Satellite navigation is a geospatial technology that allows for the precise determination of a receiver's location on Earth's surface using signals transmitted from multiple orbiting satellites. The system functions by measuring the time delay between the transmission of a signal from a satellite and its reception by the ground unit. Because the velocity of electromagnetic waves is constant in a vacuum, measuring this time difference permits the calculation of the distance to the satellite. By establishing precise coordinates relative to at least four visible satellites, the receiver utilizes principles of trilateration to calculate three-dimensional position (latitude, longitude, and altitude). The accuracy of the system relies heavily on maintaining highly stable atomic clocks aboard the satellites and incorporating atmospheric corrections for signal propagation delays.