Navigating Through Inmarsat C Link Test: A Comprehensive Guide

Conducting an Inmarsat C link test is an indispensable aspect of maritime communication management, ensuring the system’s readiness for critical situations. In the maritime industry, efficient communication is paramount for the safety and effectiveness of operations.

Inmarsat C (often abbreviated as InC or INC) has emerged as a crucial tool for maritime communication, providing reliable and global coverage for messaging, distress alerting, and telemetry data transfer. 

inmarsat c link test

Understanding the Significance

Inmarsat C is a vital component of the Global Maritime Distress and Safety System (GMDSS), mandated by the International Maritime Organization (IMO) for vessels over 300 gross tons engaged in international voyages. The system enables ships to exchange messages, including safety-related information, with shore-based facilities and other vessels. Ensuring the reliability of Inmarsat C through regular link tests is crucial for maritime safety and compliance.

Preparing for the Test

Conducting an Inmarsat C link test is an essential procedure to ensure the system’s functionality and readiness. Before initiating the link test, it’s essential to ensure that all equipment, including the Inmarsat C terminal, antenna, and associated software, are functioning correctly. Conduct a visual inspection of the equipment, checking for any signs of damage or wear. Verify the integrity of the antenna installation and the cable connections.

Initiating the Test

Access the Terminal's Menu

Enter the menu of the Inmarsat C terminal using the appropriate access code or password.

Select Test Mode

Navigate to the test mode option within the menu. This mode is specifically designed for conducting link tests and does not affect regular communication functions.

Initiate Test Transmission

Follow the prompts to initiate the test transmission. The terminal will send a predefined test message to the Inmarsat C network.

Monitor Transmission Status

Monitor the terminal’s display to ensure that the transmission is initiated successfully and that there are no error messages or abnormalities reported.

inmarsat c link test
Inmarsat C Link test being carries out by Team Vivo on board a FPSO vessel

Initiating the Test

Upon completion of the test transmission, the terminal will provide feedback regarding the status of the test. Common indicators include:

Successful Transmission

Indicates that the test message was transmitted successfully to the Inmarsat C network.

Failed Transmission

Indicates that the test message was transmitted successfully to the Inmarsat C network.


In the event of a failed transmission or any discrepancies in the test results, troubleshooting may be necessary. Some steps to consider include:

Inspecting Equipment

Verify the integrity of all equipment components, including cables, connectors, and power sources.

Antenna Alignment

Ensure that the satellite antenna is properly aligned and has an unobstructed view of the sky to establish a strong signal connection.

Network Coverage

Check for any known network issues or service disruptions that may affect transmission.

Get the Right Team

By following the outlined procedure, interpreting test results accurately, and adhering to best practices, maritime operators can uphold the reliability and effectiveness of their Inmarsat C communication infrastructure, thereby enhancing safety at sea.

Talk to the experts at Vivo Asia to get the right team on the job! We are well versed in industry regulations and product specifications. 

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