Patented Electromagnetic Field Signalling

Providing the missing communication layer for real-world water intelligence

Our patented technology carries data through water, ice and ground — enabling continuous monitoring in environments where traditional wireless and cabled infrastructure simply can't operate.

  • Omni-directional antenna
  • Low-power listening mode
  • Networking capability
  • Extended range
Our Vision

Extending the reach of IoT and Physical AI beneath the surface

The world is increasingly driven by connected sensors, intelligent automation, and AI-powered decision-making, yet vast portions of the physical environment remain inaccessible to conventional wireless communications. Oceans, rivers, reservoirs, subsea infrastructure, under-ice environments, and buried assets represent some of the most critical and least connected regions on Earth.

CSignum's vision is to extend the reach of IoT and Physical AI beneath the surface — enabling continuous monitoring, real-time intelligence, and autonomous decision-making in environments where traditional radio-based networks cannot operate. By unlocking reliable wireless connectivity below water, ice, and other challenging physical barriers, CSignum empowers organisations to better manage water quality, protect critical infrastructure, improve environmental stewardship, enhance operational efficiency, and support the next generation of intelligent autonomous systems.

As the world becomes increasingly dependent on data-driven decisions, CSignum is connecting the last major frontier of the Internet of Things — the hidden environments beneath the surface.

The EM-2 Platform

Solutions-led water monitoring specialists

One patented core technology — Electromagnetic Field Signalling — packaged into three field-proven products for the world's harshest environments.

EM-2

Wireless Through Water, Ice & Ground

The platform that pioneered carrying data with low-frequency electromagnetic fields — naturally crossing boundaries that stop acoustic and RF systems.

  • Performance unaffected by biofouling, turbidity or environmental noise
  • Easily integrated with multiparameter sondes and ADCP sensor packs
  • No adverse effects on aquatic life
  • Bidirectional point-to-point comms today; multi-point on the roadmap
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CSignum EM-2 device
EM-2S

Wireless Ship Hull Monitoring

Purpose-designed to mount below the waterline, providing reliable two-way data from hull-mounted sensors to a topside unit — no cables through the hull.

  • Reliable transmission from hull sensors to topside, no penetrations
  • Integrates with a variety of sensors for a holistic hull view
  • Real-time data enables proactive, predictive maintenance
  • Non-intrusive design; can be welded by commercial divers
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CSignum EM-2S device
EM-2Q

Wireless Water Quality Monitoring

A transformative wireless solution for any industry tasked with water quality monitoring — from rivers and reservoirs to combined sewage overflows.

  • Reduced environmental impact
  • Seamless integration with industry-leading sondes
  • Reliable, real-time data
  • Reduced risk of vandalism and theft · consistent cost per site
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CSignum EM-2Q device
Compare the range

Find the right EM-2 for your environment

Primary use
Through water, ice & ground
Ship-hull monitoring
Water quality monitoring
Environment
Subsea · environmental
Marine vessels
Rivers · reservoirs · coastal
Range
Up to 170–230 m
Hull to topside
Up to 100 m to bankside
Carrier
EMFS
EMFS
EMFS
Sensor integration
Through-ice capable
Sonde integration
Airbag recovery
Retrofit / weldable
Resilient Wireless Communications

One technology that breaks through the barriers

Traditional wireless networks do not work underwater. CSignum's patented Electromagnetic Field Signalling (EMFS) carries data across the boundaries that stop everything else — water, ice and ground — with no cables, no surface buoys and no compromise.

See how it works

Through Water

Bidirectional sensor data at distances up to 200m — unaffected by turbidity, biofouling or acoustic noise.

Through Ice

Continuous under-ice monitoring where oxygen depletion and phosphorus release drive critical water-quality processes.

Through Ground

Signal crosses rock, soil and sand for subsea and underground infrastructure monitoring.

CSignum EM-2Q wireless water quality monitoring — data travelling through ice, water and ground to a topside EM-2 gateway and the CSignum Cloud, with drone and portable data recovery.
EM-2Q deployment — from seabed sensor through water, ice & ground to the CSignum Cloud.
Patented EMFS

The pioneers of wireless data through
low-frequency electromagnetic fields

We pioneered carrying data with electromagnetic field signalling — naturally crossing the boundaries that stop acoustic, optical and radio systems, so you can monitor where nothing else can reach.

See the technology
0 m
Bidirectional range through water
# 0
First & only EMFS data platform
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Cable-free topside deployment
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Continuous real-time monitoring
Industry Memberships

Collaborating to build resilient water networks

Proud to work alongside leading organisations advancing smart water technologies and the Internet of Underwater Things.