What is the function of the Global Positioning System (GPS)?

The Global Positioning System (GPS) functions by determining a user's location through the use of satellite signals. It operates by triangulating the position of a receiver based on signals sent from multiple satellites orbiting the Earth. This technology provides precise geographical coordinates, which are essential for a variety of applications, including navigation, mapping, and, in the context of mosquito control, effectively identifying locations for monitoring and treatment efforts.

The other options presented, while relevant to agricultural and environmental practices, do not accurately describe the primary function of GPS. Identifying pesticide mixing sites or surveying agricultural land may rely on GPS technology, but they are not the fundamental purpose of the system itself. Measuring water quality also does not fall under the GPS capabilities, as it involves different methods and instruments. By focusing on the satellite-driven location determination, one can appreciate how GPS supports various practices in agriculture, pest control, and environmental management effectively.