Em-Trak B921 - User Manual

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B900 Series

Class B I AIS Transceiver User manual

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Questions and Answers

A
Adam GarrisonSep 1, 2025
What to do if the red error indicator is flashing on my Em-Trak B921 Transceiver?
- V
  Valerie WashingtonSep 2, 2025
  If the red error indicator is flashing on your Em-Trak Transceiver, it may indicate a problem with the VHF antenna system. You can confirm this using proAIS2. If the 'High VSWR' alarm is active, check for a faulty VHF antenna, cable, or connectors, a poor connection at the VHF antenna/cable/connectors, the suitability of the VHF antenna (antennas tuned to 162MHz are recommended for AIS only, while antennas tuned to 159MHz are recommended for splitter variants), and the VHF antenna location (ensure it isn't mounted near other transmitting antennas, sources of interference, metal structures, or other obstructions).
S
Stacy Marquez DDSAug 31, 2025
Why is the red 'error' indicator illuminated on my Em-Trak B921?
- R
  Robert RiggsAug 31, 2025
  If the red 'error' indicator is illuminated on your Em-Trak Transceiver, first check that the unit is programmed with a valid MMSI number using the Configuration tab in proAIS2. Next, ensure that the GNSS antenna has a stable position fix, which can be confirmed in the GNSS Status tab of proAIS2. Finally, verify that the power supply is within 12 - 24V using the Diagnostics tab of proAIS2.
E
ericrodriguezAug 29, 2025
What to do if I can't establish a connection using WiFi or Bluetooth on my Em-Trak B921 Transceiver?
- K
  Kelly ParkerAug 29, 2025
  If you can't establish a connection using WiFi or Bluetooth, verify that the transceiver is powered by 12 - 24V. Check the configuration parameters using proAIS2. Ensure that there are no obstructions between the transceiver and mobile device and that there are no sources of interference nearby.
A
Andrew GloverAug 27, 2025
How to troubleshoot no LED indicators illuminated on Em-Trak B921 Transceiver?
- B
  Brandon HernandezAug 28, 2025
  If no LED indicators are illuminated, check that the power supply is connected correctly and that the power supply is a 12V or 24V supply.
M
Matthew EwingAug 26, 2025
How to fix amber LED indicator flashing continuously on Em-Trak Transceiver?
- J
  Jeffrey FrankAug 26, 2025
  The amber LED indicator flashes while the transceiver searches for a position fix. If it takes longer than a minute, check the performance of the GPS antenna by using the GPS Status tab of proAIS2.
J
jessica84Aug 25, 2025
What to do if no data is being received by the chart plotter from my Em-Trak Transceiver?
- E
  Erin VasquezAug 25, 2025
  If no data is being received by the chart plotter, check that the signal wires are connected correctly and that the baud rate matches on both the transceiver and the chart plotter. Also, confirm that other vessels are within radio range and that they are displayed on the Other Vessels tab of proAIS2.
S
Samantha WashingtonAug 22, 2025
Why is the red 'error' LED indicator illuminated on my Em-Trak B921?
- A
  Andrew GarciaAug 22, 2025
  If the red 'error' LED is illuminated, ensure that the unit is configured with a valid MMSI number, which can be checked in the Configuration tab of proAIS2. Also, verify that the GPS antenna has a stable position fix using the GPS Status tab in proAIS2 and confirm that the power supply is within 12 - 24V using the Diagnostics tab of proAIS2.

Summary

1 Regulatory notices

1.1 Safety warnings

Important safety information for installation and usage of the AIS transceiver.

1.2.3 RF emissions notice

Cautionary information regarding radio frequency emissions and safe operating practices.

1.2.7 FCC notice

Compliance information and operating conditions related to FCC regulations.

1.2.8 Important information for US customers

Specific regulations and requirements for US customers regarding data configuration.

1.2.9 Industry Canada notice

Compliance information and operating conditions related to Industry Canada regulations.

2 About your AIS transceiver

2.5 Configuration tools

Describes the software and methods for configuring the AIS transceiver.

3 Installation

3.2 Antennas

Guidance on installing and connecting VHF and GPS antennas.

3.2.1 VHF antenna:

Specifics on VHF antenna connection and requirements for different transceiver variants.

3.2.2 GPS Antenna:

3.3 Power

Instructions for connecting the power supply to the AIS transceiver.

3.3.1 Connecting the power and data cable:

Step-by-step guide for wiring the power and data cable.

3.4 Location and fixing of the transceiver

Guidelines for selecting an optimal mounting location and securely fixing the transceiver.

3.5 Configuration

Procedures for configuring the AIS transceiver with vessel data.

3.5.1 Switching on your AIS transceiver for the first time

3.5.2 Configuring your AIS transceiver

Introduction to proAIS2

WiFi configuration using ProAIS2

3.6 Connectivity

3.6.1 Connecting to an NMEA 2000 network

3.6.2 Connecting to your chartplotter

3.6.3 Connecting to your NMEA 0183 sensor

3.6.4 Connecting to your PC

3.6.5 WiFi & Bluetooth connectivity

4 Operation

4.1 LED indicators

4.2 Silent mode

Em-Trak B921 Specifications

General

AIS Class	Class B
Frequency Range	156.025 MHz - 162.025 MHz
Output Power	2W
Waterproof	IPx7
Modulation	GMSK
Type	AIS Transceiver
Frequency	161.975 MHz, 162.025 MHz
Voltage	9 - 32 V DC
Interfaces	NMEA 0183, USB
Power Supply	9 - 32 V DC
Interface	NMEA 0183
Operating Temperature	-15°C to +55°C
Certifications	CE, FCC
GPS Receiver	Built-in

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