SKU: 25446621508

em-trak B921 Class B AIS Transceiver - 2W CSTDMA [430-0001]

Sale price$283.78 Regular price$315.31
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Ships within 48 hours · Estimated delivery Jul 27 - Aug 1

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Description

em-trak B921 Class B AIS Transceiver - 2W CSTDMA [430-0001]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

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: -25°C to +55°C
  • Storage temperature: -25°C to +70°C
  • 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.

Specifications:

  • AIS Class: B
  • Antenna Included: Yes
  • Display Included: No
  • Function: Receive/Transmit
  • GPS Included: Yes
  • Box Dimensions: 6"H x 7"W x 8"L WT: 1.55 lbs
  • UPC: 672975210502

Quick Guide (pdf)
Brochure (pdf)
Shipping Notes
  • Free Standard Shipping on $100+ Orders to the USA.
  • Except Preorder products are shipped in 48 hours.
  • Delivery to the USA:
  1. Standard Shipping : 3-10 business days
  • If time is of the essence, please consider selecting expedited delivery for faster service.
Exchange/Return Notes
  • We offer a 30-day return/exchange service after receiving.
  • Final sale items are not eligible for returns or exchanges.
  • To process your return/exchange, please contact us at [email protected]
  • Please click here for more details>>> Return & Exchange Policy
SKU: 25446621508

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4.8 ★★★★★
Based on 18 reviews
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L
Verified Purchase
Lisa Brown
Pawtucket, US
★★★★★ 5
Nice product
Style: 2 Tier with Tower Bar
Great quality, great material. Easy to install. Looks great on the wall.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on May 10, 2026
H
Verified Purchase
HA
Lake Worth, US
★★★★★ 5
Great sturdy shelf, install can be a bit challenging
Style: 3 Tier with Tower Bar, Style: 3 Tier with Tower Bar
The shelf is great and does exactly what I wanted it to do. I will note that the instructions indicate you’re supposed to use a 6 mm drillbit to install the anchors which comes out to about a 15/64 size. I would recommend a quarter inch drillbit because I was really struggling to get those anchors in there. Several folks also said that it’s easiest to install with two people, but you don’t need two people if you have some way to prop the piece up while you’re marking the hole placements to drill (and I would definitely recommend having a level on it the entire time you’re working to make sure that it’s correct). Lastly, it is easiest to put it together first, and then mark the drill holes, put the piece aside and drill and install the anchors, and then screw it in. I will also caution folks to not overtighten the pipe connections, because the pipes will end up in a wonky direction in the end. Overall I am extremely happy with this piece and certainly for the price!!
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on February 2, 2026
A
Verified Purchase
Amazon Customer
San Leandro, US
★★★★★ 5
Easy to put together. Super cute in any room
Style: 3 Tier
I fell in love with these when we were at our kids home and we installed them for them. The way my daughter-in-law decorated them, I loved it. I ordered 3 of them. I ordered a two tier for my office, because the 3 tier was too big, and i have the 3 tier in my bathroom. They look so dang cute and finishes up the wall in those areas. They are sturdy and strong. Super easy to put together. No tools required, except when you need to hang them. It will require two people to hang them. You can put them together in less than 5 minutes. Not super heavy but strong. strong to hold several things on them. I had no parts missing. Everything came packaged very nicely. Very functional. I would definitely recommend.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on October 7, 2025
G
Verified Purchase
Ghall65
Phoenix, US
★★★★★ 4
Shelf
Style: 2-tier Vintage Industrial
I’m giving a 4 star due to installation. Screws were too small for the anchors. Shelf is very nice and looks great . Took little more time than what should have been an easy hang .
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on May 21, 2026
S
Verified Purchase
susanmacinmd
Lake Worth, US
★★★★★ 5
Great shelf
Style: Industrial / Rustic
I needed a shelf for my hallway. This was exactly what I was looking for. I have a farmhouse esthetic and it looks so good
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on May 22, 2026

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