(0) Item Hello, Guest
em-trak B350 Class B SOTDMA AIS Transponder
em-trak B350

em-trak B350 Class B SOTDMA AIS Transponder

On sale$499.00
Retail Price:$699.00
Your Savings:$200.00(29%)
Part Number:ET-413-0086

Choose Options

Optional em-trak AIS/VHF Antenna Splitter help
S300 AIS/VHF Antenna Splitter [+$195.00]

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.


The em-trak B350 is a certified high powered AIS Class B transceiver that is ideal for those requiring enhanced AIS transmit capabilities with guaranteed seamless connectivity to their MFD’s, displays and APP’s.

As a high powered AIS Class B the B350 transmits at over twice the power of standard AIS giving you increased range, as well as transmitting up to 5 times more frequently using the priority SOTDMA transmit method; useful for mariners operating in busy areas or times of low visibility; this capability is further enhanced by HF-AIS technology which enables you to see more AIS targets. All this is achieved whilst maintaining ultra-low power consumption.

The B350 is small and entirely water and weather proof and comes with an integrated high-performance GPS antenna making an external antenna optional in most installations and providing complete installation flexibility and convenience.

The B350 is the perfect choice for the serious mariner looking for uncompromised quality and performance within a small package and competitive price.

  • Processes all AIS transmission and message types. 
  • Globally certified High Powered AIS Class B (5W SOTDMA) – FCC, EU-MED, USCG, Industry Canada and more. 
  • HF-AIS core technology for enhanced performance and better AIS data. 
  • Market leading ultra-low power consumption. 
  • Ruggedized – water (IP66 & 67), weather, vibration, shock proof with enhanced radio interference protection. 
  • Integrated high performance GPS receiver and antenna – external antenna is optional. 
  • Dual NMEA0183 & NMEA2000 intelligent MFD / display system / APP connectivity. 
  • Silent mode – transmit function disabled but unit continues to receive.
  • 5 Stars
    Purchased this AIS after traveling in fog near commercial traffic. I could see them with my AIS enabled VHF and Chartplotter, but they could not see me visually or on RADAR. I feel safer with this capability added to my vessel. I've been told that law enforcement likes AIS as well as it tells them that you are providing consistent information. I boat near a Navy station that frequently has range boats in the area, AIS allows us to know who is who and where we are. I chose to install a separate antenna for the AIS as it will provide some redundant capability for my VHF. I checked with Marine Traffic online and I showed up on their system within 15 minutes of all green on the AIS. I am happy with my purchase and it's performance to date.
    Did you find this helpful?  7 of 8 Found Helpful
    Reviewed by: (Verified Buyer)  from Colonial Beach. on 5/29/2018
    5 Stars
    Great little unit
    I connected this to a dedicated antenna on top of our mizzen mast and to the nema 2000 network. Powered on and was working immediately! We're transmitting our position and more receiving far more targets than with the receive only unit. As a bonus I was pleasantly surprised to find that the USB connection, when connected to openCPN on my laptop was not only supplying AIS information, but position as well!! BONUS!
    Did you find this helpful?  2 of 3 Found Helpful
    Reviewed by: (Verified Buyer)  from Houston. on 4/4/2019
    5 Stars
    Great unit, easy installation, works well with my Raymarine equipment. Really wanted SOTDMA as this is a high commercial traffic area and I want to be very visible. Unit has been in place for 6+ months and working great!
    Did you find this helpful?  0 of 1 Found Helpful
    Reviewed by: (Verified Buyer)  from Houston, TX. on 10/14/2019

    Related Items


    Portable GPS Antenna with TNC Connector
    Average Rating(0)
    MA-700 GPS Antenna with TNC Connector
    Average Rating(0)
    $69.00  $59.00

    Recently Viewed Items