GeoSpectrum Technologies Develops Sonar Systems for a Noisier Ocean

TECHNOLOGY SPOTLIGHT: Compact Power Beneath the Surface

BY JEREMY HULL

Modern naval power depends on more than what can be seen on the horizon. Increasingly, it depends on what can be detected beneath the surface—through layers of cold water, ambient noise, and contested ocean space.

As oceans become louder and submarines become quieter, the undersea domain is once again emerging as one of the most strategically decisive threats of the 21st century. Detection, communication, and acoustic advantage are no longer technical luxuries—they are central to sovereignty, deterrence, and operational survival.

For Canada, with the world’s longest coastline and an Arctic region growing more accessible and more contested, underwater awareness is inseparable from national defence.

One Canadian company working at the centre of that challenge is GeoSpectrum Technologies. Based in Dartmouth, Nova Scotia, GeoSpectrum specializes in underwater acoustic transducers and sonar systems—technology designed to detect sound, generate signals, and operate effectively in some of the most complex underwater environments on Earth.

For more than three decades, the firm has built surveillance systems, sonar platforms, and acoustic software for submarines, surface combatants, and uncrewed vessels, alongside a complementary line of commercial products. “Our company develops instruments designed to detect underwater sounds, as well as systems that generate sound waves in aquatic environments,” says Paul Yeatman, President of GeoSpectrum Technologies.

The company’s systems are engineered to transmit and receive signals in difficult conditions—while remaining hard to detect themselves. That balance is central to modern Anti-Submarine Warfare (ASW), underwater communications, and increasingly, Arctic operations.

GeoSpectrum’s product range spans compact systems designed for uncrewed platforms, large ship-borne installations, and custom-built solutions tailored to mission requirements. Every system is built around a simple operational truth: undersea warfare is a game of small margins, where acoustic advantage can carry strategic consequences.

BEYOND THE ‘PING’

For much of the public, sonar is still imagined as a dramatic “ping” echoing through the deep. But Yeatman says the reality of modern naval acoustics is far more nuanced—and often far quieter. “You’re doing passive surveillance,” he explains. “You don’t go ‘ping.’ You’re just listening.”

Passive sonar systems rely on extremely sensitive receivers designed to detect faint signatures while remaining silent themselves. In contested waters, being detectable can be as dangerous as being blind. GeoSpectrum’s engineering focus is shaped by that requirement: listening farther, with greater clarity, while ensuring the system remains acoustically discreet.

At the same time, the company also develops systems that transmit signals for communications, environmental monitoring, and deterrence. “We can send signals into the water that can be picked up hundreds of nautical miles away,” Yeatman explains.

That capability becomes essential in environments where surfacing is impossible. “If you’re in the Arctic and under ice,” Yeatman told CDR, “you have no other choice.”

ARCTIC SCALE, STRATEGIC DISTANCE

Nowhere is undersea sovereignty more consequential for Canada than in the Arctic. GeoSpectrum’s experience includes operations across the Arctic Basin, where its systems have transmitted signals over distances approaching 2,500 kilometres. “Those systems are sending coded pulses so that they can monitor the time of flight across the Arctic Basin,” Yeatman says.

Those measurements are not merely scientific. Temperature affects sound speed underwater, and sound speed shapes detection ranges, communications reliability, and the operational environment for naval forces. “They’ve been doing this for over 20 years now,” Yeatman notes, “and they can see how the temperature is changing in the Arctic.”

As climate change alters the Arctic’s acoustic and navigational realities, the ability to understand and operate in that space becomes a strategic requirement—not an option.

THE RETURN OF ACTIVE SONAR

For decades, ASW leaned heavily on passive listening. Today, Yeatman says, that is no longer sufficient. “Actives become more critical,” he explains, “both because the ocean is noisier and submarines are quieter.”

Active sonar—once used cautiously because it reveals the emitter’s position—is regaining prominence as adversary submarines reduce their acoustic signatures and maritime traffic increases background clutter.

GeoSpectrum has focused on making active systems smaller, lighter, and more deployable without compromising performance. “The novel thing about our active systems that are ship-borne is that they’re small and lightweight compared to others,” Yeatman told CDR.

That matters not only for crewed warships, but for the next generation of autonomous vessels. “You can have an uncrewed vessel do a job that historically you could only do on a crewed vessel,” he says.

COST AS STRATEGY

As navies modernize, procurement priorities are shifting toward systems that can be deployed faster, integrated more easily, and fielded at scale. Smaller platforms carry less payload—but cost less, require fewer personnel, and can be distributed across wider operating areas. “The smaller you can keep that particular item,” Yeatman says, “the more space you have for other important assets.”

In modern naval warfare, cost is not merely an accounting concern. It is strategic. “Warfare will tend to be cost driven,” Yeatman argues. “The guy who spends the least money is probably going to win.”

GeoSpectrum’s emphasis on reducing footprint, weight, and complexity is aimed at lowering both acquisition and operating costs—while accelerating deployment timelines. “If you’ve got a much smaller system and the costs are lower, then the approval levels are much lower, and things get approved much quicker,” Yeatman explained.

FULL-SYSTEM SOVEREIGN CAPABILITY

GeoSpectrum’s advantage is not limited to components. The company builds complete sonar systems end-to-end. It develops the software, manufactures active sources, produces receiver arrays, and assembles systems on-site—from compact listening devices to industrial-scale installations weighing up to 10 tonnes.

That breadth allows the company to serve both defence and commercial markets. One emerging commercial application is replacing air gun systems used in marine seismic surveying. “We recently did surveys in the Gulf of Mexico,” said Yeatman, “and our equipment performed very well.” Energy firms, he notes, still require seabed data, but face tightening environmental regulations. “This provides them a new way to do things that the regulators are less concerned about, which means they can go into areas they wouldn’t have been able to,” he told CDR.

Even as industry shifts from oil and gas toward offshore wind, the demand for acoustic surveying remains. “Protecting marine life and minimizing impact on ocean environments is important for a lot of people,” he adds.

WORKFORCE & GROWTH

Founded in 1994, GeoSpectrum now employs 272 people across engineering, manufacturing, program management, and field support. The company’s growth has accelerated sharply in recent years, says Megan Andrus, its marketing and communications manager. “When I joined 11 years ago, I think we were around 30 [employees],” she says. “Much of our growth has occurred within the past five years.”

GeoSpectrum emphasizes internal training and flexibility across teams. “We have a lot of in-house training,” Andrus added. “A lot of people will move to different teams depending on where the work is needed.”

The company views workforce development as inseparable from its ability to deliver complex systems and maintain customer trust.

DEFENCE OPPORTUNITY, NATIONAL IMPERATIVE

GeoSpectrum is now focused on expanding its role in Canadian naval modernization. Its expertise aligns with submarines, surface combatants, and Arctic patrol requirements, including surveillance programs tied to existing and future platforms such as the RCN’s planned River-class Destroyers.

With the Canadian Patrol Submarine Project underway, Yeatman says the company is well positioned regardless of which platform Canada ultimately selects. “Our product offers capabilities comparable to those of our competitors,” he says, “while featuring a significantly reduced weight, a more compact design, and enhanced ease of use.”

Those characteristics reduce crew demands and simplify integration on crowded decks. “There’s always a fight over real estate and topside weight,” Yeatman says. “We can meet very tight constraints without compromising on performance.”

UNDERWATER SOVEREIGNTY

In the coming decades, Canada’s security will depend not only on ships and aircraft, but on its ability to sense, communicate, and manoeuvre in the underwater domain—particularly in the Arctic and North Atlantic.

The undersea environment is where strategic competition is quietest, and often most consequential. For Canada, maintaining sovereign capability in sonar and underwater surveillance is not simply an industrial advantage. It is a national requirement.

Because in naval warfare, the first advantage is rarely the shot that is fired. It is the contact that is detected. And ultimately, the nation that can hear without being heard is the nation that controls the deep.

Jeremy Hull is CDR’s Halifax Correspondent