GPS: Safe navigation with the help of technology

When a GPS is operational, it automatically starts the detection of satellites. Once you identify and "lock" the signal from at least three satellites is the minimum information needed to calculate the position. Once you come into contact with a fourth satellite is able to calculate the altitude from the sea. From this time onwards the information provided is accurate, which is growing with the corresponding number of additional satellites continues to receive, and the signal strength of each satellite.To a GPS system to determine the global positioning points throughout the day and down in all weather conditions.The accuracy provided by GPS is better than that of nautical charts. Is therefore understandable that is more useful and more accurate to introduce an electronic map navigation by combining the naval hydrographic information for display on a digital map.