What is the primary purpose of using a GPS in navigation?

The primary purpose of using a GPS in navigation is to establish position and course. GPS, or Global Positioning System, provides highly accurate location data by utilizing a network of satellites that transmit signals to receivers on the Earth's surface. This allows mariners to ascertain their exact geographic position in real time.

By pinpointing their position, navigators can chart a course to their destination and make informed decisions about their navigation, such as avoiding hazards or adjusting their route based on current conditions. The accuracy of GPS enables vessels to navigate efficiently, enhancing safety and improving overall navigation effectiveness.

While factors like reducing fuel consumption, determining time of arrival, and communicating with other vessels are important aspects of navigation, they are secondary to the fundamental capability of GPS to provide precise location information, which is crucial for effective navigation.