em-trak B400 Class B AIS Transponder

Your Price: $1,688.00
Retail Price:$1,876.00
Your Savings:$188.00(10%)
In Stock
Part Number:ET-427-0003

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Free Class B AIS Programming

FCC regulations require Class B AIS units to be programmed with MMSI and vessel information before shipping to US addresses. Milltech Marine provides this service free of charge.

Common Questions About MMSI

To make it more convenient for you to provide vessel information, we have prepared this quick and easy online form. Please complete and submit at time of order.
We are required to have proof of valid MMSI, so please also send a copy of the issuing document.
If you do not have a copy of your MMSI assignment, contact the issuing authority or organization. To search the FCC licensing database, click here. For BoatUS information, click here.
Go here if you do not have an FCC Ships Station License and MMSI and wish to obtain one.
The B400 is a high-powered priority transmit AIS Class B transceiver that delivers ultimate reliability, enhanced range and advanced performance across the busiest waters and open ocean.

Designed for serious sailors and commercial applications, the B400 is a self-contained, fully integrated plug-and-play unit. 

Suitable for internal or external installation, it has been certified weather and waterproof, and offers a integrated color display to remove the need for additional screens. 

Easy to install and use, the B400 can be integrated with all common bridge systems, as well as offering a full range of advanced AIS functionality including alerts, target filters, vessel information lists, real time weather updates and more.


  • Certified high powered AIS Class B (5W SOTDMA)
  • High performance latest generation GPS
  • Ruggedized and impervious to extreme environments – water (IPx6, IPx7), damp, shock, vibration, temperatures
  • Suitable internal or permanent external installation
  • Robust ergonomic button and rotary-knob user interfaces with configurable multi-lingual menu options
  • Integrated high definition color 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, NMEA 0183 & NMEA 2000
  • Enhanced RF screening to protect against electromagnetic interference
  • Built-in power surge protection


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