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Description
em-trak B921 Class B AIS Transceiver - 2W CSTDMAB921 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.**
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
Manufacturer : em-trak
Manufacturer Part No : 430-0001
UPC : 672975210502
Shipping Notes
- Free Standard Shipping on $100+ Orders to the USA.
- Except Preorder products are shipped in 48 hours.
- Delivery to the USA:
- 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
4.9 ★★★★★
Based on 1328 reviews
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Product Reviews
★★★★★ 5
The Best Cable Management Solution for IT Work — Reusable, Reliable, and Professional
Size: 150Pk - 8" x 1/2", Style: Cord Wrap Cable Ties, Color: Black and Gray
TL;DR: I’ve been using these VELCRO Brand cable ties for years as an IT field tech. They hold tight, are endlessly reusable, and keep cables tidy. Great for both home and professional setups.
Full Review:
As an IT field technician, I’ve tried countless ways to keep cables organized, and these VELCRO Brand cable ties are simply the best. They’re reusable, strong, and easy to reposition — ideal for network racks, AV installs, or just cleaning up cords around the house.
Functionality:
Top-notch. The hook-and-loop material is aggressive enough to hold firmly, but not so sticky that it clings to everything else in your tool bag. They wrap cleanly, stay put, and release easily when you need to re-route cables. They’re reliable enough for professional jobs and flexible enough for home use.
Storage Capacity:
Each strap holds more than you’d expect — I rarely need to link two together. They handle thick cable bundles or power cords just fine on their own. And when I do need more length, it’s easy to join a second strap for a larger wrap.
The two-color mix (black and gray) is great for keeping different cable types separated — for instance, network vs. power. The thin profile also helps keep bundles neat and professional-looking.
These have earned me plenty of compliments from higher-ups for clean cable runs and well-organized setups. Once you switch to these, you’ll never want to deal with cutting zip ties again.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on October 12, 2025
★★★★★ 5
VELCRO Ties Are the Standard to Rely On
Size: 150Pk - 8" x 1/2", Style: Cord Wrap Cable Ties, Color: Black and Gray
I am a big fan of VELCRO brand products because of their quality and utility. I have used their rolls of Velcro hook and loop tape as well as their little patches, and I became a brand loyalist. Yes, there are many other manufacturers, but these are certainly as good as it gets. This product is your very basic, very thin, and very copious supply (for my neighbors in Rio Linda - that means plenty of them). You get two big spools of these little eight (8) inch ties that are adhesive throughout their length - that means you can tie the smallest cables to anything almost up to their full length. If you need a longer wrap - use more than one and just extend the length by piggy backing them. The real advantage of this bulk package is that you are not tempted to save some for later - you have enough to use as many as you like and can happily go tie crazy on all your cords! It's VELCRO party time. We live in an electronic age, and I have a lot of more pricey hook-and-loop specialty ties, and I try to keep a few back as spares. Forget that - with these little ties, I can actually use them and do what I need to get those tangled cords in shape. O.K. maybe I am a geek, but I cook my chicken - dead already, and I believe in independent segregated wiring and not tripping over things or spending time untangling messes when I need to move gear. These big rolls will make your life easier - I use them to attach notes to little jars or vials - to tie two gloves together when I am not wearing them - and other uses even cutting them into smaller pieces. That's one of the advantages of these bulk spools - lots of supply. Yes, the individual ties are dinky thin little things, but they hold very well (why you buy genuine VELCRO) and you don't feel stupid using them up on anything you feel like. They are expendable, and that adds to their ultimate utility. Darned useful product. Buy it - use it; enjoy.
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Reviewed in the United States on February 17, 2024
★★★★★ 5
Computers, electronics cabling? You NEED these!
Size: 100Pk - 6” x ½”, Style: Cord Wrap Cable Ties, Color: Black
If you do any cabling, be it TV or computer or anything else, these ARE worth there weight in gold. Seriously! They'll keep your cable runs, extension cords, etc in a nice neat easy to work with bundle that you can have out of the way. Adhesion is very good also which is also important. Just the right size for most applications and if you need something large they make them to fit your needs. Cable management has always been a pet peeve of mine and makes a difference that not only shows but makes future work and maintenance much easier. Whenever I see a rat's nest cluster of wires I always know it means shoddy workmanship!
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on May 9, 2026
★★★★★ 4
Very Effective, but Not the Instructions
Size: 150Pk - 8" x 1/2", Style: Cord Wrap Cable Ties, Color: Black and Gray
These work very well, but when you remove them from the box, you see two donuts, one grey, one black, of 75 tightly wrapped cable ties each. So far, so good.
First deficiency: The "how to use" pictures---three of them---are tiny light line drawings in 7/16" x 7/16" boxes. If you don't have a 400-power microscope, maybe a magnifying glass will do. Maybe Velcro---a "name" brand that should know better---thinks that the use of these devices is obvious. Well, "obvious" is obvious only when it's obvious, and that can vary from person to person. They should assume nothing.
Second deficiency: Before trying (and, one hopes, succeeding) at using these ties, one must determine exactly now to remove the first tie from the outside of either donut. Obvious? No, not really, because, as it turned out, it requires some effort to remove the first one---the placement and circumstances of which do not at all (not on my set of these, anyway) suggest in any concrete way which one should be taken first. No one wants to tear up a couple of ties just to figure out how not to tear up ties by removing them incorrectly or out of order.
The punishment here is four stars that could have been five.
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Reviewed in the United States on May 13, 2026
★★★★★ 5
Must Have for Cable Management.
Size: 100Pk - 6” x ½”, Style: Cord Wrap Cable Ties, Color: Black
Best Velcro out the. Great for cable management. Super easy to use. Cannot be beat for the price. Incredibly useful.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on April 29, 2026
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