GNSS systems, including GPS, GLONASS, and Galileo, offer precise navigation and positioning capabilities for vessels worldwide. Regular service and calibration of GNSS systems ensure accurate position data, crucial for route planning, chart plotting, and operational efficiency. Maintenance involves inspecting antenna connections, checking signal quality, and updating system software for optimal performance. Regular servicing of GNSS systems ensures that vessels maintain the correct course, avoid hazards, and comply with international maritime navigation regulations, reducing the risk of accidents and delays. Reliable GNSS systems are essential for modern vessel operations and safety.