em-trak B921 Class B AIS Transceiver – 2W CSTDMA
The 2-watt CSTDMA em-trak B921 Class B AIS Transceiver transmits vessel information and receives nearby AIS targets. Its Class B operation helps recreational and smaller commercial vessels share position data, improving traffic visibility and supporting safer decision-making in busy waterways.
EM-TRAK B921 Class B AIS Transceiver - 2W CSTDMA Specifications
| Communication Type | Class B AIS Transceiver (Standard) |
| AIS Class/Protocol | CSTDMA (Carrier Sense) |
| Output Power | 2W Output Capacity |
| Frequency Range | 156.025 – 162.025 MHz |
| Reporting Rate | 30 Sec to 3 Min (Speed Dependent) |
| Operating Voltage | 12V / 24V DC Support |
| Current Draw | < 170mA @ 12V Average |
| Interface/Networking | NMEA 2000, NMEA 0183, USB Interface |
| Internal GPS | 72-Channel High-Sensitivity Receiver |
| Display Type | Multi-Color LED Status System |
| Waterproof Rating | IP67 & IP66 Rated Protection |
| Operating Temperature | -25°C to +55°C Marine Grade |
| Length (Overall) | 150 mm (5.9") Compact Housing |
| Width/Diameter | 110 mm (4.3") Width |
| Weight | 0.35 kg (0.77 lbs) |
| Included Accessories | Power/Data Cable, Mounting Bracket |
| Key Mechanical Feature | Ultra-low power consumption for small vessels |
Common Question of em-trak B921
What is the B921 transceiver?
The em-trak B921 is a Class B AIS transceiver with 2W CSTDMA according to the listing. It transmits and receives compatible AIS data. Confirm antenna, GPS, display, power supply, cabling, network, and Class B AIS transceiver compatibility before installation.
What does 2W CSTDMA mean?
2W CSTDMA identifies the listed Class B AIS transmission power and access method. Confirm regional requirements, antenna installation, GPS source, display connection, power supply, and configuration before commissioning. Actual operating performance depends on antenna height and system setup.
Does it include GPS?
Confirm the exact package contents before purchase. The supplied title identifies a Class B AIS transceiver but does not state that a GPS antenna or display is included. Verify GPS source, antenna, cabling, software, and network components before installation.
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