B400 SERIESClass B

The B400 is a fully integrated high-powered priority transmit AIS Class B transceiver that delivers enhanced range and performance in busy areas and open ocean.

A single integrated and small unit which is certified weather and water proof, with integrated colour display, the B400 is easy to install, use, and integrate with all bridge systems as well as offering a full range of sophisticated AIS functionality such as alerts, target filters, vessel information lists, real time weather and more.


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  • Features

    • Certified high powered AIS Class B (5W SOTDMA)
    • High Performance latest generation GPS
    • Ruggedized and impervious to extreme environments – water (IP67), damp, shock, vibration, temperatures.
    • Suitable internal or permeant external installation
    • Robust ergonomic button and rotary-knob user interfaces with configurable multi-lingual menu options
    • Integrated high definition colour display with night mode
    • ENC chart (C-MAP) with configurable AIS target overlay
    • Multiple Functionality – Collision, CPA, MOB, SAR, Vessel Lists, Text Messaging, Weather, Active Monitoring, Silent Mode, plus much more
    • Professional live AIS AtoN information display
    • Plug & Play Connectivity – Integrated WiFi, NMEA0183 & NMEA2000
    • Enhanced RF screening to protect against electromagnetic interference
    • Built-in power surge protection
  • Technical Specification

    Size (w x h x d) – 152 x 165 x 95mm
    Weight – 1.1kg
    Operating temperature – -25°C to +55°C
    Storage temperature – -25°C to +70°C
    Ingress protection – IPx6 and IPx7


    Supply voltage – 12V or 24V DC
    Supply voltage range – 9.6V – 31.2V DC
    Average current (at 12V) – 480mA
    Peak current – 4A
    Average power consumption (at 12V) – 5.8W
    Galvanic isolation – NMEA 0183, NMEA 2000, Power supply, VHF antenna port


    VHF antenna – SO-239
    GNSS – TNC
    Power – 2 way circular multipole
    NMEA 0183/silent mode – 14 way circular multipole
    NMEA 0183/alarm relay – 18 way circular multipole
    NMEA 2000 – 5 way Micro-C connector


    NMEA 0183 – 3 x input ports. 3 x bi-directional ports
    NMEA 2000 – NMEA 2000 Ed 3.101, LEN=1
    Wi-Fi – IEEE 802.11 (a/b/g), client and access point mode supported (5 connections in access point mode)

    AIS standards – IEC 62287-2 Ed. 2.  ITU-R M.1371.5
    Product safety standards – EN60950-1 2006 +A11:2009 +A1:2010 +A12:2011 +A2:2013
    Environmental standards – IEC 60945 Ed. 4
    Serial data interface standards – IEC 61162-1 Ed 5.0.  IEC 61162-2 Ed 1.0
    NMEA 2000 – NMEA 2000 Ed 3.101
    GNSS performance standards – IEC 61108-1 Ed 2.0.  IEC 61108-02 Ed 1.0


    Systems supported – GPS, GLONASS, BeiDou, Galileo
    (two of any combination, three including GPS, Galileo)
    Channels – 72
    Internal/external antenna – External only
    Time to first fix from cold start – 26s


    VDL access scheme – SOTDMA
    Operating frequency – 156.025MHz – 162.025MHz
    Channel bandwidth – 25kHz
    Receivers/transmitters – 3 x receivers, 1 x transmitter
    AIS receiver sensitivity (20% PER) – -111dBm
    AIS transmitter power – 5W (+37dBm)


    Screen – 5″ 800 x 480 full colour LCD
    Buttons – Rotary encoder for selection and entry, 4 menu keys and 4 direction keys
    SD card interface – Micro SD card interface for logging and chart cards (not available from em-trak)


    Size –  85 x 70mm
    Weight – 470g
    Ingress protection – IPx6 and IPx7
    Mounting – 1 inch 14 TPI pole mount required
    GNSS systems supported – GPS, GLONASS, Galileo, BeiDou


  • In The Box

    • 1 X AIS Transceiver
    • 1 X Mounting Bracket And Fixings Pack
    • I X Power Cable
    • 1 X Data Accessory Cable
    • 1 X GPS Antenna
  • Global Support & Warranty Service

    With em-trak you can buy with confidence. If you are unhappy with your new product for any reason, within two days of receipt and subject to the product and packaging being complete and undamaged, you may return it to us for a full refund.


    We are sorry, but we cannot accept the return of any product if you have not advised us in writing within 48 hours of receiving your em-trak product, or if it has been used and or damaged or if any of the package is incomplete. All em-trak products benefit from our three year global warranty.


    In the unlikely event of a problem, please contact our Customer Support department (24/7) at [email protected] and one of our experts will work with you to instantly resolve your issue or arrange the repair or replacement of your em-trak product. The warranty is invalidated if the product has been incorrectly used, damaged or tampered.

  • Manuals & Downloads



14 WAY DATA CABLE Accessory

14 way data cable suitable for use with A200 AIS Class A and B400 AIS Class B


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18 WAY DATA CABLE Accessory

18 way data cable suitable for use with A200 AIS Class A and B400 AIS Class B


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Core technology


Core technology continuously developed and proven over many years guarantees you the very best AIS receive and transmit and GPS performance, coupled with the lowest power consumption of any comparable AIS transceiver.



Quality engineered and manufactured with the best components to provide years of continuous, maintenance free operation in even the most extreme environments – impervious and protected against the long-term effects of water, damp, shock, vibration and extreme cold and heat.



Guaranteed connectivity to any chart-plotter and PC/Phone/Tablet/Watch and navigation app. This ensures you are not limited to any display device or navigation application now or in the future and can maximise AIS related functionality such as weather, MOB, anti-collision, anchor safety, vessel tracking and more.  



With features such as FLEXI-FIT bracket, integrated GPS antenna, VHF antenna splitter and unlimited connectivity options such as NMEA2000 & 0183, Bluetooth & Wifi. em-trak AIS transceivers are easy to configure and install on any boat.  



em-trak transceivers are rigorously tested and certified for global regulatory compliance. This includes FCC, USCG, Canada and EU test and certification.


Warranty & support

em-trak transceivers are designed and engineered for a life time of reliable operation in even the most extreme environments. This is supported by our best in class global warranty program with 24/7 customer support