em-trak B951 Class B AIS Transceiver - 5W SOTDMA

The B951 Class B AIS Transceiver by em-trak is a top-of-the-line solution for marine communication, offering high power and superior reliability. Designed for boating enthusiasts and professionals, this transceiver ensures you stay connected and informed on the water.

Important Notice: The FCC mandates that all units sold in the US must be programmed by a qualified technician. Please submit the form below for programming at the time of purchase. A copy of the MMSI registration or FCC Ship Station License is required, along with the vessel master or owner's signature on the completed programming form.

Download Programming Form

Advanced Performance and Reliability

The B951 is a high-power (5W SOTDMA) Class B transceiver that delivers exceptional performance through em-trak's next-generation technology. Compact and robust, this transceiver processes all AIS transmissions in real-time, offering increased range and transmission priority. This ensures you have a complete situational awareness and ample time to respond, even in the busiest maritime environments.

Seamless Integration and Installation

With em-trak's flexible and intelligent connectivity, the B951 pairs effortlessly with any chart plotter. Its built-in GPS receiver and antenna are integrated for optimal performance and ultra-low power consumption. The innovative FLEXI-FIT® bracket system guarantees easy and secure installation, making setup straightforward for any vessel.

Key Features

• Certified AIS Class B – 5W SOTDMA
• Global certification: USCG, FCC, Canada, Europe
• SRT-AIS™ Transceiver Engine for proven top performance
• FLEXI-FIT™ bracket system for easy and secure installation
• Internal high-performance GPS receiver and antenna (external antenna optional)
• IPx6 and IPx7 certified for water, pressure spray, and damp proofing
• Resistant to vibration, shock, and extreme temperatures
• Compact and lightweight design
• Ultra-low power consumption – best in class
• Supports NMEA 0183 & NMEA 2000 interfaces
• Automated health and performance monitoring
• Silent mode (transmit-off) function
• Enhanced RF screening to protect against electromagnetic interference
• Built-in power surge protection

Specifications

Physical & Environmental

Specification	Details
Size (H x W x D)	150 x 115 x 45 mm
Weight	375 kg
Operating Temperature	-25°C to +55°C
Storage Temperature	-25°C to +70°C
Ingress Protection	IPx6 and IPx7

Electrical

Specification	Details
Supply Voltage	12V or 24V DC
Supply Voltage Range	9.6V - 31.2V DC
Average Current (at 12V)	135 mA
Peak Current	2.5 A
Average Power Consumption (at 12V)	1.6 W
Galvanic Isolation	NMEA 0183 inputs only, NMEA 2000, VHF antenna port

Connectors

• VHF antenna: SO-239
• GNSS: TNC
• Power: 12-way circular multipole
• NMEA 2000: 5-way Micro-C connector
• USB: USB Micro-B

Data Interfaces

• NMEA 0183: 2 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 62287-1 Ed. 3, 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 (Global Navigation Satellite System)

• Supported Systems: 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: 26 seconds

VHF Transceiver

• VDL Access Scheme: SOTDMA
• Operating Frequency: 156.025 MHz - 162.025 MHz
• Channel Bandwidth: 25 kHz
• Receivers/Transmitters: 2 receivers, 1 transmitter
• AIS Receiver Sensitivity (20% PER): -111 dBm
• AIS Transmitter Power: 5 W (+37 dBm)

User Interface

• Indicators: Power, transmit timeout, error, silent mode

What's in the Box

• 1 x AIS Transceiver
• 1 x Power and Data Cable (2M)
• 1 x FLEXI-FIT™ Mounting Bracket
• Screws & Optional Fixing Tape

Additional Specifications

Specification	Details
AIS Class	B
Antenna Included	Yes
Display Included	No
Function	Receive/Transmit
GPS Included	Yes
Box Dimensions	6"H x 7"W x 7"L
Weight	2 lbs
UPC	672975210540

Quick Resources

Quick Guide (PDF)

Brochure (PDF)

Orders of physical products placed by 3 PM EST M-F typically ships the same day, if all requested items are in stock. Weekend orders will typically ship on Monday.

Shipping takes 2-7 days.

We currently ship to the Contiguous 48 States.

Life of Sailing merch is custom made for the customer after an order is placed. Total turnaround is typically 7-14 days from order to doorstep.