What is the minimum number of satellites typically required for GPS operation?

The minimum number of satellites required for effective Global Positioning System (GPS) operation is typically 24. This number is crucial because the GPS system is designed to ensure that at least four satellites are in view from any point on Earth at any time. Having 24 satellites allows for a more robust coverage and the ability to perform trilateration efficiently.

Trilateration is the process by which a GPS receiver determines its position based on distances from multiple satellites. With a minimum of four satellites, the receiver can calculate its three-dimensional position (latitude, longitude, and altitude) and also accurately determine the time.

While having more than 24 satellites in the constellation enhances accuracy and redundancy, 24 is the baseline number required to ensure continuous and reliable GPS service. This is part of the reason why 24 is considered the minimum for proper functionality. Having fewer satellites would lead to potential gaps in coverage and accuracy in determining positions on Earth.