Em-Trak B951 CLASS B AIS Transponder

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The B951 is a high-power (5W SOTDMA) Class B transceiver, delivering advanced performance and ultimate reliability through em-trak’s next-gen technology. Small and durable, this trusted transceiver processes all AIS transmissions in real-time, with increased range and transmission priority, ensuring you always have the complete picture and the time to respond, even in the busiest waters.

em-trak’s flexible, intelligent connectivity allows the B951 to be paired with any chart-plotter, and its next-gen GPS receiver and antenna are already integrated inside the device to provide best-in-class, ultra-low power consumption and performance. em-trak’s unique FLEXI-FIT® bracket system completes the package and ensures easy installation.

Certified AIS Class B – 5W SOTDMA
Global Certification – USCG / FCC / Canada / Europe
Plug & Play connectivity
FLEXI-FIT™ bracket system for easy, convenient, and secure installation
Integrated high-performance GPS receiver and antenna (external antenna optional)
Water, pressure spray, and damp proof (IPx6 & IPx7)
Ruggedized – Protected from vibration, shock, and extreme temperatures
Small and lightweight
Ultra-low power consumption – best in class
NMEA0183 & NMEA2000
Automated health and performance monitoring
Silent Mode (transmit-off) function
Enhanced RF screening to protect against electromagnetic interference
Built-in power surge protection

Physical and Environmental Specification
- Size (w x h x d): 150 x 115 x 45mm
- Weight: 375g
- Operating temperature: -25°C to +55°C
- Storage temperature: -25°C to +70°C
- Ingress protection: IPx6 and IPx7
Electrical Specification
- Supply voltage: 12V or 24V DC
- Supply voltage range: 9.6V – 31.2V DC
- Average current (at 12V): 135mA
- Peak current: 2.5A
- Average power consumption (at 12V): 1.6W
- Galvanic isolation: NMEA 0183 inputs only, NMEA 2000, VHF antenna port
Connectors
- VHF antenna: SO-239
- GNSS: TNC
- Power/NMEA 0183/silent mode: 12-way circular multipole
- NMEA 2000: 5-way Micro-C connector
- USB: USB Micro-B
Data Interfaces
- NMEA 0183: 2 x bi-directional ports
- NMEA 2000: NMEA 2000 Ed 3.101, LEN=1
- USB: PC virtual com port for NMEA 0183 data
Standards Compliance
- 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 EN62311:2008
- 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
GNSS
- Systems supported: GPS, GLONASS, BeiDou, Galileo
- (two of any combination, three including GPS, Galileo)
- Channels: 72
- Internal/external antenna: Internal or optional external antenna
- Time to first fix from cold start: 26s
VHF Transceiver
- VDL access scheme: SOTDMA
- Operating frequency: 156.025MHz – 162.025MHz
- Channel bandwidth: 25kHz
- Receivers/transmitters: 2 x receivers, 1 x transmitter
- AIS receiver sensitivity (20% PER): -111dBm
- AIS transmitter power: 5W (+37dBm)
User Interface
- Indicators: Power, transmit timeout, error, silent mode