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Engineering a Smarter Planet

Our Products and Technology 2022 Copy

CSignum HydroFi Modems overcome the limitations of acoustic, optical and cabled subsea communications with new wireless solutions that automate and reliably transmit dynamic data as needed subsea, and bi-directionally through the water-air boundary. As a result of innovative HydroFi technology, ocean industries can now optimize operations and connect “first mile” subsea data with last mile WiFi signals for an end-to-end digital infrastructure that enables them to respond quickly to change.

At a glance

  • HydroFi performance is unaffected by biofouling, turbidity or environmental noise in the water column
  • Ease of installation and integration with multiple sensor packs, such as multiparameter sonde and ADCP
  • Avoids adverse effects on aquatic life that can be caused by acoustic systems
  • Two-way communication available with first version with multi-point connectivity and relay networks planned in technology roadmap


Depth Rating Current Standard: 100m (328ft)
Future Development: up to 3,000m (9,842 ft)
Ambient Operating Temperature-20°C (-4°F) to +45°C (113°F)
DimensionsOD 110mm | Length 500mm (9 cell battery)
4.4kg (9.7lbs)
Housing Material
Housing: Acetal | Antenna ferrite
Data Interfaces:
Current Standard: RS-232, RS-485, SDI-12
Topside Base Station: CSignum custom configuration application
Topsides Base Station
CSignum Custom Configuration Application
Topsides Base Station Input Power
Supplied Battery or 9V to 28V DC external power
External Sensor Pack Interface
8-way Female Subconn
Antenna Options
External Ferrite, External Loop
Battery Capacity
9 cell battery pack—supplied with alkaline/lithium (Li/SOCl2) or
rechargeable NiMH


Benefits of HydroFi Wireless Technology