GPS systems are crucial for navigation, providing precise positioning to ensure vessels follow their intended routes. Calibration and service of marine GPS systems involve checking signal accuracy, updating software, and ensuring compatibility with other navigation systems. Routine servicing ensures that the GPS system operates at its optimal level, preventing issues such as signal loss or incorrect positioning data. Properly calibrated GPS systems minimize the risk of navigation errors, improve operational efficiency, and ensure the vessel complies with SOLAS and other safety standards for accurate positioning.