em-trak B921 Class B AIS Transceiver - 430-0001

em-trak B921 Class B AIS Transceiver - 430-0001

em-trak B921 Class B AIS Transceiver

The B921 is a standard power (2W CSTDMA) AIS Class B transceiver that is small, light-weight, yet delivers the very best AIS receive and transmit performance so you see more AIS information and targets at maximum range – all achieved with the least power consumption.

With built-in intelligent connectivity, integrated next-generation GPS and the unique FLEXI-FIT® bracket system, safe and secure installation could not be easier.

Not sure what the difference is between CSTDMA and SOTDMA? Read our Quick guide, Click Here

The B920 series AIS transceivers feature a built-in GPS antenna. In most cases this will work fine as long as the unit is mounted upright and not directly below metalwork or cables. If your installation is either compromised by metalwork or cables, or your hull is built from metal, then the GPS100 remote antenna is recommended. Please select this from the related products listed below.

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

Integrated high-performance GPS receiver & 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

1 x AIS Transceiver

1 x Power and Data Cable (2m)

1 x FLEXI-FIT Mounting Bracket – Complete with Screws & Optional Fixing Tape


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


Supply voltage – 12V or 24V DC

Supply voltage range – 9.6V – 31.2V DC

Average current (at 12V) – 135mA

Peak current – 2A

Galvanic isolation – NMEA 0183 inputs only, NMEA 2000, VHF antenna port


VHF antenna – SO-239


Power/NMEA 0183/silent mode – 12 way circular multipole

NMEA 2000 – 5 way Micro-C connector

USB – USB Micro-B


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


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


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


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)


Indicators – Power, transmit timeout, error, silent mode

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  • Brand: em-trak
  • Product Code: B921
  • Availability: In Stock
  • RRP Inc VAT: £468.00

  • Our Price: £389.00
  • Ex VAT: £324.17

Tags: class b, em-trak, b921