Marine GPS systems are crucial for determining accurate positions at sea, which is vital for safe navigation. Regular calibration of GPS systems ensures the equipment remains accurate and reliable, preventing navigational errors. Calibration involves testing satellite signals, verifying accuracy against known coordinates, and updating software. Proper maintenance and calibration of the GPS system help ensure that the vessel stays on course, avoids hazards, and complies with international maritime safety standards. Accurate positioning is essential for both day-to-day operations and during critical situations.