Why can GPS receivers receive satellite signals from almost anywhere on Earth?

GPS receivers can access signals from almost anywhere on Earth because the Global Positioning System utilizes a constellation of more than 24 satellites arranged in specific circular orbits. These orbits are strategically configured so that at least four to five satellites are in view from most locations on the planet at all times.123

The satellites transmit electromagnetic radiation pulses at precisely controlled times, which are generated by atomic clocks on board. By maintaining this constellation and ensuring continuous worldwide coverage, the system allows receivers—ranging from personal devices to aircraft and ships—to calculate their precise longitude, latitude, and altitude by measuring the signal travel time from multiple satellites. As the satellites orbit, their antennas are continuously oriented toward Earth’s center to ensure that navigation pulses are consistently directed toward users on the ground.312