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Water Linked Modem M64

Acoustic modem with record breaking performance

The Modem M64 is a two-way half-duplex 64bps acoustic modem with a robust and user-configurable data link.

The M64 sets a new market standard with its record-breaking physical size, low power requirement and cost. All this combined with a very useful technical specification, the M64 opens new possibilities for underwater communication in both existing and new areas.

  • Water Linked Modem M64
Water Linked
Stiklestadveien 1
7041 Trondheim


Key Specifications:

  • Two-way communication
  • 64 bit per second net data link, both ways
  • Typical latency ~500ms
  • 200 meter range


Key Features:

  • Omnidirectional operation which will keep the data link stable even when the modem is in motion and/or being rotated around its axes.
  • Fully self-contained with no requirements for external computers, top-side controllers or other devices.
  • Packet based protocol with extensive use of error detection to enable a highly robust transmission.
  • Auto sync feature will automatically setup the communication channel with another M64.
  • The integrated status LED makes it easy to confirm that the communication link is established and when data is transferred.
  • Serial 9600 baud UART 3,3V interface makes the M64 easy to integrate with other subsea equipment like sensors, ROVs and AUVs.
  • Easy to use API to transmit/receive packages etc.
  • Can operate simultaneous with Underwater GPS.
  • Extremely small size enabling easy integration in other equipment.
  • Very low power consumption.
  • Highly robust operation, also in areas with acoustic reflections (shallow water, around installations etc.)
  • Standard depth rated to 300 meters. Other depth ratings available on request.


  • Year of latest version
  • Area of Application
    AUV telemetry, ROV wireless control, Wireless subsea sensors, Research projects and basically any scenario where you need to wirelessly control and monitor subsea equipment
  • Power Supply [V]
  • Operating current
    216 mAh at 12V
  • Output interface
    Serial UART 3,3V
  • Width [m]
  • Length [m]
  • Operating temperature: min. [°C]
  • Operating temperature: max. [°C]
  • Weight in air [kg]
  • Transducer beam shape
    360 deg
  • Acoustics date rate
    64 bit per second, both ways
  • Beam width
    360 deg
  • Maximum range (sea/fresh water)
    200 meter
  • Depth rating {m}
  • Data storage
    1 MB
  • Cables
    3 meter

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