Cables
Become snagged or fail under repeated stress from wave motion — expensive to install, maintain and replace.
EM-2
The wireless link that crosses the water–air barrier
EM-2™ supports environmental monitoring, marine data collection and subsea infrastructure monitoring — a wireless communication link that overcomes the limitations of acoustic, optical and cabled systems.
What does it do?
Transmission from sensor to shore
The splash zone and shallow-water environments are some of the most adverse conditions for subsea communication. EM-2 thrives exactly where acoustic and optical systems fail — moving sensor data reliably across the water surface to a topside gateway.
Why EM-2?
Every other method has a problem
Traditional methods of underwater-to-above-water transmission all carry limitations. EM-2 provides reliable wireless data transmission across the water–air barrier.
Acoustic
Cannot pass through the water–air barrier, and signals degrade badly in turbid, shallow and noisy water.
Optical
Affected by biofouling and degraded by ambient light and turbidity, limiting reliability over time.
Benefits
Reliable where it matters most
- Performance unaffected by biofouling, turbidity or environmental noise in the water column
- Easily installed and integrated with sensor packs such as multiparameter sondes and ADCP
- No adverse effects on aquatic life
- Bidirectional point-to-point communication today; multi-point connectivity on the roadmap
170 m Range 558 ft, extendable to 230 m / 755 ft
Bi-dir Link Bidirectional point-to-point
EMFS Carrier Electromagnetic Field Signalling
Water · Ice · Ground Barrier Crosses the water–air boundary
Applications
One platform, many environments
Internet of Underwater Things (IoUT)Ship under-hull & propulsion monitoringOffshore environmental & structural monitoringUnderground data monitoringAUV / ASV data harvestingInland & coastal environmental monitoringSecurity & defence
From splash zone to seabed
Reliable data where nothing else reaches
Across the air–water boundary, through turbid water, ice and ground — EM-2 keeps the signal moving.
View datasheets Future Plans
The EM-2 is only the beginning
CSignum continues to push the boundaries of underwater and underground data transmission — extending range, data rates and multi-point networking for the Internet of Underwater Things.
Talk to our team