What is a common tool used to determine a vessel's position?

A common tool used to determine a vessel's position is GPS, or Global Positioning System. GPS works by utilizing a network of satellites that send signals to a receiver on the vessel. This receiver calculates the vessel's precise location by triangulating the signals received from multiple satellites. The technology is highly accurate and has become a standard method for navigation in marine environments, greatly enhancing the safety and efficiency of maritime operations.

When comparing GPS to other tools, while radar can help in detecting other vessels and land obstacles, it does not provide precise positional information. Sonar is primarily used for underwater navigation and object detection beneath the water surface, rather than surface positioning. A compass, although essential for navigation by indicating direction relative to magnetic north, does not give specific location coordinates. Thus, GPS stands out as the most effective and commonly used tool for determining a vessel's position.