How many satellites operate the GPS radio navigation system?

The Global Positioning System (GPS) is designed to be a reliable positioning and navigation system that utilizes a constellation of satellites. The correct answer reflects that the operational minimum for the GPS satellite constellation is 24 satellites. This number allows for global coverage, ensuring that at least four satellites are visible from any point on the Earth's surface at all times, which is essential for accurate positioning and timing information.

While more satellites than the minimum 24 can be in operation (and indeed, there are often more than 30 satellites actively providing signals), the system was initially set up with a minimum of 24 to ensure effective and continuous navigation services. This capability is crucial for various applications, from civilian navigation to military operations, thus emphasizing the importance of this baseline number in the functioning of GPS technology.