Simrad MX521B D/GNSS Smart Antenna

The MX521B is a precision D/GNSS (Global Navigation Satellite System) D/GPS positioning solution in a smart antenna.

  • IMO Compliant GPS/DGPS sensor with GLONASS^^
  • Enhanced position performance with GLONASS
  • Flexibility for easy integration into NMEA 0183 interface
  • RAIM (Receiver Autonomous Integrity Monitoring) enabled
  • Meets Smart Beacon specifications for DGPS Smart Antenna
  • Connects directly to MX Control and Display Unit
  • Better than 1 meter DGPS Position accuracy
  • Better than 3 meter GPS position accuracy
  • Built-in DGPS source include SBAS (WAAS, EGNOS, MTSAT)
  • D/GPS mode compatibility with MX420/MX510 and MX512 CDU

^^ SIMRAD CDU is required to comply as an IMO approved system

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    DGPS Smart Antenna

    The MX521B delivers position accuracy better than 1 meter in DGPS/DGNSS mode when using RTCM corrections.


    Navigation authorities around the world have installed DGPS radio beacon networks that broadcast RTCM corrections. With the use of its built-in beacon demodulator, the MX521B uses these real-time corrections to deliver accurate, reliable positioning when antenna is within range of Beacon station.


    Receiver Autonomous Integrity Monitoring (RAIM) is a safety feature in the MX521B which continuously verifies the integrity of the GPS system to ascertain its accuracy and reliability. When satellite range error exceeds a pre-set limit, the CDU alerts the operator to take precautionary measures.


    The MX521B features two independent NMEA compliant serial ports which are identical to MX421B-10 and MX521A DGPS smart antenna.


    Operating Temperature -30°C to + 70°C (-22°F to + 158°F)
    Operating Temperature Stored -40°C to + 85°C (-40°F to + 185°F)


    Humidity Range [rh] 95% non-condensing


    Power Consumption 4.3 W nominal (GPS L1 + GLONASS L1)
    4.6 W nominal (GPS L1 + GLONASS L1 + Beacon)
    Power Data Connector 10-pin, environmentally sealed
    Reverse Polarity Protection Yes


    Baud Rates 4800 - 38400
    Correction I/O Protocol RTCM v2.3 (DGPS)
    Data I/O Protocol NMEA 0183

    GPS Navigation

    GPS Receiver Channels 12


    When you choose a product from Navico Commercial, you are automatically protected by our service and support program.

    Our Service & Support program aims to provide the best possible experience, even on occasions when support or replacement is required.

    Choosing to have your system installed by a Certified Dealer adds 2 Year Onboard Support and 24 Hour Replacement to your support package. This is available only on systems installed by a Certified Dealer and valued at over US$2500.

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    Navico guarantees its products against defects in materials or workmanship according to the terms and conditions detailed within the Navico Warranty Policy. Customers can obtain warranty support by contacting: