At minimum, how many GPS satellites are visible to any receiver on Earth at any given time?

A GPS receiver requires a minimum of four satellites to determine its position accurately in three-dimensional space (latitude, longitude, and altitude) using trilateration. Each satellite provides a signal with a time stamp, which allows the receiver to calculate its distance from each satellite based on the time it took for the signal to arrive. By receiving signals from at least four satellites, the receiver can not only determine its position but also correct for any time discrepancy between the satellites and the receiver.

While it's true that more satellites can enhance accuracy and reliability, the minimum necessary for a basic 3D positional fix is indeed four. Thus, stating that a minimum of six GPS satellites needs to be visible does not align with how GPS systems function. This understanding is crucial for properly working with GPS technology in mobile electronics.