em-trak B400 Class B AIS Transponder

On sale $1,236.60
Retail Price:$1,374.00
Your Savings:$137.40(10%)
Part Number:ET-427-0003

Quick & Easy Online Form

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.
NOTE: This is a special order item with a 2 week lead time.

The B400 is a fully certified 5W SOTDMA AIS Class B transceiver

The em-trak B400 AIS Class B is a high powered ruggedized AIS transceiver ideally suited for offshore and professional mariners who demand superior performance, functionality and reliability.

The B400 transmits at a higher power (5W instead of 2W), significantly more frequently, and using the prioritized SOTDMA radio transmission protocol. This, combined with HF-AIS technology, translates into enhanced operational performance.

The B400 is certified IP67 water and weather proof and benefits from ruggedized construction that enables it to be installed and operate continuously and reliably outside in even the most hostile and extreme conditions. The integrated full colour hi-resolution display supports CMAP ENC (SD-CARD) charting with multiple display modes and an array of simple to use, but powerful functionality such as AIS target management, filters, proximity alerts, MOB/SART alert and tracking, race mode, real time weather display, and much more.

The B400 is exceptionally power efficient and easily installed and configured using the simple on screen menu. Connectivity includes dual NMEA0183 and NMEA2000 to enable connection to third party systems, and of course long range WiFi with no external antennas.



  • Certified 5W SOTDMA AIS Class B transceiver
  • Integrated color display and CMAP charting
  • Ruggedized, IP67 water and weather proof
  • MOB-SAR alert & track mode
  • Transmit off mode
  • Extensive AIS data and target functionality


em-trak B400/A200 USB Cable
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