Global shipping is operating in a more volatile and contested environment than at any point in recent decades. Rising geopolitical tensions across key maritime corridors, including threats to vessels transiting strategic waterways and continued disruption to energy and export routes, are reinforcing a familiar reality: the sea lanes that underpin global trade are not always stable or predictable.

Read also: Shipping Faces New Threats as Conflict Widens in Iran Wars

At the same time, operational and commercial decision-making across the shipping industry is becoming more closely tied to how risk is assessed and understood. It is not only the presence of risk that matters, but the degree of confidence operators and stakeholders have in the data used to evaluate and manage it.

Despite these pressures, there are clear mitigation pathways. Few technologies have reshaped maritime navigation as fundamentally as satellite positioning. Over the past three decades, Global Navigation Satellite Systems (GNSS) have evolved from specialist tools into core infrastructure supporting modern shipping and global supply chains. They underpin everything from long-haul route planning to dynamic positioning and complex port approaches.

That success, however, has also contributed to a broad assumption across the sector that satellite signals will always be available and dependable. Recent developments suggest that assumption is becoming harder to sustain. This is where Assured Positioning, Navigation and Timing (APNT) becomes increasingly important, providing greater confidence in vessel positioning and supporting more informed risk management.

Disruption to GNSS is being reported with growing frequency in regions that are central to international shipping and naval activity. Interference across the Black Sea, Baltic, and parts of the Eastern Mediterranean has shown that vessels can encounter unreliable or manipulated navigation signals. Ships operating in these areas have reported position anomalies, sometimes appearing miles from their actual location. For crews navigating congested waters or preparing for port approaches, this introduces real uncertainty.

These incidents are often concentrated along strategically sensitive routes where commercial shipping, naval operations, and energy flows intersect. As these corridors become more contested, the reliability of the navigation systems guiding vessels through them is coming under closer scrutiny.

The operational impact

Accurate positioning and timing sit at the core of modern maritime operations. Commercial vessels depend on precise PNT data for electronic charting, automated safety systems, route optimization, and offshore activities. Defense platforms rely on the same signals to coordinate maneuver, maintain situational awareness, and synchronize communications. As onboard systems have become more digitized and interconnected, dependence on satellite positioning has extended well beyond navigation alone.

When disruption occurs along major trade routes, the consequences extend beyond immediate navigational safety. Tanker traffic, container flows, and global energy supply chains all rely on predictable maritime operations. Uncertainty around a vessel’s position in contested areas can quickly ripple through supply networks. It can also make it more difficult to assess exposure with confidence, often leading to more cautious operational decisions and a greater reliance on assumption where verified data is limited.

This level of dependence means GNSS disruption can affect multiple onboard systems at once. A degraded or manipulated signal does not simply alter a position reading on the bridge. It can also introduce uncertainty into automated processes that rely on the same underlying data. In an operational environment that is increasingly data-driven, the integrity of that information becomes as important as its accuracy.

From reliance to resilience

For the shipping industry, the question is no longer whether satellite navigation is essential. Its role is firmly established. The challenge is how to ensure vessels can continue to operate safely and confidently when satellite signals are disrupted or their integrity is uncertain. Addressing this requires a shift from reliance on a single source of positioning to a more resilient navigation approach.

APNT reflects a long-standing maritime principle: reliable navigation depends on comparing information from multiple sources rather than relying on a single instrument. In today’s digital context, this means combining GNSS with complementary systems that can support or validate positioning and timing data.

Building a layered navigation architecture

An APNT framework typically integrates multiple independent positioning sources. These can include additional satellite constellations, inertial navigation systems, terrestrial signals, and alternative timing references. Together, they form a layered architecture in which each component strengthens the resilience of the whole. When properly integrated, onboard systems can identify anomalies in satellite signals and maintain situational awareness even if one source becomes unreliable.

Defense organizations have long recognized the importance of this approach, reflecting the reality that operating conditions cannot always guarantee uninterrupted access to satellite navigation. In contested environments, degraded or denied GNSS is treated as a realistic operational scenario rather than a rare technical failure. This has driven sustained investment in resilient navigation systems capable of preserving operational capability when primary signals are disrupted.

A shared challenge across commercial and defense sectors

Commercial shipping is increasingly encountering similar conditions. Interference near major ports, congested spectrum environments, and disruption linked to geopolitical tensions all demonstrate that satellite signals can be affected by factors beyond the control of ship operators. Recent threats to vessels in key waterways highlight how quickly navigation risks can become tied to broader security and energy supply concerns.

For vessels transiting busy trade routes or approaching complex port infrastructure, the ability to validate positional data has therefore become an important part of operational risk management. Greater confidence in that data not only supports safer navigation, but also underpins more informed decision-making in environments where uncertainty is becoming a defining factor.

The maritime sector has repeatedly adapted its navigation practices in response to changing conditions. Celestial navigation gave way to terrestrial radio aids, which were later complemented and largely replaced by satellite systems. The growing emphasis on APNT reflects the next stage in that evolution. The focus shifts from simply obtaining a position to ensuring that the position being used can be trusted.

Satellite navigation will remain fundamental to maritime operations. However, resilience must increasingly be built around those systems rather than assumed. By integrating satellite positioning with complementary navigation and timing sources, the industry can maintain confidence in the data guiding vessels, even when signal conditions are less predictable.

As shipping becomes more connected, more automated, and in some regions more strategically contested, the ability to confirm the integrity of positioning data will become just as important as determining position itself.

Author Bio

Alastair MacLeod is Chief Executive Officer of Ground Control, a UK and US-based technology company specialising in satellite and hybrid IoT communications for remote and mission-critical operations. With more than 25 years’ experience in global connectivity and M2M solutions, he has led multiple innovations in low-power asset tracking and data efficiency across logistics, utilities, and environmental monitoring sectors.

About Ground Control

Ground Control is a UK- and US-based company specialising in reliable, rugged satellite and hybrid IoT communications solutions for remote and mission-critical operations. Founded nearly 30 years ago, the company has built a strong reputation for designing and manufacturing compact, low-power satellite IoT devices and two-way messaging trackers, used across industries where connectivity is essential, no matter how remote the location.

At the heart of Ground Control’s offering is Cloudloop, a flexible and secure device and subscription management platform that enables seamless provisioning, data routing, and operational visibility across diverse global asset fleets.

With teams based in the UK and California, Ground Control serves a broad range of sectors, including:

• Environmental science and monitoring
• Fisheries and marine operations
• Utilities and smart grid
• Renewable energy infrastructure
• Disaster response and early warning systems
• Agriculture and precision farming
• Defence and humanitarian logistics

Ground Control’s devices and platforms are used by governments, NGOs, research institutes, and industrial operators worldwide to enable data-driven decision-making, monitor assets in real time, and ensure business continuity in challenging environments.

Now part of the CLS Group, Ground Control continues to develop robust, field-proven technology while benefiting from the global reach, environmental mission, and scientific legacy of its new parent company.