What is a space-based radio-navigation system consisting of satellites and ground stations called?

The correct answer is GPS, which stands for Global Positioning System. It is a space-based radio-navigation system that utilizes a constellation of satellites circling the earth, alongside a network of ground stations to ensure accurate positioning and timing information anywhere on the planet. The satellites communicate with receivers on the ground to determine the precise location through triangulation.

GPS is widely recognized and has become the standard for navigation globally, providing essential support for various applications including aviation, marine navigation, land surveying, and even personal devices like smartphones. Its reliance on satellite technology and ground control allows it to offer precise positioning functionality essential for various search and rescue operations.

The other systems mentioned, such as GLONASS, Galileo, and Beidou, are also space-based radio-navigation systems developed by Russia, the European Union, and China, respectively. Each operates on similar principles, but GPS remains the predominant navigation aid globally.