High Frequency (HF) radios are essential for long-range communication in maritime environments. Service and calibration ensure these radios provide clear, reliable communication over vast distances, especially in remote areas. Maintenance includes testing signal strength, adjusting frequencies, and ensuring the radio is correctly tuned. Calibration ensures the system meets operational requirements and complies with international communication standards. A properly serviced HF radio ensures that the vessel can maintain communication with shore stations and other vessels, providing safety and operational efficiency for the crew.