What’s the difference between a chartplotter and a fishfinder?

A chartplotter shows your GPS position on electronic charts for navigation. A fishfinder uses sonar to show what’s below the boat — depth, bottom structure, and fish. Many modern units combine both, and networked systems can share data across displays.

Do I really need a VHF radio?

For safety, yes. A VHF radio is the primary way to reach other vessels and the Coast Guard, and a DSC-equipped VHF connected to GPS can transmit your position in an emergency. It’s more reliable than a cell phone offshore and is the recognized standard for marine distress calls.

What is NMEA 2000 and do I need it?

NMEA 2000 is a standard network that lets marine electronics — chartplotter, sonar, autopilot, sensors, engine data — share information over a single backbone. It’s not required for a simple setup, but it makes multi-device systems far easier to expand and integrate.

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em-trak

em-trak B921 Class B AIS Transceiver - 2W CSTDMA

Manufacturer: em-trakPart #: 430-0001SKU: 98701

12V
25°

$700.70● In stock

Item #: 98701

Category: AIS Systems

● In stock — ships fast from US warehouses

Ships from US warehouses
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Description

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.

Specifications

Brand	em-trak
Part Number	430-0001
EverTide SKU	98701
UPC	672975210502
Voltage	12 V
Beam Angle	25°

Specifications are provided by the manufacturer. Confirm fitment for your application before ordering, or contact us and we'll help.

Compare similar products

	em-trak B921 Class B AIS Transceiver - 2W CSTDMA$700.70You're viewing	em-trak A200 Class A AIS Transceiver$2744.50	em-trak B922 Class B AIS Transceiver w/WiFi & Bluetooth Wireless Connectivity - 2W CSTDMA$1027.40	em-trak B923 Class B AIS Transceiver w/VHF Splitter - 2W CSTDMA$911.90
Voltage	12 V	12 V	—	—

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Returns & warranty

Returns are accepted within 30 dayson items that are unused and in their original packaging. Some items may be subject to a manufacturer restocking fee. Special-order items may not be eligible — if you're unsure, ask us before ordering.

em-trak productscarry the manufacturer's standard warranty. For a warranty claim or a return authorization, see our full returns policy or contact us.

Marine Navigation & Instruments — frequently asked

What’s the difference between a chartplotter and a fishfinder?: A chartplotter shows your GPS position on electronic charts for navigation. A fishfinder uses sonar to show what’s below the boat — depth, bottom structure, and fish. Many modern units combine both, and networked systems can share data across displays.
Do I really need a VHF radio?: For safety, yes. A VHF radio is the primary way to reach other vessels and the Coast Guard, and a DSC-equipped VHF connected to GPS can transmit your position in an emergency. It’s more reliable than a cell phone offshore and is the recognized standard for marine distress calls.
What is NMEA 2000 and do I need it?: NMEA 2000 is a standard network that lets marine electronics — chartplotter, sonar, autopilot, sensors, engine data — share information over a single backbone. It’s not required for a simple setup, but it makes multi-device systems far easier to expand and integrate.

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