B921 Class B AIS Transceiver - 2W CSTDMA
**As the FCC requires all units sold in the US to 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.**
Click here to download form.
The B921 is a 2W CSTDMA Class B AIS transceiver, delivering em-trak's advanced performance and reliability through next-gen technology. Small and durable, this trusted transceiver processes all AIS transmissions in real-time, even at the range limit, so you always have the complete picture and the time to respond.
em-trak's intelligent connectivity means the B921 can be connected to any chart-plotter and comes equipped with integrated GPS technology and best-in-class, ultra-low power consumption. Installation is also simplified with our unique FLEXI-FIT bracket system to have you up and running in no time at all.
Features:
- Certified AIS Class B 2W CSTDMA
- Global certification - USCG / FCC / Canada / Europe
- SRT-AIS Transceiver Engine for superlative proven performance
- FLEXI-FIT bracket system for easy, convenient, and secure installation
- Internal high-performance GPS receiver and antenna (external antenna optional)
- Water, pressure spray, and damp proof (IPx6, IPx7 certified)
- Protected from vibration, shock, and extreme temperatures
- Small and lightweight
- Ultra-low power consumption best in class
- NMEA 0183 NMEA 2000
- Automated health and performance monitoring
- Silent mode (transmit-off) function
- Enhanced RF screening to protect against electromagnetic interference
- Built-in power surge protection
Physical Environmental Specifications:
- Size (H x W x D): 150 x 115 x 45mm
- Weight: 375kg
- Operating temperature: -25C to +55C
- Storage temperature: -25C to +70C
- Ingress protection: IPx6 and IPx7
Electrical Specifications:
- Supply voltage: 12V or 24V DC
- Supply voltage range: 9.6V - 31.2V DC
- Average current (at 12V): 135mA
- Peak current: 2A
- Average power consumption (at 12V): 1.6W
- Galvanic isolation: NMEA 0183, 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 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 62287-1 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:
- 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 the cold start: 26s
VHF Transceiver:
- VDL access scheme: CSTDMA
- 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: 2W (+33dBm)
User Interface:
- Indicators: Power, transmit timeout, error, silent mode
In the Box:
- 1 x AIS transceiver
- 1 x Power and data cable (2M)
- 1 x FLEXI-FIT mounting bracket
- Complete with screws optional fixing tape
This product may not be returned to the original point of purchase. Please contact the manufacturer directly with any issues or concerns.
The em-trak B921 is a compact, high-performance Class B AIS transceiver designed for reliable vessel tracking and safety communications. Featuring a 2W CSTDMA transmission power, this device ensures real-time AIS data processing at range limits, providing mariners with a comprehensive situational picture for enhanced navigation and collision avoidance. Its durable, weatherproof design (IPx6/IPx7 certified) makes it suitable for demanding maritime environments, including exposure to water, pressure spray, and extreme temperatures. The integrated high-performance GPS receiver offers accurate positioning, with support for multiple GNSS systems such as GPS, GLONASS, BeiDou, and Galileo, ensuring quick and precise location fixes even in challenging conditions. The B921 is engineered for easy installation with the FLEXI-FIT bracket system, allowing secure and straightforward mounting on various vessel types. Its ultra-low power consumption, combined with intelligent connectivity features like NMEA 0183 and NMEA 2000 interfaces, makes it compatible with most chart plotters and onboard systems. The transceiver also includes automated health monitoring, silent mode for transmit-off operation, electromagnetic interference shielding, and built-in surge protection to ensure consistent performance and safety. The device supports global certifications, including USCG, FCC, Europe, and Canada, meeting rigorous industry standards for safety and environmental impact. Whether utilized for recreational, commercial, or safety-critical vessels, the B921 provides a dependable AIS solution that enhances maritime navigation security. The package includes the transceiver, power and data cable, FLEXI-FIT mounting bracket, and optional fixing accessories, making installation quick and versatile. Designed to operate efficiently across a wide temperature range, the B921 combines advanced technology with user-friendly features, making it an essential tool for modern mariners seeking reliable vessel identification and collision avoidance capabilities.
Features:
- Certified AIS Class B 2W CSTDMA for reliable vessel identification
- Global certification including USCG, FCC, Europe, and Canada compliance
- SRT-AIS transceiver engine for superior performance and accuracy
- FLEXI-FIT mounting system for quick, secure installation
- Built-in high-performance GPS receiver supporting multiple GNSS constellations
- Water, pressure spray, and damp proof with IPx6/IPx7 certification
- Rugged construction protected from vibration, shock, and extreme temperatures
- Compact and lightweight design for versatile mounting options
- Ultra-low power consumption to optimize vessel power resources
- Supports NMEA 0183 and NMEA 2000 data interfaces for seamless connectivity
- Automated health and performance monitoring for maintenance ease
- Silent mode for transmit-off operation to reduce interference
- Enhanced RF screening to mitigate electromagnetic interference
- Built-in surge protection for electrical safety
