monitor naval piers, strategic chokepoints, and even some open ocean areas, making it increasingly difficult to achieve tactical surprise. Historical instances—such as Japan’s attack on Pearl Harbor, the D-Day invasion, or the successful surprise dash to transit the English Channel by the German fleet during World War II—would be much harder to achieve in the modern era due to the pervasive nature of Blue OSINT.

In the context of a potential Taiwan invasion, Blue OSINT would likely be used to detect and closely follow Chinese naval activities, including the movement of amphibious assault ships and submarines. OSINT analysts frequently examine satellite imagery of Chinese shipyards and military installations, which could provide early indications of mobilization.

However, relying solely on satellite imagery and AIS for Blue OSINT is insufficient. Multi-intelligence capabilities are essential to provide a comprehensive assessment. For instance, in 2020, two commercial firms collaborated to use radio frequency and synthetic aperture radar collection to detect Chinese illegal, unregulated, and unreported fishing near the Galapagos EEZ. This open-source technique revealed the ability to identify fishing vessels that turned off their AIS to cross into the EEZ. In a future conflict with China, the same methodology of combining multiple Blue OSINT sources could be used to identify and track vessels of the People’s Armed Forces Maritime Militia (PAFMM). This would bypass the AIS vulnerabilities that the PAFMM traditionally exploits to avoid detection, while also revealing its intentions as directed by the PLAN.

The Russo-Ukraine conflict revealed how OSINT can thwart surprise maneuvers and provide crucial targeting data deep behind enemy lines. However, it also underscores the limitations of OSINT in sparsely populated environments, such as the open ocean. For example, in December 2023, as missiles flew over the Red Sea, 18 percent of global container-ship capacity was rerouted. While civilian mariners and commercial shipping significantly contribute to Blue OSINT during peacetime, their absence in a high-risk conflict scenario would shift the burden more heavily onto satellite and uncrewed systems.

Deception and stealth

While the US Navy can take advantage of these technologies, its adversaries can, and almost certainly will, do the same. The US Navy and its allies must develop countermeasures to mitigate the risks posed by sensor networks while also leveraging its benefits. One approach is to invest in advanced deception tactics designed to mislead adversaries. These include the use of decoys, electronic warfare, and signal spoofing to create false targets and confuse enemy sensors. The Navy has been quietly developing these tools to obscure its true movements and intentions, ultimately confounding adversaries and making it harder for them to accurately target US forces.

In addition to deception, the United States and its allies need to enhance their naval stealth capabilities to evade adversaries’ distributed sensor networks. This involves not only minimizing the electromagnetic signatures of their vessels, but also employing innovative designs and operational tactics to reduce their radar cross-sections and avoid detection.

Distributed sensors in conflict

The ability to complement Blue OSINT with distributed sensors will be a decisive factor in near-term conflict dynamics. Just as frontline units in Ukraine are detected and targeted by cheap drones and stationary sensors, naval forces can be identified and pinpointed by similar systems at sea. Distributed sensors can provide continuous monitoring and data collection, ensuring that navies can maintain situational awareness and respond swiftly to emerging threats.

Three pillars are necessary to distribute sensors effectively across the ocean.

First, large conventional fleets play a critical role in maritime strategy. These fleets must be capable of extended operations and diverse missions, providing the backbone of naval presence, power projection, sea lines of communication, and, ultimately, sea control. During the COVID-19 pandemic, the US Navy demonstrated its endurance with record-length deployments, showcasing an advantage that could be significant in future maritime campaigns.

Second, organic reconnaissance drones are essential. Each destroyer and aircraft carrier should be equipped with its own fleet of multi-domain drones to conduct surveillance and gather intelligence. Currently, US carrier strike groups rely on land-launched surveillance drones, which are vulnerable and limited in number. Integrating organic drones into each vessel would enhance situational awareness and operational flexibility, allowing for more effective and autonomous intelligence-gathering capabilities.

Third, large fleets of affordable USVs and UUVs can deploy sensors across the ocean, increasing sensor hours at sea and improving maritime domain awareness. The first Replicator tranche is equipping forces with thousands of attritable systems to turn the Taiwan Strait into “an unmanned hellscape,” demonstrating the strategic value of uncrewed systems in contested waters. Moreover, the Navy is experimenting with diverse types of uncrewed platforms, aiming to create a distributed fleet architecture that is even more lethal than today’s carrier-centric fleet. These unmanned systems provide a cost-effective means to enhance surveillance and reconnaissance capabilities across vast oceanic areas, ensuring that the Navy can maintain a strategic advantage in both peacetime and conflict scenarios.

Recommendations

To maximize the efficacy of maritime domain awareness, it is crucial to integrate data from both Blue OSINT and ubiquitous sensor networks. While these two systems of data collection are largely distinct, their combined use can significantly enhance the accuracy and comprehensiveness of intelligence assessments and naval warfare.

1. Leverage Blue OSINT. Significant investment in artificial intelligence and advanced analytics is necessary to manage and interpret the endless amounts of data generated by open-source intelligence. By fostering a coordinated approach to maritime security, Blue OSINT can facilitate easier information sharing with allies and partners, but only if its utilization is preplanned. Collaborative pathways for Blue OSINT data collection, processing, and analysis must take shape early in the concept and planning phases. This collaborative effort will significantly enhance collective situational awareness and operational effectiveness, making it easier for navies to synchronize their efforts. Additionally, complementing Blue OSINT with traditional intelligence collection such as HUMINT and SIGINT provides a comprehensive threat assessment. By integrating these capabilities, navies can more easily attain a well-rounded understanding of adversary actions.
2. Commercially procure distributed sensing capabilities and networks. The US Navy must invest in Replicator-style unmanned platforms that can affordably deploy sensors across maritime battlefields, similar to the use of small UAS for land reconnaissance. These commercially procured distributed sensing platforms will significantly enhance the Navy’s ability to continuously and comprehensively monitor vast areas, improving overall maritime domain awareness.
3. Recognize a new maritime operating environment. The US Navy must prepare for protracted missions away from easily monitored ports and chokepoints while penetrating adversary-controlled, denied waters. This mission set requires a robust logistical framework capable of supporting extended deployments in remote and contested waters. By developing sophisticated tactics to deceive and confuse distributed sensor networks, the Navy can minimize its visibility to adversaries and maintain strategic surprise. This necessitates investing in advanced deception technologies such as electronic warfare, signal spoofing, and decoys to create false targets and obscure true movements. Additionally, enhancing the stealth capabilities of vessels through innovative designs and operational practices will further ensure that naval forces can evade detection and operate effectively in a sensor-saturated environment. By embracing these realities, the Navy can sustain its operational effectiveness and strategic advantage across the competition continuum.

Conclusion

In an era of distributed sensing networks and Blue OSINT, adaptation is not just about leveraging technology but also about evolving operational doctrines to meet the challenges of contemporary maritime conflicts. By integrating Blue OSINT capabilities, deploying distributed sensors, and countering (and employing) deception, naval forces can maintain an asymmetric advantage in the increasingly visible and contested maritime domain.

The success of modern naval operations hinges on the ability to swiftly adapt to technological advancements and evolving threats. Navies must transcend beyond traditional methods and embrace innovative strategies to remain agile and effective. This demands a concerted effort from all levels of naval leadership, from policymakers to forward operators, to implement these changes.

On the unforgiving sea, only those who rapidly transform to the era of Blue OSINT will avoid the abyss, with the rest risk sinking into obsolescence as adversaries gain decisional advantage. Navies that fail to adjust to the realities of Blue OSINT and sensor networks risk ending up like the Russian Black Sea Fleet: at the bottom of the ocean.

Guido L. Torres is a nonresident senior fellow with the ’s Forward Defense Program and the executive director of the Irregular Warfare Initiative.

Austin Gray is co-founder and chief strategy officer of Blue Water Autonomy. He previously worked in a Ukrainian drone factory and served in US naval intelligence.

Related Experts:
Guido Torres

Image: A PteroDynamics X-P4 Unmanned Aerial System prepares to land on the flight deck of the Arleigh Burke-class guided-missile destroyer USS Curtis Wilbur (DDG 54) on June 19, 2024. DVIDS/Petty Officer 1st Class Jesse Monford. The appearance of US Department of Defense (DoD) visual information does not imply or constitute DoD endorsement.